CN107023295B - Hard coal erosion-prevention pressure-relief drilling construction method and equipment - Google Patents
Hard coal erosion-prevention pressure-relief drilling construction method and equipment Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 147
- 238000005553 drilling Methods 0.000 title claims abstract description 129
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 51
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- 238000005516 engineering process Methods 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000011010 flushing procedure Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 25
- 230000002265 prevention Effects 0.000 claims description 12
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- 239000011148 porous material Substances 0.000 claims description 2
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- 238000005065 mining Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 13
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- E21C41/16—Methods of underground mining; Layouts therefor
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Abstract
The invention discloses a hard coal erosion-prevention pressure-relief drilling construction method and equipment, which adopt a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, firstly use high-pressure water jet to flush coal bodies and form a drilling section, then use a drill bit to crush the flushed coal bodies, and then use high-pressure water backflow to carry out coal powder, thereby forming a three-level drilling technology of hydraulic rock falling, mechanical rock breaking and backflow rock carrying, and playing roles of drilling, hole forming, dust falling, powder discharging and cooling. The 'first flushing and then breaking' drilling technology changes a mechanical drilling mode, retains the mechanical breaking characteristic, improves the drilling efficiency of the drill hole, and integrates the hydraulic anti-impact characteristic, thereby effectively solving the problems of low-efficiency drilling, drill sticking and rod losing, dust accumulation and the like of the coal seam anti-impact drilling.
Description
Technical Field
The invention relates to the technical field of coal mine rock burst prevention and control, in particular to a hard coal anti-scour pressure-relief drilling construction method and equipment.
Background
Rock burst is one of the most serious dynamic disasters faced by coal mines in China. With the gradual reduction of shallow coal resource reserves and the continuous increase of mining depth, according to statistics, the coal resource reserves buried deeper than kilometers in China account for 53 percent of the total amount of the coal resources, the number of coal mines mined by the current super kilometers is over 45, and the maximum mining depth is close to 1500 meters; the coal resources easy to mine are gradually exhausted, and the proportion of the coal yield in complex mining and difficult mining is increased. With the increase of coal mining intensity and the deterioration of coal mining conditions, rock burst disasters become more and more serious, and currently, more than 160 rock burst mines exist in the whole country. The geological conditions of coal mining in China are complex, the factors of rock burst are multiple, the difficulty of effective prevention and control is high, and the safe and efficient production of mines is severely restricted. Therefore, the deep research on the coal mine rock burst prevention and control technology has important significance.
Rock burst is generally considered to be a stress problem, i.e., rock burst occurs when the stress in the coal body meets the rock burst occurrence critical stress condition. Therefore, the key to preventing and controlling rock burst is to change the stress state of the coal body and weaken the impact tendency of the coal body, namely, the possibility of impact occurrence is reduced by destroying the structure of the coal body and weakening the energy storage performance of the coal body.
At present, the deep mine rock burst disaster is very serious, and the prevention and treatment task is difficult. Scholars at home and abroad develop a great deal of research on anti-scour technology and means. The core idea of rock burst prevention and control is to transfer a high stress area to the deep part of a coal body, reduce the stress peak value of a stress concentration area, weaken the impact tendency of the coal body and reduce the energy accumulation of the stress concentration area. This presents a regional and localized anti-shock measure to this problem. The regional anti-impact measures comprise a mining protective layer, reasonable development, optimization of mining sequence, roadway arrangement, coal mining process and the like; the local scour protection measures comprise coal seam blasting, coal seam water injection, drilling pressure relief and the like. The mining protective layer can play a fundamental role in preventing and controlling the rock burst, but has an application condition which needs to meet the occurrence condition of a coal bed, and regional prevention and control are mainly carried out on site through reasonable development and optimization of a mining sequence, roadway arrangement and a coal mining process, such as fault mining, two-wing alternate mining, working face sequential mining, one-time mining total height and the like.
These anti-impact technologies have certain limitations, such as low pressure relief efficiency, serious drill pipe loss, unsafe construction, and incapability of completely meeting the requirements of rapid and safe danger relief of impact danger areas. In particular hard coal, which is generally referred to as Pyth coefficient f > 2. By adopting the conventional drilling machine for drilling, the coal body is hard, the broken lump degree of the coal body is large, the coal slag is not smoothly discharged from the drill hole, so that the phenomena of drill bit jamming, drill dropping and the like are caused, the drilling construction efficiency is low, and the loss of the drill bit and the drill rod is large.
(1) Coal bed blasting pressure relief
The blasting pressure relief refers to the concentrated charging blasting at the bottom of the drill hole to break the continuity of the coal body, so that the high stress state in the coal body is changed, the stress is transferred to the deep part of the surrounding rock, and simultaneously, the elastic energy stored in the coal body is released in a controlled manner. When the blasting takes place, the explosive takes place the explosion in the coal body to the explosion point is the center, and the coal body reduces by inside outwards destruction degree gradually, and its influence range can divide into three region: a crushing zone, a fissuring zone and a shaking zone.
The pressure relief blasting method has the disadvantage that the method is only suitable for coal strata with large ground stress and hard coal quality. In addition, the explosive can release a great deal of kinetic energy when being exploded, if the design parameters are not proper, the explosive cannot release pressure, but can induce impact pressure, and in addition, the explosive can cause flail shots and misfires in the implementation process, thereby threatening the safety of field constructors. Therefore, this method has a certain risk.
(2) Coal seam water injection
The coal seam water injection means injecting high-pressure water into the coal seam, fracturing the coal body and destroying the structure of the coal body, so that the bearing capacity of the coal body is reduced, and in addition, the physical and mechanical properties of the coal body can be reduced by injecting the water. The method has the characteristics of low cost, simple operation and strong adaptability.
However, the coal seam water injection measure is generally applicable to coal seams with strong water absorption, and the effect is not good when the method is used in hard coal seams.
(3) Hydraulic fracturing and hydraulic slotting pressure relief
The hydraulic fracturing is to press out a crack in a coal bed by taking the physical and mechanical properties of a coal body into consideration and utilizing the action of high-pressure water flow, and the crack is continuously expanded, so that the coal body around the crack is more broken, and the elastic energy in the coal body is released; the high-pressure jet drilling and cutting pressure relief of the coal body takes the coal pillar as a safety barrier, when a hole is drilled by water jet, coal and water are discharged out of the hole through the drilled hole, the coal body around the drilled hole violently moves towards the direction of the hole channel, and simultaneously expansion deformation of the coal body and opposite displacement of a top bottom plate occur, so that stress in a certain range around the drilled hole is reduced, and high stress is transferred to the deep part of the coal body, thereby playing a role in local pressure relief of the coal body.
The hydraulic fracturing and hydraulic slotting pressure relief processes are slightly different, and the application fields are also different. The construction process of the method is complex, the problems of incompatibilities and incompleteness of technology and equipment exist in the practical engineering application, the fracturing range is difficult to control, and uniform pressure relief is realized.
(4) Slitting pressure relief
The principle of action of the method lies in that after the pressure relief groove is dug, the stress of the coal body is transferred to the deep part, the pressure relief range is expanded, the elastic energy in the coal body is released, a large amount of deformation of the surrounding rock is absorbed, and the distribution range of the stress field of the surrounding coal body is changed.
The quality of the pressure relief effect of the cut depends on the size of a pressure relief range formed after the pressure relief groove is excavated.
(5) Coal seam drilling pressure relief
A drilling free surface is formed in a high-stress area in a coal body in a drilling mode, so that the strength of the coal body in the area is weakened, a local weakened area or weakened zone is formed, a compensation space is provided for expansion deformation of the coal body in the stress release process, namely a coal bed increasing and changing pressure relief effect is provided, a supporting pressure peak value is transferred to the deep part of surrounding rocks, and the damage effect of high stress on a well lane is reduced.
According to the principle of stress three-dimensional transfer, large-diameter drilling is adopted for pressure relief of a local area with the danger of rock burst, so that surrounding rocks at a certain depth of a roadway are structurally damaged to form a weakening zone, high stress in the surrounding rocks at the periphery of the roadway is transferred to the deep part, and the surrounding rocks at the periphery of the roadway are located in a low-stress area.
According to field practice and comparative analysis carried out on various pressure relief measures, results show that the coal seam drilled hole can go deep into a high stress zone, the pressure relief effect is good, flexible and reliable, and the method is particularly suitable for pressure relief and danger relief of a high stress area of the coal seam. However, the field application also shows that the technology still has certain defects: firstly, the existing drilling technology cannot achieve due pressure relief effect, which is closely related to drilling quality, drilling efficiency and the like; secondly, the drilling efficiency is low, and the drill rod is easy to lose due to drill sticking; thirdly, under the condition of non-ideal construction environment, continuous drilling of a large-diameter deep hole cannot be realized; in addition, in the danger solving process, potential safety hazards exist for constructors.
A large number of field applications show that the method improves the impact tendency of the coal body to a certain extent, namely, the possibility of impact occurrence is reduced by destroying the structure of the coal rock body and weakening the elastic potential energy accumulated in the coal rock body, but due to the limitations of various methods, such as low pressure relief efficiency, poor effect, unsafe construction and the like, the methods cannot completely meet the requirement of pressure relief in a high-stress area of a deep well. Therefore, there is a need to develop a trocar for efficient and safe coal seam pressure relief technology for deep percussive mines. The technology not only needs to meet the basic requirements of on-site anti-impact, but also needs to obviously improve the construction efficiency of coal seam anti-impact drilling, reduce the drilling cost and improve the safety level.
Disclosure of Invention
The invention provides a hard coal anti-scour pressure-relief drilling construction method and equipment aiming at the defects. The invention improves the existing coal seam drilling pressure relief technology, and provides a novel coal seam anti-scour drilling technology combining mechanical drilling and hydraulic jet drilling, namely the coal seam anti-scour drilling technology of 'firstly rushing and then breaking'. The method specifically comprises the steps of firstly utilizing high-pressure water flow to flush down coal bodies and form a drilling section, then utilizing a drill bit to crush the flushed down coal bodies, and utilizing high-pressure water backflow to bring out coal powder, so that a three-level drilling technology of hydraulic rock falling, mechanical rock breaking and backflow rock carrying is formed, and the effects of drilling, pore forming, dust falling, powder discharging and cooling are achieved. The 'first flushing and then breaking' drilling technology changes a mechanical drilling mode, retains the mechanical breaking characteristic, improves the drilling efficiency of the drill hole, and integrates the hydraulic anti-impact characteristic, thereby effectively solving the problems of low-efficiency drilling, drill sticking and rod losing, dust accumulation and the like of the coal seam anti-impact drilling.
The core idea of rock burst prevention and control is to transfer a high stress area to the deep part of a coal body, reduce the stress peak value of a stress concentration area, weaken the impact tendency of the coal body and reduce the energy accumulation of the stress concentration area.
The invention relates to a hard coal erosion-prevention pressure-relief drilling construction method and equipment. Thereby forming a three-level drilling technology of hydraulic rock falling, mechanical rock breaking and backflow with rocks, and playing the roles of drilling, pore-forming, dust falling, powder discharging and cooling. The 'first flushing and then breaking' drilling technology changes a mechanical drilling mode, retains the mechanical breaking characteristic, improves the drilling efficiency of the drill hole, and integrates the hydraulic anti-impact characteristic, thereby effectively solving the problems of low-efficiency drilling, drill sticking and rod losing, dust accumulation and the like of the coal seam anti-impact drilling.
On one hand, the hydraulic jet drill is used for punching and drilling holes, so that the drilling efficiency is improved, and meanwhile, the cooling and lubricating effects are provided for the operation of a drill rod; on the other hand, high-pressure water flow in the drill hole is beneficial to coal dust guiding and discharging and dust falling; in addition, the hydraulic jet flows rush down coal bodies in advance, so that the confining pressure of a drill rod is reduced, and the drill clamping and the rod losing are effectively avoided; the hydraulic jet flow has the function of preventing water from flowing into the coal seam.
The hard coal erosion-prevention pressure-relief drilling construction method adopts a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, and comprises the following steps of:
(1) firstly, utilizing high-pressure water flow to wash off coal bodies and forming a drilling section;
(2) crushing the flushed coal body by using a drilling machine;
(3) then the coal powder is carried out by flushing with water flow.
The hard coal refers to the coefficient of Pythagorean f > 2.
In the step (1), the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30 MPa.
In the step (1), the diameter of the punched hole is 100-150 mm.
The hard coal erosion-prevention pressure-relief drilling construction equipment used in the construction method comprises a drilling machine, a drill rod, a drill bit and drill teeth which are sequentially connected, wherein high-pressure nozzle ejectors are arranged at the front ends of the drill bit and the drill teeth, a water inlet pipe is arranged in the drill rod, one end of the water inlet pipe penetrates through the drilling machine and is connected with a high-pressure water pipe, and the other end of the water inlet pipe is respectively connected with the high-pressure nozzle ejectors at the front ends of the drill bit and the.
The drill bit front end is provided with more than 3 outer lane high pressure nozzle ejectors that use the drill bit center to be the ring form and distribute, and the drill tooth front end is provided with more than 3 inner circle high pressure nozzle ejectors that use the drill bit center to be the ring form and distribute, and the ring radius that the inner circle high pressure nozzle ejector formed is less than the ring radius that outer lane high pressure nozzle ejector formed.
The drill bit is a PDC drill bit (polycrystalline diamond compact drill bit).
The diameter of the drill bit is 100 mm.
The drill tooth comprises a base body fixedly connected with the drill bit and blades protruding out of the surface of the base body, the inner ring high-pressure nozzle ejector is located on the surface of the base body outside the blades, and the blades are distributed in a spiral mode (the spiral blades can reduce the rotary effect of the drill bit and help rock debris discharge).
PDC teeth are arranged on the surfaces of the blades.
The invention has the beneficial effects that: the invention provides a 'first-flushing and then-drilling' coal seam scour prevention drilling technology, which is provided for the phenomena of low pressure relief efficiency and poor effect of the high-stress area drilling hole. The invention provides an important technical means and equipment for preventing and controlling the rock burst of the coal mine. On one hand, the application of the technology can obviously improve the drilling efficiency of the anti-impact drilling hole and ensure the anti-impact effect of the impact dangerous area; secondly, the pressure relief cost of the area is reduced; thirdly, the application of the invention can further improve the safe production level of the mine.
Therefore, the 'flushing before drilling' coal seam scour prevention drilling technology is applied to rock burst control, has remarkable economic and social benefits, has wide market popularization value, has very important significance for guaranteeing safe and efficient exploitation of rock burst coal seams, and has promotion effect on the prevention and treatment of major accidents in the process of promoting the safe production of deep wells.
Description of the drawings:
FIG. 1 is a schematic structural view of a hard coal erosion and pressure relief drilling device according to the present invention;
FIG. 2 is an enlarged view of portion A;
FIG. 3 is a schematic front view of the drill bit;
1-high-pressure water pipe, 2-drilling machine, 4-drilling rod, 5-water inlet pipe, 6-drilling bit, 7-outer ring high-pressure nozzle ejector, 8-inner ring high-pressure nozzle ejector, 9-PDC tooth, 10-drilling tooth, 11-blade and 12-basal body.
The specific implementation mode is as follows:
for better understanding of the present invention, the technical solution of the present invention will be described in detail with specific examples, but the present invention is not limited thereto.
Example 1
And (2) 37075of Shandong province, and the city coal mine is taken as a typical deep mine (the mining depth is 1000m), and is seriously threatened by rock burst disasters. In the last two years, \ 37075, 6 times of rock burst occurrence in urban well fields causes hundreds of meters of roadway damage, brings great economic loss to mine enterprises, and also seriously threatens the life safety of underground personnel.
37075A. the mined coal bed of the urban coal mine is 3 coal beds with the average thickness of 6.3m and the unidirectional compressive strength of 15MPa, and is threatened by rock burst in the process of roadway excavation and working face stoping. 37075, the city coal mine is constructed by a frame column type pressure relief drilling machine originally, three workers are operated in one shift, and 3 pressure relief drill holes are constructed in one shift under the normal condition that the drill is not blocked, namely 75 m.
The method is adopted to carry out large-diameter pressure relief drilling on two sides of the roadway, the depth of the holes is 25m, the diameter of the drilled holes is 150mm, and the distance between the holes is 2 m. After the construction method is adopted, 4 pressure relief drill holes can be constructed in one shift under normal conditions, namely 100m, and the efficiency is improved by 33.3 percent.
The specific scheme is as follows:
the hard coal erosion-prevention pressure-relief drilling construction method adopts a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, and comprises the following steps of:
(1) firstly, utilizing high-pressure water flow to wash off coal bodies and forming a drilling section; the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30 MPa. The diameter of the drilled hole after punching is 100-150 mm. (2) Crushing the flushed coal body by using a drilling machine;
(3) then the coal powder is carried out by flushing with water flow.
The hard coal erosion-prevention pressure-relief drilling construction equipment used in the construction method comprises a drilling machine 2, a drill rod 4, a drill bit 6 and drill teeth 10 which are sequentially connected, wherein high-pressure nozzle ejectors are arranged at the front ends of the drill bit 6 and the drill teeth 10, a water inlet pipe 5 is arranged inside the drill rod 4, one end of the water inlet pipe 5 penetrates through the drilling machine 2 and is connected with a high-pressure water pipe 1, and the other end of the water inlet pipe 5 is respectively connected with the high-pressure nozzle ejectors at the front ends of the drill bit 6 and the drill.
The front end of the drill bit 6 is provided with more than 3 outer ring high-pressure nozzle ejectors 7 which are distributed in a circular ring shape by taking the center of the drill bit 6 as a circle center, the front end of the drill tooth 10 is provided with more than 3 inner ring high-pressure nozzle ejectors 8 which are distributed in a circular ring shape by taking the center of the drill bit 6 as a circle center, and the radius of a ring formed by the inner ring high-pressure nozzle ejectors 8 is smaller than that of a ring formed by the outer ring high-pressure nozzle ejectors 7.
The drill bit 6 is a PDC drill bit (polycrystalline diamond compact drill bit).
The diameter of the drill 6 is 100 mm.
The drill tooth 10 comprises a base body 12 fixedly connected with the drill bit 6 and blades 11 protruding out of the surface of the base body 12, the inner ring high-pressure nozzle ejector 8 is located on the surface of the base body 12 outside the blades 11, and the blades 11 are distributed spirally (the spiral blades 11 can reduce the rotary action of the drill bit and help rock debris discharge).
PDC teeth are arranged on the surfaces of the blades 11.
The invention relates to a hard coal erosion-prevention pressure-relief drilling construction method, which adopts a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, firstly uses high-pressure water flow to flush coal bodies and form a drilling section, then uses a drill bit to crush the flushed coal bodies, and then uses high-pressure water to carry out backflow to take out coal dust. Thereby forming a three-level drilling technology of hydraulic rock falling, mechanical rock breaking and backflow with rocks, and playing the roles of drilling, pore-forming, dust falling, powder discharging and cooling. The 'first flushing and then breaking' drilling technology changes a mechanical drilling mode, retains the mechanical breaking characteristic, improves the drilling efficiency of the drill hole, and integrates the hydraulic anti-impact characteristic, thereby effectively solving the problems of low-efficiency drilling, drill sticking and rod losing, dust accumulation and the like of the coal seam anti-impact drilling.
On one hand, the hydraulic jet drill is used for punching and drilling holes, so that the drilling efficiency is improved, and meanwhile, the cooling and lubricating effects are provided for the operation of a drill rod; on the other hand, high-pressure water flow in the drill hole is beneficial to coal dust guiding and discharging and dust falling; in addition, the hydraulic jet flows rush down coal bodies in advance, so that the confining pressure of a drill rod is reduced, and the drill clamping and the rod losing are effectively avoided; the hydraulic jet flow has the function of preventing water from flowing into the coal seam.
The method has very important significance for preventing and treating the rock burst disasters in 37075and urban well fields, and meanwhile, the obtained related results have a certain promotion effect on preventing and treating the rock burst disasters in other mining areas. The research result of the project has great popularization and application value.
Example 2
The hard coal erosion-prevention pressure-relief drilling construction method adopts a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, and comprises the following steps of:
(1) firstly, utilizing high-pressure water flow to wash off coal bodies and forming a drilling section; the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30 MPa. The diameter of the drilled hole after punching is 100-150 mm. (2) Crushing the flushed coal body by using a drilling machine;
(3) then the coal powder is carried out by flushing with water flow.
The hard coal refers to the coefficient of Pythagorean f > 2.
The invention relates to a hard coal erosion-prevention pressure-relief drilling construction method, which adopts a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling, firstly uses high-pressure water flow to flush coal bodies and form a drilling section, then uses a drill bit to crush the flushed coal bodies, and then uses high-pressure water to carry out backflow to take out coal dust. Thereby forming a three-level drilling technology of hydraulic rock falling, mechanical rock breaking and backflow with rocks, and playing the roles of drilling, pore-forming, dust falling, powder discharging and cooling. On one hand, the hydraulic jet drill is used for punching and drilling holes, so that the drilling efficiency is improved, and meanwhile, the cooling and lubricating effects are provided for the operation of a drill rod; on the other hand, high-pressure water flow in the drill hole is beneficial to coal dust guiding and discharging and dust falling.
The construction method uses a ZQJG-580/10.0 type pneumatic drill. Compared with the hard coal scour prevention pressure relief drilling construction equipment in the embodiment 1 of the invention, the drill jamming and rod dropping phenomena are more frequent by using the drilling machine.
Claims (1)
1. A hard coal erosion-prevention pressure-relief drilling construction method is characterized in that a coal seam erosion-prevention drilling technology of mechanical drilling and hydraulic jet drilling is adopted, and the method comprises the following steps:
(1) firstly, using high-pressure water flow to wash off a coal body and form a drilling section, wherein the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30MPa, and the diameter of a drilled hole after punching is 100-150 mm;
(2) crushing the flushed coal body by using a drilling machine;
(3) then, flushing with water flow to take out coal powder; thereby forming hydraulic rock falling, mechanical rock breaking and backflow zone rock; the three-stage drilling technology plays roles of drilling, pore forming, dust settling, powder discharging and cooling;
the hard coal is the coefficient f of Pythagorean is more than 2;
the hard coal scour prevention pressure relief drilling construction equipment for realizing the method comprises a drilling machine, a drill rod, a drill bit and drill teeth which are sequentially connected, wherein high-pressure nozzle ejectors are arranged at the front ends of the drill bit and the drill teeth, a water inlet pipe is arranged in the drill rod, one end of the water inlet pipe penetrates through the drilling machine and is connected with a high-pressure water pipe, and the other end of the water inlet pipe is respectively connected with the high-pressure nozzle ejectors at the front ends of the drill bit and the;
the front end of the drill bit is provided with more than 3 outer ring high-pressure nozzle ejectors which are distributed in a circular ring shape by taking the center of the drill bit as the circle center, the front end of the drill tooth is provided with more than 3 inner ring high-pressure nozzle ejectors which are distributed in a circular ring shape by taking the center of the drill bit as the circle center, the radius of a ring formed by the inner ring high-pressure nozzle ejectors is smaller than that of a ring formed by the outer ring high-pressure nozzle ejectors, and the drill bit is a;
the diameter of the drill bit is 100 mm;
the drill tooth comprises a base body fixedly connected with the drill bit and blades protruding out of the surface of the base body, the inner ring high-pressure nozzle ejector is positioned on the surface of the base body outside the blades, and the blades are spirally distributed;
PDC teeth are arranged on the surfaces of the blades.
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| CN110107284B (en) * | 2019-04-28 | 2022-08-05 | 扎赉诺尔煤业有限责任公司 | Drilling and testing system and method for detecting height of water flowing fractured zone through water pressure |
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| CN111810057B (en) * | 2020-07-06 | 2022-07-19 | 山东科技大学 | Use method of advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure |
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