CN204419145U - Coal seam liquid carbon dioxide fracturing device - Google Patents
Coal seam liquid carbon dioxide fracturing device Download PDFInfo
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- CN204419145U CN204419145U CN201420858542.8U CN201420858542U CN204419145U CN 204419145 U CN204419145 U CN 204419145U CN 201420858542 U CN201420858542 U CN 201420858542U CN 204419145 U CN204419145 U CN 204419145U
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- sealing
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- fracturing
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Abstract
The utility model discloses a kind of coal seam liquid carbon dioxide fracturing device, this device comprises for providing liquid CO
2feeding unit, fracturing pump, hole packer, the first pipeline and second pipe; Described hole packer is for being placed on the hole packer treated in pressure break coal bed drilling, comprise Grouting Pipe, the first sealing of hole capsule, the second sealing of hole capsule and pressure break pipe, one end of Grouting Pipe and one end of pressure break pipe are all fixed on the first sealing of hole capsule through the first sealing of hole capsule, the other end of pressure break pipe passes the second sealing of hole capsule and is fixed on the second sealing of hole capsule, and the other end of Grouting Pipe is between the first sealing of hole capsule and the second sealing of hole capsule.The utility model can make increase in production, improves coal seam permeability and lump coal output capacity.
Description
Technical field
The utility model relates to Coal Mining Technology field, belongs to coal mine downhole safety exploitation, especially coal seam liquid carbon dioxide fracturing device and method.
Background technology
China's coal-mine mainly adopts pit mining, and mining conditions is complicated, and operating environment is severe, Flood inducing factors is many, and particularly low-permeable and mechanical mining, gas pumping, dust prevention and control etc. containing hard dirt band (tuberculosis) coal seam are difficult to obtain and produce effects.Coal body permeability depend primarily on medium porosity, underbead crack geometric properties, fracture fractal dimension, inner stress-strain state and pore pressure etc., these are considered to the principal element affecting coal body permeability, wherein first three is direct factor, and stress-strain state and pore pressure affect permeability by change rock interior hole and crack.The comprehensive compression of coal body in the past and permeability achievement in research, can obtain Fig. 1 a Fig. 1 b.Fig. 1 a is stress in coal bed-strain curve (OA, AB, BC, CD, DE, EF represent densification, elasticity respectively, stable to break, astablely break, macroscopic failure, residual strength stage), and Fig. 1 b is corresponding stress in coal bed-permeability curve.
Through research and practice for many years; fracturing and blast cracking technology are the effective ways of the anti-reflection or pre-profit in coal seam; though the overall release of energy is anti-reflection; the gas permeability in raising coal seam to a certain degree and percentage of damage; but it is poor for applicability, complex process, guard space not enough; workload is large, the more important thing is that these measures are little at the unload effects radius in coal seam.Be embodied in: hydraulic fracturing technology carrys out pressure break coal (rock) layer by force (forcing) pump fracturing fluid press-in boring, this kind of mode is due to pump delivery and the restriction of its process characteristic, its pressure rise time is oversize, loading velocity is slow, and surge pressure is low, so can only form the crackle in a vertical minimum principal stress direction, this crackle is easy to expand along primary Weak face, not easily generate the new crackle perpendicular to aspect, crackle is not easily communicated with each other, therefore significantly can not increase the gas permeability of coal.Even if water under high pressure can pressure break coal body, along with the increase of crack's volume, of the fracturing fluid pressure also constantly reduces, rapid loss pressure break action potency.Fracturing propping agents ratio is also difficult to control in addition, and distribute also uneven, the hydrophily of coal etc. also can affect the gas permeability in coal seam, and its fracturing unit is complicated, and cost is also high, therefore is not suitable for raising drawing-off gas.Blast cracking technology is that colliery need be placed in boring with safety explosive or high explosive, explosion is implemented with stemming shutoff, this mode pressure rise time is short, surge pressure is high, countless short seam can be produced, but because its blast pressure is far above the yield strength of country rock, cause the serious fragmentation of drill hole wall to be collapsed, form residual pressure district " stress cage ", thus reduce permeability.Other waterpower extruding measure, comprising: hydrodynamic behavior, is positioned at the release drainage beyond extending stress band, is applicable to cherry coal, anti-reflection by loosening coal mass relief, can not explain by fracturing principle; Hydraulic slotted liner technique, anti-reflection by high-pressure water jet slot release in coal body; High pressure water injection, is similar to fracturing, but water injection pressure and water injection rate limited, large crack can not be opened or crack is effectively extended, link up.
Open about liquid CO up to now
2the utility model of pressure break aspect (CN 102011574 A, CN 102031106 A, CN 102168550 A, CN 102852508 A) is all for oil exploitation or shale gas exploitation, and obtain application in some enterprises, but do not see about the application of coal mining field and related process.
Utility model content
The utility model provides a kind of coal seam liquid carbon dioxide fracturing device, can make increase in production, improves coal seam permeability and lump coal output capacity.
The technical solution of the utility model is as follows:
Coal seam liquid carbon dioxide fracturing device, its special character is: comprise for providing liquid CO
2feeding unit, fracturing pump, hole packer, the first pipeline and second pipe;
Described hole packer is for being placed on the hole packer treated in pressure break coal bed drilling, comprise Grouting Pipe, the first sealing of hole capsule, the second sealing of hole capsule and pressure break pipe, one end of Grouting Pipe and one end of pressure break pipe are all fixed on the first sealing of hole capsule through the first sealing of hole capsule, the other end of pressure break pipe passes the second sealing of hole capsule and is fixed on the second sealing of hole capsule, and the other end of Grouting Pipe is between the first sealing of hole capsule and the second sealing of hole capsule;
Described fracturing pump comprises fracturing fluid entrance and fracturing fluid outlet, and described feeding unit is communicated with fracturing fluid entrance by the first pipeline, and fracturing fluid outlet is communicated with the pressure break pipe being fixed on the first sealing of hole capsule place by second pipe;
Described second pipe is provided with one way valve and threeway, and one way valve is between fracturing fluid outlet and threeway;
The Grouting Pipe termination being fixed on the first sealing of hole capsule place is provided with note/plasma discharge mouth.
CO is provided with near the extension of the pressure break pipe of the second sealing of hole capsule
2release aperture.
Above-mentioned CO
2release aperture has 5, adjacent C O
2the spacing of release aperture is 1m.
Above-mentioned first pipeline is provided with flow meter.
Above-mentioned fracturing pump is the liquid CO of explosion-proof type that pressure and flow can regulate
2fracturing pump.
Above-mentioned feeding unit is provided with liquid turnover valve, atmospheric valve, gas turnover valve, safety valve, survey full valve, pressure meter, pressurizing valve and content gauge.
Above-mentioned feeding unit is tank car or tank body, and the first pipeline and second pipe are flexible pipe.
The utility model has following technique effect:
CO2 gas-liquid two-phase conversion and cycle continues to increase pressure break energy, realizes good fracturing effect.Liquid CO
2inject coal bed drilling, a part of expanded by heating vaporization in fracturing process, make frac pressure continue to increase, pressure break crack is able to continuous extension; Along with CO
2the increase of vaporization caloric receptivity, operative liquid CO
2change solid dry ice into, enter crack and play proppant effect, prevent the closed of pressure break crack, and of the fracturing fluid three-state cycle transforms and promotes that frac pressure continues to increase and make pressure break crack scope constantly be expanded, until fracturing fluid majority is converted into gaseous state, or free state exists with cracks in coal seam or competitive Adsorption in coal seam.
Further, CO
2coal seam reservoirs is entered, CO as fracturing fluid
2be dissolved in water, and react with water and generate weakly acidic carbonic acid, this reaction can reduce of the fracturing fluid pH value, effectively prevent the expansion of coal seam CLAY MINERALS AND THEIR SIGNIFICANCE, decreases the injury of fracturing fluid formation, and then improves the permeability of coal seam reservoirs.
Meanwhile, the liquid CO in coal seam
2coal bed fracturing technique is simple relative to fracturing, has good cooling-down effect to coal seam simultaneously, and promotes coal seam CH
4the advantages such as desorb.It is large or there is the pressure break in scleroma core or dirt band coal seam that this technology and technique not only can be used for hardness factor, but also can be used for stone door punching coal protrusion-dispelling, improves the effects such as the Drained rate of coal-bed gas.
Inspection hole CO
2concentration monitor: CO is carried out to the inspection hole of pressure break both sides
2, mainly (in the inspection hole of detective distance certain length, there is CO to monitor fracturing effect in concentration monitor
2time, just can judge that pressure break crack has reached the depth requirements of construction, can terminate pressure break).
The object of sealing of hole: adopt the form of two sealing of hole capsule+sealing of hole slurries to carry out sealing of hole, object is the CO in pressure break hole
2carry out pressurize (making the pressure in pressure break hole can continue to raise), be unlikely to CO time pressure raises
2overflow in hole, the operating personnel of surrounding is damaged.
Accompanying drawing explanation
Fig. 1 a is stress in coal bed-strain curve figure;
Fig. 1 b is the stress in coal bed-permeability curve corresponding with Fig. 1 a;
Fig. 2 is the liquid CO in the utility model coal seam
2the layout schematic diagram of boring;
Fig. 3 is the liquid CO in the utility model coal seam
2fracturing device system layout schematic diagram;
Fig. 4 is the hole sealing structure schematic diagram of the utility model boring;
Fig. 5 is the utility model inspection hole arrangement schematic diagram.
1-goaf; 2-stope; 3-is for mining face; 4-holes; The adjacent goaf of 5-; 6-protection pillar; 7-feeding unit (liquid CO
2tank car); 8-flow meter; 9-first pipeline; 10-pressure meter; 11-fracturing pump; 12-one way valve; 13-threeway; 14-air discharge cook; 15-note/plasma discharge mouth; 16-snap joint; 18-pressure break coal seam; 19-first sealing of hole capsule; 20-second sealing of hole capsule; 21-Grouting Pipe; 22-pressure break pipe; 23-sealing of hole slurries; 24-CO
2release aperture; 26-inspection hole; A-sealing of hole section; B-fracturing section.
Detailed description of the invention
The utility model provides a kind of coal seam liquid carbon dioxide fracturing device, comprises for providing liquid CO
2feeding unit 7, fracturing pump 11, hole packer, the first pipeline 9 and second pipe;
Hole packer is for being placed on the hole packer treated in pressure break coal bed drilling, comprise Grouting Pipe 21, first sealing of hole capsule 19, second sealing of hole capsule 20 and pressure break pipe 22, one end of Grouting Pipe and one end of pressure break pipe are all fixed on the first sealing of hole capsule through the first sealing of hole capsule, the other end of pressure break pipe passes the second sealing of hole capsule and is fixed on the second sealing of hole capsule, and the other end of Grouting Pipe is between the first sealing of hole capsule and the second sealing of hole capsule;
Fracturing pump comprises fracturing fluid entrance and fracturing fluid outlet, and feeding unit is communicated with fracturing fluid entrance by the first pipeline, and fracturing fluid outlet is communicated with the pressure break pipe being fixed on the first sealing of hole capsule place by second pipe;
First pipeline is provided with flow meter 8; Second pipe is provided with one way valve 12 and threeway 13, and one way valve is between fracturing fluid outlet and threeway;
The Grouting Pipe termination being fixed on the first sealing of hole capsule place is provided with note/plasma discharge mouth 15.In boring, pressure break pipe can adopt the high-quality seamless steel pipe of wall thickness 5mm.
CO is provided with near the extension of the pressure break pipe of the second sealing of hole capsule
2release aperture, CO
2release aperture has 5, adjacent C O
2the spacing of release aperture is 1m.
Fracturing pump is the liquid CO of explosion-proof type that pressure and flow can regulate
2fracturing pump.
Feeding unit is provided with liquid turnover valve, atmospheric valve, gas turnover valve, safety valve, survey full valve, pressure meter 10, pressurizing valve and content gauge.
It is tank car or tank body that feeding unit can be selected, and the first pipeline and second pipe are flexible pipe, and the first pipeline also can select the high pressure resistant cryogenic hose of internal diameter 1 cun.
The liquid CO in coal seam based on coal seam of the present utility model liquid carbon dioxide fracturing device
2fracturing process, comprises the following steps:
Step 1, boring: employing drilling tool carries out drilling in coal bed fracturing position and obtains boring 4, and the both sides of each boring are also drilled with one or more inspection hole 26;
Step 2, sealing of hole: the first sealing of hole capsule and the second sealing of hole capsule are advanced in boring, there is space in the bottom of the second sealing of hole capsule and boring, Grouting Pipe and pressure break pipe are fixed by the annexation of the utility model coal seam liquid carbon dioxide fracturing device respectively simultaneously, and airtight connection between each pipeline, by injecting sealing of hole slurries in the space of Grouting Pipe between two sealing of hole capsules;
Step 3, pressure break: in the boring of step 1, pass into CO by pressure break pipe by feeding unit
2, passing into CO
2process in, the pressure of fracturing pump is progressively raised to coal seam implement pressure break;
Step 4, monitoring: the CO in the inspection hole of monitoring boring both sides
2concentration, can monitor CO
2to the pressure break effect of radius scope in coal seam, and then fracturing effect is monitored, Real-Time Monitoring is carried out to operating area environment simultaneously;
Step 5, pressure release: after pressure break terminates, by the pressure-emptying in each pipeline, discharge sealing of hole slurries, reclaim fracturing device.
Wherein, the boring in step 1 and inspection hole are positioned at same level height;
In step 3 during pressure testing, the pressure test pressure of fracturing pump is more than or equal to the rated pressure of pump, and in pressure testing process, the running time running coal seam liquid carbon dioxide fracturing device is no less than 10min;
In step 3 during pressure break, stop pressure injection when the pump pressure of fracturing pump is increased to the rated pressure of fracturing pump, the dwell time is no less than 1 hour.
Below in conjunction with accompanying drawing, the utility model will be further described:
With liquid CO
2as pressure break medium, in employing, press storage tank by liquid CO
2be transported to down-hole, application carbon dioxide booster pump injection enters boring, the CO in boring after gasification
2volume expansion is boosted, and realizes the safe pressure break in coal seam.Detailed description of the invention is as follows:
The liquid CO in coal seam
2fracturing device is by liquid CO
2tank car, fracturing pump, pressure break pipe, hole packer, monitoring instrument the first pipeline and the composition such as second pipe and accessory.Liquid CO
2tank car provides fracturing fluid for whole fracturing process, and fracturing pump is as the power facility liquid towards CO of fracturing process
2boost, enter pressure break pipe by high pressure resistant cryogenic pipe and be delivered to and carry out fracturing work with the boring of special hole packer shutoff to coal seam, fracturing process carries out Real-Time Monitoring to coal seam and operating area environment.
Liquid CO
2tank car can select CPW-2.0 mining mobile liquid carbon dioxide storage tank, select dischargeable capacity to be the horizontal tank of 1.2L or 2.0L, storage tank is provided with liquid turnover valve, atmospheric valve, gas turnover valve, safety valve, survey full valve, pressure meter, pressurizing valve, content gauge etc.
Fracturing pump selects the adjustable liquid CO of pressure, flow
2fracturing pump, range of flow 5-6000L/h, inlet pressure ranges is at the mining explosion-proof type high pressure low temperature booster pump of 5 ~ 30MPa.
First pipeline and second pipe, can select the high pressure resistant cryogenic hose of internal diameter 1 cun, its anti-pressure ability is greater than 40Mpa, and termination connects snap joint.
As Fig. 2, along the position of center line of bearing in stope twice coal seam, to coal seam, inner construction drill depth H, spacing of wells L, aperture are respectively the boring of D, and its parameter is determined by coal bed texture type, coal seam thickness and face length parameter.
As Fig. 5, to construct respectively two inspection holes at the isometry position with boring both sides, the position of two inspection holes distances boring is respectively L1 and L2, and the degree of depth of two inspection holes is equal to drilling depth.
As Fig. 4, hole packer adopts double-capsule hole packer, sealing of hole capsule is advanced into sealing of hole section, Grouting Pipe and pressure break pipe are placed in sealing of hole simultaneously, aperture is encapsulated stifled equally with hole sealing glue, grouting pump is connected with the slip casting mouth of pipe, sealing of hole slurries 23 are injected to sealing of hole section (between two sealing of hole capsules).In boring, pressure break pipe adopts wall thickness 5mm high-quality seamless steel pipe.
Hole packer sealing of hole intensity must be greater than the maximum recoil strength produced in fracturing process.Maximum recoil strength is calculated as follows:
F
max＝0.25πD
2p×10
-3
In formula: F
max---maximum recoil strength, kN;
D---bore diameter, mm;
P---the rated pressure of CO2 fracturing pump, MPa;
As Fig. 3, the liquid CO of CPW-2.0 mining mobile liquid carbon dioxide storage tank will be loaded with
2tank car liquid outlet is by being connected with the fracturing fluid entrance of pressure break pump truck by the high pressure resistant cryogenic hose of internal diameter 1 cun, and fracturing pump outlet is connected in the snap joint of pressure break pipe by second pipe.Air discharge cook 14 is installed in the exit being arranged on the threeway on second pipe.When using the utility model device, using mining portable carbon dioxide overload alarm instrument, being used for testing environment gas concentration lwevel.
First must carry out pressure testing when coming into effect fracturing operation, pressure test pressure must reach the rated pressure of pump, and keeps this pressure to be no less than 10min running time.Then open liquid CO 2 tank car liquid outlet valve, start fracturing pump and start to carry out coal bed fracturing operation, stop pressure injection when pump pressure is increased to the rated pressure 10MPa of pump gradually, the dwell time is no less than 1 hour.Fracturing process carries out in strict accordance with FRACTURING DESIGN, Real-Time Monitoring pump group operating condition, record pressure and data on flows.Detect the CO2 concentration in two inspection holes of boring both sides, CO2 is to the pressure break effect of radius scope in coal seam in monitoring simultaneously.
Open the air discharge cook in threeway after fracturing operation completes, to boring pressure release, simultaneously by each pressure duct emptying, discharge sealing of hole slurries, reclaim fracturing device, aforesaid operations is carried out to next one boring.
Distribution of boreholes in step the utility model is on the length direction in stope front, coal seam.
The boring of Splitting Method and fracturing work can all in stope drift active workings or heading end place carry out.
Operating principle of the present utility model:
The utility model is with liquid CO
2as pressure break medium, in employing, press storage tank by liquid CO
2be transported to down-hole, application carbon dioxide booster pump injection enters boring, the CO in boring after gasification
2volume expansion is boosted, cause crack plane of weakness to be expanded under pressure effect in producing wall in the plane of weakness of crack, extend, so that generation connection is through each other, form the through Fracture Networks be interweaved, realize large to seam hardness coefficient and containing the safe pressure break in hard dirt band (tuberculosis) coal seam, increase the cranny development in coal seam, reach the object improving coal seam permeability, increase in production and raising lump coal output capacity.
Protection domain of the present utility model is not limited to detailed description of the invention of the present utility model, and under the prerequisite not departing from utility model design, any deduction do the utility model or alternative, all should be considered as belonging to protection domain of the present utility model.
Claims (7)
1. coal seam liquid carbon dioxide fracturing device, is characterized in that: comprise for providing liquid CO
2feeding unit, fracturing pump, hole packer, the first pipeline and second pipe;
Described hole packer is for being placed on the hole packer treated in pressure break coal bed drilling, comprise Grouting Pipe, the first sealing of hole capsule, the second sealing of hole capsule and pressure break pipe, one end of Grouting Pipe and one end of pressure break pipe are all fixed on the first sealing of hole capsule through the first sealing of hole capsule, the other end of pressure break pipe passes the second sealing of hole capsule and is fixed on the second sealing of hole capsule, and the other end of Grouting Pipe is between the first sealing of hole capsule and the second sealing of hole capsule;
Described fracturing pump comprises fracturing fluid entrance and fracturing fluid outlet, and described feeding unit is communicated with fracturing fluid entrance by the first pipeline, and fracturing fluid outlet is communicated with the pressure break pipe being fixed on the first sealing of hole capsule place by second pipe;
Described second pipe is provided with one way valve and threeway, and one way valve is between fracturing fluid outlet and threeway;
The Grouting Pipe termination being fixed on the first sealing of hole capsule place is provided with note/plasma discharge mouth.
2. coal seam according to claim 1 liquid carbon dioxide fracturing device, is characterized in that: be provided with CO near the extension of the pressure break pipe of the second sealing of hole capsule
2release aperture.
3. coal seam according to claim 2 liquid carbon dioxide fracturing device, is characterized in that: described CO
2release aperture has 5, adjacent C O
2the spacing of release aperture is 1m.
4. coal seam according to claim 3 liquid carbon dioxide fracturing device, is characterized in that: described first pipeline is provided with flow meter.
5. coal seam according to claim 4 liquid carbon dioxide fracturing device, is characterized in that: described fracturing pump is the liquid CO of explosion-proof type that pressure and flow can regulate
2fracturing pump.
6. coal seam according to claim 5 liquid carbon dioxide fracturing device, is characterized in that: described feeding unit is provided with liquid turnover valve, atmospheric valve, gas turnover valve, safety valve, survey full valve, pressure meter, pressurizing valve and content gauge.
7. coal seam according to claim 6 liquid carbon dioxide fracturing device, is characterized in that: described feeding unit is tank car or tank body, and the first pipeline and second pipe are flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858542.8U CN204419145U (en) | 2014-12-29 | 2014-12-29 | Coal seam liquid carbon dioxide fracturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858542.8U CN204419145U (en) | 2014-12-29 | 2014-12-29 | Coal seam liquid carbon dioxide fracturing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204419145U true CN204419145U (en) | 2015-06-24 |
Family
ID=53469527
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420858542.8U Expired - Fee Related CN204419145U (en) | 2014-12-29 | 2014-12-29 | Coal seam liquid carbon dioxide fracturing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN204419145U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
| CN105332684A (en) * | 2015-11-13 | 2016-02-17 | 重庆大学 | High-pressure water burst and CO2 fracturing combined coal bed gas displacement extraction technology |
| CN107461185A (en) * | 2017-10-09 | 2017-12-12 | 中国矿业大学(北京) | A kind of new fracturing drainage from coal seam coal seam device of air |
| CN107725102A (en) * | 2017-11-06 | 2018-02-23 | 贵州工程应用技术学院 | A kind of water under high pressure and dry ice synergy permeability improvement device and method |
| CN110487137A (en) * | 2019-08-27 | 2019-11-22 | 山东科技大学 | A kind of deep hole presplitting water coincidence blast charging structure and construction method |
| CN112115599A (en) * | 2020-09-10 | 2020-12-22 | 大同煤矿集团有限责任公司 | Method for calculating hole spacing of weakened top plate of intensive drilling |
| CN112665472A (en) * | 2021-01-13 | 2021-04-16 | 东北大学 | Carbon dioxide rock breaking device and method for open pit mine |
-
2014
- 2014-12-29 CN CN201420858542.8U patent/CN204419145U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
| CN105332684A (en) * | 2015-11-13 | 2016-02-17 | 重庆大学 | High-pressure water burst and CO2 fracturing combined coal bed gas displacement extraction technology |
| CN105332684B (en) * | 2015-11-13 | 2017-09-12 | 重庆大学 | A kind of water under high pressure is quick-fried and CO2The coal bed gas displacement extraction technique that pressure break is combined |
| CN107461185A (en) * | 2017-10-09 | 2017-12-12 | 中国矿业大学(北京) | A kind of new fracturing drainage from coal seam coal seam device of air |
| CN107725102A (en) * | 2017-11-06 | 2018-02-23 | 贵州工程应用技术学院 | A kind of water under high pressure and dry ice synergy permeability improvement device and method |
| CN110487137A (en) * | 2019-08-27 | 2019-11-22 | 山东科技大学 | A kind of deep hole presplitting water coincidence blast charging structure and construction method |
| CN110487137B (en) * | 2019-08-27 | 2021-07-23 | 山东科技大学 | Deep hole pre-splitting water coupling blasting charging structure and construction method |
| CN112115599A (en) * | 2020-09-10 | 2020-12-22 | 大同煤矿集团有限责任公司 | Method for calculating hole spacing of weakened top plate of intensive drilling |
| CN112665472A (en) * | 2021-01-13 | 2021-04-16 | 东北大学 | Carbon dioxide rock breaking device and method for open pit mine |
| CN112665472B (en) * | 2021-01-13 | 2023-06-30 | 东北大学 | Carbon dioxide rock breaking device and method for open-pit mine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20171229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |