Publications #7 – «Drilling tool Bogomolov» — Mining tool for boreholes with square cross-section «Boring tool of Bogomolov»

Currently, at open mining more than 80 percents from the volume of rock mass are developed by drilling and blasting operations (DBO), which predetermine of the effectiveness of all subsequent processes for extraction and processing of minerals. In large open-cast mines DBO costs are up to 25-30 percents from the total cost of production and it’s expected to increase with the deepening of mining operations.

At the current time there are urgent tasks of the DBO:

1. Reduction of the specific charge of high explosive (HE).

2. Ensuring the quality of the established rock crushing.

3. Increasing the productivity of the drilling equipment.

Reducing of the charge of explosives can be achieved in several ways, namely:

1. Increasing in the borehole grid of explosive field;

2. Using another explosive with high value brisance.

Both of these methods lead to deterioration of crushing rock, and the second method leads to an increase in cost of explosives. Therefore, there are many ways to some extent a compromise solution of these problems. A team of scientists from the Kuzbass found one of those trade-offs, which is the use of blast holes with square cross-section [1].

Laboratory tests were carried out on three types of blasting holes: triangular, square and round cross-section of it. As a result, the optimum particle size of distribution of the blown unit was observed using boreholes with a square cross-section. Small yield of larger fractions indicates of best split materials [2].

In addition to laboratory tests the simulation of the explosion in the mountain range by the static loading of the walls well with a square and circular cross-section was made. Calculations were performed in the software package «T-flex analysis.» In the first case was seen loading the round holes with a diameter of 200 mm with an explosive grid 5×6 meters. In the second case is similar process with the size of 190mm square wells and explosive mesh 5,5h6 meters [3].

Based on the above studies-application-set square boreholes can on 10 percents:

1. increase the blasted rock mass;

2. increase the output of mined rock with a hole one meter;

3. increase the size of borehole grid;

4. reduce the consumption of explosives during blasting;

5. reduce the amount of drilling.

Because by holes with square cross-section are obtained such results, it was necessary to make the development of the tool [4]. For the prototype was taken series roller cone drill bit. Based on mathematical modeling was developed a unique form of cone through which the process of forming the hole with a square cross-section.

It was made a laboratory prototype of the two-cone bit with single-cone rolling cutter (Fig. 1).

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Fig. 1. The prototype of a rock bit for drilling a borehole with a square cross-section.

The test (Fig. 2), proved the possibility of forming of square cross-section of the borehole with the help of cutters with different length of the cone, was produced.

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Fig. 2. The bottom of the borehole with a square cross-section.

Roller cones forming a non-circular cross-section are smaller in diameter and operate in more severe conditions. To improve the centering of the bit during drilling, and reducing the load on the cutter, which perform shaping of drilling tool should be used in the form of roller cone bits and the expander (Fig. 3) in conjunction with advancing roller bits. Collapsible design reamer, with the ability to service and maintainability, and will increase the tool life.

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Fig. 3. Option of collapsible roller cone expander to form of square cross-section boreholes.

The result of the work was to obtain a new type of tool that can be used to obtain the borehole with square cross-section. This tool is called – «Boring tool of Bogomolov».

The range of modifications of developed tools:

1. Cutting-roller cone bits for the strength of the rocks on 6-9 of Protodyakonov’s scale;

2. Tricone bit for rock strength on 9-16 of Protodyakonov’s scale;

3. The two-cone expanders for the strength of rocks on 9-16 of Protodyakonov’s scale.

Advantages of the tool’s design for drilling of boreholes with square cross-section are:

— there are no analogues in the world of mechanical drilling of such boreholes for conditions of open-cast mines;

— field of application covers of large part of the spectrum of drilled rock strength in conditions of open-cast mines;

— this tool can be equipped with the most common domestic and foreign roller cone machines for drilling with purge as used rotary drilling method.

The advantage of using of the tool’s design is to expand the possibilities of increasing the efficiency of the explosion in order to reduce the cost of drilling and blasting operations, and environmental pollution.

A feasibility calculations based on the use of the drilling tool indicates the possibility of reducing the monthly cost of an explosive 10 percents and to achieve an annual economic impact in the operation of a drilling rig to about $ 138,340.

For the industrial development of this type of tool is required, we have an additional investment of $ 1.2 million [5]. Aimed at the industrial application of «Boring tool of Bogomolov» and obtain the following results:

1. Mining companies will have an innovative tool that will reduce the cost of mining.

2. Manufacturers will receive a product that will be in strong demand.

References

1. Drilling tool for stress-raiser well drilling — Access https://golovin2017.com/2015/08/16/drilling-tool-for-stress-raiser-well-drilling — Caps. from the screen.

2. Bogomolov, I.D. findings destruction of the array well drilling circle-Loy, triangular and rectangular shapes / I. D. Bogomolov A.M. Tsehin, M.K. Khusnutdinov // No-risk of vital activity of enterprises in coal regions: Materials of 4 Intern. Sc.-practical. Conf., November 21-23, 2000 — Kemerovo, 2000. — P. 89-90.

3. Resource-saving drilling tools appliance for noncircular cross-section wells forming — Access https://golovin2017.com/2015/09/01/resource-saving-drilling-tools-appliance-for-noncircular-cross-section-wells-forming — Caps. from the screen.

4. Preconditions for creating and using a tool for blastholes forming at the open cast mining — Access https://golovin2017.com/2015/08/16/preconditions-for-creating-and-using-a-tool-for-blastholes-forming-at-the-open-cast-mining — Caps. screen

5. Investment proposal «Drilling tool Bogomolov» — Access https://golovin2017.com/2015/09/20/investment-proposal-drilling-tool-bogomolov — Caps. screen

Source: Mining tool for boreholes with square cross-section «Boring tool of Bogomolov»

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

2. Preconditions for creating and using a tool for blastholes forming at the open cast mining

3. Drilling tool for stress-raiser well drilling

4. Appliance and development of drilling tools with noncircular cross-section

5. Resource-saving drilling tools appliance for noncircular cross-section wells forming

6. Investment proposal «Drilling tool Bogomolov»

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Publications #6 – «Drilling tool Bogomolov» — Investment proposal «Drilling tool Bogomolov»

The subject area of the project

Branch — mechanical engineering;

It specializes in the manufacture of drill bits for quarry machines rotary drilling;

The ultimate consumer of the finished product — mining enterprises of the coal industry, leading mining by open way.

Technical solution and product

«Drilling tool Bogomolov» is a kind of drilling tools designed for mining rotary drilling machines to obtain the blast hole of square cross-section.

Product line:

— Cutting roller bit for the fortress of rocks 6-9 on a scale Protodyakonov M.M.;

— Tricone rock bits for strength of rock 9-16 on the scale Protodyakonov M.M.;

— Dvohsotrichchya dilators for the fortress of rocks 9-16 on the scale Protodyakonov M.M.

Technical efficiency «Drilling tool Bogomolov»

— Increasing the volume of blasted rock mass by 10%;

— Increase the yield of rock mass per one meter of the well 10%;

— Increase the size of the well grid by 10%;

— Reduction of consumption of explosives in blasting operations at 10%;

— Reduction in drilling volumes by 10%.

Economic efficiency «Drilling tool Bogomolov»

— Decrease monthly costs for explosives by 10%;

— Reduce the cost of drilling and blasting operations at 7%;

— Annual economic effect when operating one drilling rig is $138345,86.

Intellectual property protection

Registered 8 intellectual property. In the further implementation of the project on all technical developments will be decorated patents for utility models and inventions.

Marketing project

The research carried out on the basis of which identified the following patterns of the market production in useful minerals by open method:

— 55% of coal in the world is extracted in the open way;

— 4325,6 million tons of coal were mined in the world in an open way in 2012;

— 251,8 million tonnes of coal was extracted in the open way on the territory of the Russian Federation in 2014;

— 60 thousand bits manufactured in the territory of the Russian Federation, mainly for the domestic market;

— $481 the average cost of a serial bit (size 215,9 mm);

— $962 average cost of «Drilling tools Bogomolov»;

— $0,03 billion of the total market volume serial drilling tool on the territory of the Russian Federation;

— $0,5 billion estimated the global market for serial drilling tool.

Changes in coal production is projected is not expected. Consequently level of sales of drilling tools will remain at the current level.

Implementation plan

The project is divided into the following stages:

Stage #1 — completed:

— Theoretical and laboratory evaluation of the effectiveness;

— Development of design documentation tool.

Stage #2 — 12 months:

— Production of pilot batch «Drilling tool Bogomolov»;

— A series of industrial tests;

— Completion of the construction.

Stage #3 — 12 months:

— Development of small-series production of the drilling tool;

— Development of an expanded product line.

Stage #4 — 12 months:

— Mastering of serial production «Drilling tool Bogomolov».

Business model

The project is possible with the creation of the «Technical innovation of engineering and cents».

The average number of staff your organization will be 7 employees.

Team to implement the project fully formed.

Monetization of the project:

1. Engineering services.

2. Licensing of manufacturers developed intellectual property.

Economic indicators

For realization of the project requires investment of funds in the amount $1178710. Distribution of investment according to the project stages are shown in table 1.

Table 1.

Investment plan ($)

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The revenue of the project is generated through licensing of manufacturers of drilling tools and engineering services. The planned volume of receipt of funds by years are presented in table 2.

Table 2.

Sales plan

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Table 3 summarizes the main technical and economic indicators of the project.

Table 3.

The main technical and economic indicators of the project

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When the financial model of interest rates on tax deductions taken under the Tax code of the Russian Federation.

The results of the project

With the introduction of industrial production «Drilling tool Bogomolov» will be received the following results:

— Mining companies will be innovative tool that will reduce from the absence of support for mineral extraction;

— The manufacturers will get the finished product that will have a steady demand.

Source: Investment proposal «Drilling tool Bogomolov»

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

2. Preconditions for creating and using a tool for blastholes forming at the open cast mining

3. Drilling tool for stress-raiser well drilling

4. Appliance and development of drilling tools with noncircular cross-section

5. Resource-saving drilling tools appliance for noncircular cross-section wells forming

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Publications #5 – «Drilling tool Bogomolov» — Resource-saving drilling tools appliance for noncircular cross-section wells forming

The main method of preparation to rock extraction is the blasthole drilling. Specific consumption of explosives and drilling rigs increase in productivity according to drilled rocks. Nowadays almost all blastholes at the open casts are drilled in cylindrical form. We suggest changing the form of the well – provide drilling with square cross-section.

Why for such goals the square wells usage is suggested?

The wells with noncircular cross-section are meant to decrease the specific consumption of explosives. It might cause the drilling rigs increase in productivity according to drilled rocks and specific consumption of explosives decreasing.

There exist and are applied different methods of blasthole drilling by the means of technological changes in blasting and drilling operations. There hasn’t been applied a method of stress-raiser usage at the well side in practice. We suggest using this method in order to decrease the off-gauge rock pieces output.

Test results confirm, that wells’ form changing leads to the alteration of blasted mass qualitative composition. The fraction distribution diagram shows that quantity of medium size pieces is larger in comparison to the triangular or circle wells. Therefore, there was designed a special tool with rollers and square cross-section.

Construction of the tool is based on the following principles:

1. Drilling and concentrator formation combination, that helps to avoid drilling technology changing.

2. Serial roller drilling rig usage.

There was produced a prototype of two roller bit with single-cone rolling cutter in conformity with scientific experimental data. Bit dimensions fit the rectangular cross section well with round corners, 160 mm diagonal and gear ratio equal to 2.

There were predrilled some wells using this tool, one of which is represented on pic.1.

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Рiс. 1 The view of initially predrilled well

As you can see on the picture – the well has a square form with round corners. It is a side view of the well.

Moreover, there was developed a drawing of cutting roller bit for noncircular cross section wells drilling.

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Pic. 2 Cutting roller bit

Two rollers installed on the lugs welded onto the bit base. The rollers have a form of gage edge and, as you can see from the picture, provide a square cross section of the well. Cutting unit with cutters (2) and spring supported (3) might move in the axial direction. Spring compression is regulated by the screw (4). Сжатие пружины регулируется гайкой 4. Cutting edges are allocated in such a way as to follow the roller profile and provide bottomhole destruction around the circle inside the cross section of the well, formed by the rollers.

There was made a research (using t-flex analysis program) into compression strain, which appears during the static load over sides of cylindrical wells and wells with noncircular cross section. Firstly, there were examined the circular wells with 200mm diameter and 5х6 well pattern. первом Secondly, there were examined 190 mm square wells with 5,5х6 well pattern. It may be concluded, that lager damage area in case of bigger well pattern and smaller dimensions is provided by square cross section wells.

There were made economic calculations of such wells and drilling tools productivity. Specific consumption of explosives qualitative decrease might be gained trough well pattern increasing, this also will cause drilling volume decreasing.

According to the index conditions of the drilling and blasting operations at the graphic log Berezovsckiy might be decreased up to 12,5 %, as well as drilling volumes, which might also decrease up to 12,5 %.

According to this data the economic calculations of drilling and blasting operations productivity were made. The drawing shows that expenses on drilling and blasting operations of wells with square cross section are lower in comparison to circular cross section wells.

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Pic. 3. Summary expenses on different types of drilling and blasting operations

Summary

1. There was suggested a drilling tool for square cross section wells, which might be applied to rock with 7-11 hardness. Noncircular cross section wells usage influences over drilling and blasting operations productivity at the open cast mining. It might cause drilling rig efficiency increasing and specific consumption of explosives decreasing.

2. There is required a production of bit prototypes in order to carry out drilling and blasting tests.

3. There is required a detailed research into square wells blasting for drilling and blasting parametric optimization and precise determination of economic potential.

4. There are required project investments.

Source: Resource-saving drilling tools appliance for noncircular cross-section wells forming

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

2. Preconditions for creating and using a tool for blastholes forming at the open cast mining

3. Drilling tool for stress-raiser well drilling

4. Appliance and development of drilling tools with noncircular cross-section

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Publications #4 – «Drilling tool Bogomolov» — Appliance and development of drilling tools with noncircular cross-section

At the Kuzbas current graphic log the average stripping ratio is 5,8 m3/ton, which means that for 1 ton of coal production almost 6 m3 of overburden rock has to be removed into the disposal area and, moreover, it has to be shattered before excavator loading. The main method of overburden rock destruction is blasthole drilling. Specific dust generation during blasting is changing from 0,04 kg to 0,154 kg of dust per 1 kg of blasted explosions, moreover, it leads to great volumes of toxic substances releasing – mainly carbonic oxide and nitrous oxides.

Thus, decreasing the powder factor is important not only because it will be economized. While the powder factor is decreasing, the quantity of blastholes is either decreasing. As a result, the volume of drilling is also decreasing and drilling rate increase requirements become not so strict.

Different methods are successfully applied in order to decrease the powder factor and increase the quality of rock shattering. Their main goal is to transmit the blast energy to as many rock volumes as possible. The energy is mainly expended on rocks crushing nearby the blastholes, because the great amount of energy is transmitted to the wells’ side during a short period of time. Therefore, increasing of gas (generated during the explosion) and rock contact area at the initial moment of the explosion is assumed to be reasonable.

Nowadays almost all blastholes at the open cast are bored in cylindrical form. However, if the well has, for example, a square or triangular cross section, then its lateral area per volume of blasting material in comparison to the circular one will be 12% and 27% bigger. Moreover, the angles, formed by the borehole walls matching, represent the concentrator of tension stress. As a result, there might be obtained predicted quantity and initial main crack propagation direction, where gas is delivered during the explosion, providing the piston type effect.

It has been established that during explosion of sandy-cement blocks and changing circular form of the borehole to the rectangular or flat form decreases the output of fine and oversized fractions.

There are well-known production tests of slot-like (flat) wells, that are formed by extension of cylindrical wells using burner-expander without thermodrill rotation, by parallel-coupled and parallel pulled-together wells drilling. Charge form changing has provided rock output increasing up to 25% while specific consumption of explosives has decreased up to 25 %. Middle size of spalls decreasing can be seen on the hard-wax, red and fire brick blocks after square and triangular wells blasting.

The results of such experiments verify that wells’ form changing provides changing of the blasted rock qualitative composition. Therefore, the main goal of researches is development and validation of drilling tools usage, which provides specific consumption of explosives decreasing with the purpose of energy saving and ecological environment pollution decreasing.

The analysis of patent information has shown that for drilling of wells with changed cross-section form is required the new type of drilling tool and machine. However, the usage of existing design of roller-bit drilling rig, combination of drilling and well forming is a rational decision. It might be implemented by means of rectangular, triangular wells drilling, that generate a stress-riser by means of their sides’ connection. Geometry analysis and kinematic analysis have revealed that in order to achieve this goal roller bit might be used for rectangular and triangular wells drilling, as a widely spread tool for blastholes drilling at the open-cast mining.

There was produced the prototype of two-roller bit with single-cone rolling cutter (pic. 2) in order to analyze the predrilling process. Predrilling (pic.1) of blocks with sand:cement ratio — 4:1 was carried out[3].

Defined well cross section forming is provided by rollers synchronous rolling and constant speed increasing ratio of the bit, which is achieved in the construction of perfect cone rollers. The rollers with a profile which is close to perfect cone are used for the harder rocks, because in this situation the bottomhole equipment sliding with shattering effect prevalence is minimal. However, the perfect cone rollers are not practically applied because of their support block small lifetime. That is the reason why there is suggested the usage of such rollers in roller cutting tools and slider bearings in support block of rollers.

The suggested drilling tool for forming of blastholes with noncircular cross-section has some significant distinctions and provides:

1. noncircular cross-section wells drilling with tool rotation and avoiding changes in widely spread technology of drilling at the open-cast mining;

2. series roller-bit drilling rig usage (almost 80% of wells at the open-cast mining are drilled using roller-bit drilling rigs);

3. wide range of rocks drilling according to the hardness, which enables to change up to 50% of roller bit types for blastholes drilling at the open casts with circular cross-section.

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Pic. 1. Prototype of square cross-section roller bit for well drilling

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Pic. 2 The view of initially predrilled well

Usage of suggested drilling tool for noncircular cross section wells drilling will provide noncircular cross-sectional wells bursting effect. As it has been previously mentioned – in some cases it might cause the decrease of explosive ratio up to 25 %. Moreover, drilling volumes might be reduced as well.

Source: Appliance and development of drilling tools with noncircular cross-section

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

2. Preconditions for creating and using a tool for blastholes forming at the open cast mining

3. Drilling tool for stress-raiser well drilling

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Publications #3 – «Drilling tool Bogomolov» — Drilling tool for stress-raiser well drilling

Dominating method of rock destruction at open-cast mining is explosive rupture, which has an explosion efficiency coefficient not exceeding several percents. This is almost the only existing method of destroying large volumes of rocks, blasting occupies up to 30 % of mineral resources production costs. Taking into consideration that shattering explosion efficiency coefficient doesn’t exceed a few percents, then development of applied blasting technologies (considering development of blasting science and technology) appear to be obvious.

It is well-known, that charge shape is crucial in terms of environmental influence and its final results. There exist practical researches into concentrated charge (with spherical symmetry) and slab charge (with noncircular cross-section). During sand-cement blocks blasting was revealed, that while changing from the circle form of the well to rectangular and flat the output of crushed fines and oversize fines is decreasing. There are well-known production tests of slot-like (flat) wells, that are formed by extension of cylindrical wells using burner-expander without thermodrill rotation, by parallel-coupled and parallel pulled-together wells drilling. Charge form changing has provided rock output increasing up to 25% while specific consumption of explosives has decreased up to 25 %. Middle size of spalls decreasing can be seen on the hard-wax, red and fire brick blocks after square and triangular wells blasting.

The results of such experiments verify that wells’ form changing provides changing of the blasted rock qualitative composition. It is arguable that in wells with polyangular cross-section such situation is caused by crack initiation and mainly in the angles intersection of wells sides.

Therefore, the main goal of researches is the development and validation of drilling tools usage, which provides specific consumption of explosives decreasing with the purpose of energy saving and ecological environment pollution decreasing.

For practical usage of wells with noncircular cross-section is required the bit, which should be technically as good as the ones well-known in the world practice. Patent information analysis has shown that for stress-raiser well drilling is essential production of the new type of drilling machines and that drilling methods can’t be effectively applied at the open-cast mining.

Shattering effect prevalence upon the bottomhole will be reasonable during drilling of medium-grained, fine-grained sandstone, conglomerates, hard limestone (with range of strength from 6 to 18 according to the Protodyakonov Rock Hardness Scale). For these conditions the rolling cutter bits will be sufficient (for medium-hard rock with layers hardness up to 9) and roller bits (for rocks with hardness from 6 to 18). The most common in practice are the roller bits, which are used for drilling of 80% wells at the open-cast mines. Therefore usage of existing design of roller-bit drilling rig, combination of drilling and stress riser forming is a rational decision.

It might be implemented by means of rectangular, triangular wells drilling. Geometry analysis and kinematic analysis have revealed that drilling rollers can be used for rectangular and triangular wells drilling.

Predrilling of blocks with sand:cement ratio — 4:1 was carried out. It has shown that rollers may rotate synchronously (pic. 1).

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Pic. 1. Well view

Rackbar of the bottomhole positively influences over noncircular cross-section well forming, because rollers should roll skidlessly and synchronously. For this purpose rollers should have a perfect cone (when tops of roller cone surface are allocated inside the well). The rollers with a profile which is close to perfect cone are used for the harder rocks, because in this situation the bottomhole equipment sliding with prevalence of shattering effect is minimal.

Therefore, in three-roller bits for square cross-section well drilling might be used features of rolling bits K, TK and partly T type. Noncircular cross-section form of the well is determined by a modified geometric shape of bit gauge rollers, that might be toothed, insert and insert-toothed, which means that they capture almost all rocks’ level of hardness for different types of bits. Synchronous movement of rollers provides decreasing of slipping and deterioration of equipment during hard and abrasive rock drilling. At the manufacturing plant in such bits may be used all significant achievements on the roller bit production sphere (oil-filled bearings, slide bearings, advanced materials).

Effectiveness of rolling cutter bit is caused by the following. Separate processing outline of the bottomhole might be used in the roller cutting bits . Peripheral part is processed by the rollers and the central one – by the cutting unit. Rock bit teeth, which are allocated at the bit crown, close to the top are less effective in destroying the rock because of the low peripheral speed and, therefore, lowest rock hit energy of the teeth. At the same time cutters, that are under peak radius, have the biggest sliding distance, which causes its deterioration densification. In such construction the leading part of the well is drilled by the cutting unit and rollers are expanding it up to the necessary diameter. In construction of rolling cutter rock bit for square cross-section well drilling might be used the previously mentioned advantages of such bits. Peripherical part of the bottomhole is destroyed by the rollers, that form noncircular profile, and the central part of the bottomhole is destroyed by the cutting unit, which has a lower deterioration. As cutting unit deteriorates, it might be replaced, because it is the cheapest part of the tool. Therefore, drilling tool is highly technically competitive with predeveloped and examined rolling cutter rock bit. Such bits are the alternative to type СТ and type С roller bits.

Introduction of such drilling tool would provide blasting effect for wells with noncircular cross-section, that (as it was previously mentioned) sometimes decreases specific consumption of explosives up to 25%. In this case the volumes of drilling are also decreasing. At the graphic log Berezovsckiy the rate of output per shift is 400 metres or 134 wells with average depth of 12 m. For example, if specific consumption of explosives is decreased up to 12,5 % during usage of wells with square cross-section, than on an equal footing will be required 117 wells, which is 12,5% less. Tool interchange is carried out after 3000 metres of drilling.

In this case, according to the economical analysis, the cost-cutting on explosives will be 17,4 million rubbles per year, even taking onto consideration the drilling tool rise in price and drilling rigs’ decline in productivity.

Therefore, expenses on drilling using wells with square cross-section are lower in comparison to the wells with circle cross-section. Suggested tool construction may develop the conditions of drilling and blasting operations and would lead to expenses decreasing.

Source: Drilling tool for stress-raiser well drilling

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

2. Preconditions for creating and using a tool for blastholes forming at the open cast mining

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Publications #2 – «Drilling tool Bogomolov» — Preconditions for creating and using a tool for blastholes forming at the open cast mining

Drilling and blasting operations are among main and essential processes of surface mining. Nowadays there exist many different methods of effective blast rock fragmentation improvement and moreover there are conducted researches on its development. The main goal of such researches is to decrease the explosive ratio, which provides reduction in expenses on blasting materials, as well as reduction in expenses on drilling, environmental pollution, seismic effect on the nearby environment.

Mostly energy is used for rock overgrinding nearby the blasthole, because well sides receive it in large amounts during a short period of time. There might be increased a duration of blasting materials in order to improve its effective using, as well as contacting area of blasting gas at the explosion starting moment might also be increased. However, the borehole diameter increasing will lead to borehole cross-section increasing and, as a result, needless additional drilling expenses. But if the borehole has, for example, a square or triangular (in the shape of equilateral triangle) cross-section, the area of the lateral surface of the well in the ratio to the volume of explosive materials, in comparison to the circle cross-section, will be greater by 12% and 27%. Moreover, the angles, formed by the borehole walls matching, represent the concentrator of tension stress. As a result, there might be obtained predicted quantity and initial main crack propagation direction, where gas is delivered during the explosion, providing the piston type effect.

Nowadays there exist a wide range of drill bit designs and sizes, which are used for blastholes mechanical drilling and usage of wells with circle cross-section has become a mature technology. It is determined by the requirement of simplicity and design reliability, as well as necessity of drilling tool rotation for mechanical energy transmission to the drill bits and diamond tools.

One of exceptions is the irrevocable percussion drilling method, which makes cross section of wells conformed to the tool shape. However the absence of tool rotation impede the hole-bottom region clearing out of drill cuttings, because rock cutting element has to be allocated all over the cross section of the borehole.

It is recommended to use drillbits with characteristics that conform mining and geological conditions and physico-mechanical properties of drilled rock in order to get better indices during the drilling. For this reason during practical application of wells with improved noncircular cross-section the new drillbit should be technically as good as drillbits, which are well-known in the global practice.

It is common knowledge that shattering effect prevalence upon the bottomhole will be reasonable during drilling of medium-grained, fine-grained sandstone, conglomerates, hard limestone (with range of strength from 6 to 18 according to the Protodyakonov Rock Hardness Scale). For these conditions rolling cutter bits will be sufficient (for medium-hard rock with layers hardness up to 9) and roller bits (for rocks with hardness from 6 to 18). The most common in practice are the roller bits, which are used for drilling of 80% wells at the open-cast mines. The harder the rock is the bigger shattering effect prevalence and the smaller cutting effect should be. The most effective type of bit (according to the scientific research and industrial tests) applied to rocks with alternating hardness of layers will be a combined rolling cutter bit.

In this article is suggested the usage of rotative bit with conical cutters, which forms a well with noncircular cross section. Unequal slant height of a cutters’ cone (Pic.1) causes unequal borehole diameter with explicit angles.

image

Pic. 1 Rolling bit for square cross-section well drilling

In suggested three-roller bits for square cross-section well drilling might be used features of rolling bits of K, TK and partly T type. The square cross-section form of the well is determined by a modified geometric shape of bit gauge rollers, that might be toothed, insert and insert-toothed, which means that they capture almost all rocks’ level of hardness for bit types with range of strength from 6 to 18 according to the Protodyakonov Rock Hardness Scale.

It is common knowledge that during rolling bit application at the bottomhole appears an edging, formed by the external bit crown with the greatest teeth spacing. Rackbar of the bottomhole positively influences over noncircular cross-section well forming, because rollers should roll skidlessly and synchronously. For this purpose the rollers should have a perfect cone (when tops of roller cone surface are allocated inside the well). In order to decrease rackbar’s negative impact on the deterioration process might be used constructive solutions for fractional damage of edging.

Nowadays drilling rollers with the perfect cone are not applied, because there is required an as big as possible bearing assembly in order to increase its durability. Contact voltage in rolling-contact bearing is up to 4000-5000 MPa and in sleeve bearing — 30-40 MPa.

That is why durability of bearings in such construction depends on high technology and development of bearings with larger slide area for low heat removal compensation, caused by rubbing part of the bearing.

Bearing rollers unloading is available only if they are forming a noncircular cross-section outline of the well, for example, in the construction of rolling cutter bit. Separate processing outline of the bottomhole might be used in the roller cutting bits. Peripherical part is processed by the rollers and the central one – by the cutting unit. Rock bit teeth, which are allocated at the bit crown, close to the top are less effective in destroying the rock because of the low peripheral speed and, therefore, the lowest rock hit energy of the teeth. At the same time cutters, that are under peak radius, have the biggest sliding distance, which causes its deterioration densification. In such construction the leading part of the well is drilled by the cutting unit and rollers are expanding it up to the necessary diameter.

During a well drilling using the combined bit the main role of bottomhole destroying belongs to the cutting unit, which is changed after deterioration. Partly the well is drilled jointly with the borehole processing using cutting and rolling tools. There are used different tools for bottom ole destruction depending on drilling conditions, which increases working capacity of rock-destroying unit. Moreover, the drilling is carried out at lower feeding pressure in comparison to the roller bit due to the joint impact of cutting tools and rollers. These all provides combined bit rollers unloading and increases its working capacity.

In suggested construction of rolling cutter rock bit for square cross-section well drilling might be used previously mentioned advantages of such bits. Peripherical part of the bottomhole is destroyed by the rollers, that form noncircular profile, and the central part of the bottomhole is destroyed by the cutting unit, which has a lower deterioration. As cutting unit deteriorates, it might be replaced, because it is the cheapest part of the tool. Therefore, drilling tool is highly technically competitive with predeveloped and examined rolling cutter rock bit. Such bits are the alternative to type СТ and type С roller bits and may drill rocks of medium hardness equal to 6 according to the Protodyakonov Rock Hardness Scale with hard rock layers.

The reserves of explosive action effectiveness increasing by means of wells’ cross-section form changing are not used during blasthole drilling at the open-cut mining. Mainly it is caused by the absence of drilling tool, which could compete with the noncircular cross-section well drilling bits. There are required the researches and industrial tests in the sphere of noncircular cross-section well drilling using rollers and blasting of such wells. Suggested in this article constructions have the following advantages:

· Might be based on the high and innovative technologies of bit drilling.

· Cover wide range of drilled rocks according to their hardness at the open-cut mining.

· Use rotary system of drilling and, therefore, might be applied to the most common Russian and foreign air blowing roller rigs.

· Provides technical-economic indicators improvement of rigs due to their construction development and development of bits’ construction and, moreover, through drilling volume decreasing.

Source: Preconditions for creating and using a tool for blastholes forming at the open cast mining

Archive of presentations

1. The efficiency of the blast hole with a square cross-section

2. The economic effect of using a blast hole with a non-circular cross-section

3. Square cross section wells forming

4. Development of modifications of the drilling tool for boreholes with a square cross-section

5. Intellectual property of the project

6. Investment proposal

7. Project team

8. Project «Drilling tool Bogomolov»

Publications archive

1. Effective appliance of drilled wells with noncircular cross-sectional area during mine stripping at the open cast

Thank you for your cooperation and understanding

Igor Golovin

Phone: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Drilling tool Bogomolov»

Публикация №7 — «Буровой инструмент Богомолова» — Горный инструмент для получения скважин квадратного поперечного сечения – «Буровой инструмент Богомолова»

В настоящее время на открытых горных разработках более 80% объемов горных пород разрабатывается с применением буровзрывных работ (БВР), предопределяющих эффективность всех последующих технологических процессов добычи и переработки полезного ископаемого. На крупных карьерах затраты на БВР достигают 25% — 30% от общих затрат на добычу полезных ископаемых. По мере углубления карьера, требования к буровзрывным работам возрастают.

На текущий момент времени стоят актуальные задачи при проведении БВР:

1. Уменьшение удельного расхода взрывчатого вещества (ВВ).

2. Обеспечение установленного качества дробления горных пород.

3. Увеличение производительности бурового оборудования.

Уменьшение расхода ВВ можно достичь несколькими способами, а именно:

1. увеличением сетки скважин взрывного поля;

2. использованием другого взрывчатого вещества с повышенным значением бризантности.

Оба данных способа ведут к ухудшению качества дробления горных пород, а второй способ ведет к увеличению затрат на ВВ. Поэтому разрабатываются и существуют множество способов в той или иной степени компромиссного решения указанных задач. Группа ученых из Кузбасса нашла одно из таких компромиссных решений, которое заключается в применении взрывных скважин квадратного поперечного сечения [1].

Были произведены лабораторные испытания по взрыванию трех видов скважин: с треугольным, квадратным и круглым поперечным сечением. В результате оптимальный грансостав взорванного блока наблюдался при использовании скважин с квадратным поперечным сечением. Небольшой выход более крупных фракций, свидетельствует о лучшем дроблении материалов [2].

В дополнении к лабораторным испытаниям было произведено моделирование процесса взрыва в горном массиве путем статического нагружения стенок скважин с квадратным и круглым поперечным сечением. Расчеты были выполнены в программном комплексе «T-flex анализ». В первом случае рассматривалось нагружение круглых скважин диаметром 200 мм со взрывной сеткой 5х6 метров. Во втором случае рассматривался аналогичный процесс с квадратными скважинами размером 190мм и взрывной сеткой 5,5х6 метров [3].

На основании указанных выше проведенных исследований применение взрывных скважин квадратного сечения может на 10%:

1. Увеличить объем взорванной горной массы;

2. Увеличить выход горной массы с одного метра скважины;

3. Увеличить размеры сетки скважин;

4. Уменьшить расхода взрывчатых веществ при буровзрывных работах;

5. Уменьшить объемы бурения.

Поскольку за счет скважин квадратного поперечного сечения достигаются подобного рода результаты, необходимо было произвести разработку данного инструмента [4]. За прототип было взято серийное шарошечное буровое долото. На основании математического моделирования была разработана уникальная форма шарошки с помощью которой происходит процесс формообразования скважины с квадратным поперечным сечением.

Был изготовлен лабораторный опытный образец двухшарошечного долота с одноконусными шарошками (рис. 1).

clip_image002

Рис. 1. Опытный образец шарошечного долота для бурения скважины с квадратным поперечным сечением.

Произведены испытания (рис. 2), доказавшие возможность формирования квадратного поперечного сечения скважины с помощью шарошек с разной длиной образующей конуса.

image

Рис. 2. Забой скважины с квадратным поперечным сечением.

Шарошки, формирующие некруглое поперечное сечение, имеют меньшие размеры в диаметре и работают в более сложных условиях. Для улучшения центрирования долота в процессе бурения и снижения нагрузки на шарошки, которые выполняют формообразование скважины, целесообразно использовать буровой инструмент в виде режуще-шарошечного долота и расширителя (рис. 3) в сочетании с опережающим шарошечным долотом. Разборная конструкция расширителя, благодаря возможности обслуживания и ремонтопригодности, также позволит увеличить ресурс инструмента.

image

Рис. 3. Вариант разборного шарошечного расширителя для образования скважин квадратного поперечного сечения.

Результатом работ стало получение нового вида инструмента, с помощью которого можно получать скважины квадратного поперечного сечения. Данный инструмент назван — «Буровым инструментом Богомолова».

Номенклатура модификаций разработанного инструмента:

1. Режуще шарошечные долота для крепости пород 6-9 по шкале Протодъяконова М. М.

2. Трехшарошечные долота для крепости пород 9-16 по шкале Протодъяконова М. М.

3. Двухшарошечные расширители для крепости пород 9-16 по шкале

Протодъяконова М. М.

Преимуществом конструкции горного инструмента для получения скважин квадратного поперечного сечения является:

1. Отсутствие в мире аналогов по механическому бурению скважин с некруглым поперечным сечением для условий карьеров;

2. Область применения охватывает большую часть спектра буримых пород по крепости на карьерах;

3. Инструментом могут быть оснащены наиболее распространенные отечественные и зарубежные шарошечные станки для бурения с продувкой, так как используется вращательный способ бурения.

Проведенные технико-экономические расчеты с учетом использования данного бурового инструмента свидетельствую о возможности уменьшения ежемесячных затрат на взрывчатое вещество на 10% и достижения годового экономического эффекта при эксплуатации одного бурового станка порядка $138340.

Для промышленного освоения данного вида инструмента необходимы дополнительные инвестиции в размере $1,2 миллиона долларов [5]. Направленные на внедрение в промышленное производство «Бурового инструмента Богомолова» и получения следующих результатов:

1. Горные предприятия получат инновационный инструмент, который позволит снизить издержки на добычу полезных ископаемых.

2. Заводы-изготовители получат продукт, который будет пользоваться стабильным спросом.

Литература

1. Drilling tool for stress-raiser well drilling — Access https://golovin2017.com/2015/08/16/drilling-tool-for-stress-raiser-well-drilling — Caps. from the screen.

2. Богомолов, И. Д. Результаты исследования разрушения массива бурением скважин круг-лой, треугольной и прямоугольной форм / И. Д. Богомолов, А. М. Цехин, М. К. Хуснутдинов // Без-опасность жизнедеятельности предприятий в угольных регионах: Материалы 4 Междунар. науч.-практ. конф., 21-23 ноября 2000 г. – Кемерово, 2000. – С. 89-90.

3. Resource-saving drilling tools appliance for noncircular cross-section wells forming — Access https://golovin2017.com/2015/09/01/resource-saving-drilling-tools-appliance-for-noncircular-cross-section-wells-forming — Caps. from the screen.

4. Preconditions for creating and using a tool for blastholes forming at the open cast mining — Access https://golovin2017.com/2015/08/16/preconditions-for-creating-and-using-a-tool-for-blastholes-forming-at-the-open-cast-mining — Caps. screen

5. Investment proposal «Drilling tool Bogomolov» — Access https://golovin2017.com/2015/09/20/investment-proposal-drilling-tool-bogomolov — Caps. screen

Источник: https://golovin2017.com/2015/11/30/mining-tool-for-boreholes-with-square-cross-section-boring-tool-of-bogomolov/

Архив презентаций

1. Эффективность взрывных скважин с квадратным поперечным сечением

2. Экономический эффект от использования квадратных взрывных скважин

3. Формообразование скважин с квадратным поперечным сечением

4. Разработка модификаций
«Бурового инструмента Богомолова
»

5. Интеллектуальная собственность проекта

6. Инвестиционное предложение

7. Команда проекта

8. Проект «Буровой инструмент Богомолова»

Архив публикаций

1. Публикация №1 — «Буровой инструмент Богомолова» — Об эффективности применения скважин с некруглым поперечным сечением при вскрышных работах на карьерах

2. Публикация №2 – «Буровой инструмент Богомолова» — Предпосылки по созданию и использованию инструмента для получения взрывных скважин на открытых горных работах

3. Публикация №3 — «Буровой инструмент Богомолова» — Буровой инструмент для бурения скважин с концентраторами напряжений

4. Публикация №4 — «Буровой инструмент Богомолова» — О применении и разработке инструмента для получения скважин с некруглым поперечным сечением

5. Публикация №5 — «Буровой инструмент Богомолова» — Применение ресурсосберегающего бурового инструмента для получения скважин с некруглым поперечным сечением

6. Публикация №6 — «Буровой инструмент Богомолова» — Инвестиционное предложение «Буровой инструмент Богомолова»

Спасибо за сотрудничество и понимание,

Игорь Головин

Тел.: +7-921-435-13-44

E-mail: golovin-2017@yandex.ru

«Буровой инструмент Богомолова»