CN107290223A - Hard coal seam water filling weakens experimental provision and its application method - Google Patents
Hard coal seam water filling weakens experimental provision and its application method Download PDFInfo
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- CN107290223A CN107290223A CN201710657108.1A CN201710657108A CN107290223A CN 107290223 A CN107290223 A CN 107290223A CN 201710657108 A CN201710657108 A CN 201710657108A CN 107290223 A CN107290223 A CN 107290223A
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- packer
- pressure
- high pressure
- water
- injection pump
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
The present invention relates to a kind of hard coal seam water filling reduction experimental provision and its application method, fracturing equipment is blocked provided with both-end, and both-end closure fracturing equipment includes packer, packer includes being provided with what is be spaced apart along its length, the external packer of flexible connection and interior packer, therefore the packing section after external packer and interior packer pressurising between external packer and interior packer is formed into confined space, coal body in section is insulated by high pressure water injection pump priming fracturing, can solve often to occur during deep hole high pressure water injection can not pressurize technical barrier, condition is created for the infiltration of follow-up coal seam low pressure, it is simple in construction, flood effectiveness is good, water injection to keep pressure can be realized to ensure that low pressure infiltrates, so as to effectively weaken coal seam, reduce pick consumption, the problem of fundamentally solving to use mechanical mining in harder coal seam.
Description
Technical field
The present invention relates to the technical field of coal mining, more particularly to a kind of hard coal suitable for underground mine engineer
Layer water filling reduction experimental provision and its application method.
Background technology
Coal seam is according to hardness divided into extremely hard coal seam 5.0>f>4.0th, hard coal seam 4.0>f>3.0th, middle hard coal seam 3.0>f>1.5th, it is soft
Coal seam 1.5>f>0.8th, extremely soft seam 0.8>f>0.5 5 classifications, and cutting coal machine typically suitably cuts the work of seam hardness f≤4
Face.
In harder coal seam production, using mechanical coal mining because coal body is harder, coal-winning machine when producing coal cutting very
Difficulty, generally cuts motionless phenomenon, not only causes pick consumption to increase but also also frequently causes the machinery of coal-winning machine
Accident, again by coal mining machine cut after generally making coal seam soft using the method for driving coal side, rib vibrations big gun in production practices
Coal, also using shallow holes irrigation in coal body method and longhole infusion method, but flood effectiveness is undesirable, frequent appearance nothing
The problem of method pressurize, it is impossible to the problem of fundamentally solving to use mechanical mining in harder coal seam.
Therefore, the designer of the present invention is in view of drawbacks described above, by concentrating on studies and designing, synthesis is engaged in for many years for a long time
The experience and achievement of related industry, research and design go out a kind of hard coal seam water filling reduction experimental provision and its application method, with gram
Take drawbacks described above.
The content of the invention
It is an object of the invention to provide a kind of hard coal seam water filling reduction experimental provision and its application method, structure letter
Single, flood effectiveness is good, can realize water injection to keep pressure to ensure that low pressure infiltrates, and then fundamentally solve in harder coal seam
The problem of using mechanical mining.
To solve the above problems, weakening experimental provision the invention discloses a kind of hard coal seam water filling, it is characterised in that bag
Include orifice tube, both-end closure fracturing equipment, high pressure water injection pipe, high pressure water-injection pump, high-pressure manometer, low pressure hose, filter and suction
Water pipe；
The fixedly sleeved outer end installed in coal bed drilling of the orifice tube；
The both-end closure fracturing equipment is arranged in coal bed drilling, and both-end closure fracturing equipment includes packer, packer bag
Include the external packer and interior packer along its length provided with flexible connection that is being spaced apart；External packer is that annular is hollow
Capsule structure, annular hollow capsule structure, which is provided with, removably includes the high-pressure nylon pipe of high pressure valve；Interior packer is end cap shape
It also is provided with removably including the high-pressure nylon pipe of high pressure valve in hollow capsule structure, the hollow capsule structure of end cap shape；
One end of the high pressure water injection pipe penetrates orifice tube and stretched in coal bed drilling and both-end closure fracturing equipment outer end
External packer annular center closed connection connection, the port of export of the other end and high pressure water-injection pump connect, high pressure water-injection pump goes out
Mouth is additionally provided with high-pressure manometer on end；
The port of export of one end of described low pressure hose and the arrival end connection of high pressure water-injection pump, the other end and filter connects
Connect；
One end of the arrival end of described filter and suction hose is connected, the other end of suction hose submerge the liquid level in pond with
Under.
Wherein, the suction hose is provided with low pressure gauge, flowmeter and stop valve.
Also disclose the application method that hard coal seam water filling as described above weakens experimental provision, it is characterised in that comprising such as
Lower step：
A) test hole site is determined：Drill through coal bed drilling and rower of going forward side by side draws, situation in inspection hole, determine that nothing is caved in hole
It is intact, unimpeded；
B) hole external packer applied voltage test：Packer, high-pressure nylon pipe and high pressure water-injection pump are sequentially connected, entered outside hole
Row applied voltage test, packages packer with sleeve pipe first, then starts high pressure water-injection pump and adds respectively to external packer and interior packer
Check whether packer inflation and pipeline sealing are good in pressure, pressure process, observation high-pressure manometer reaches final test pressure
When, confirm packer and pipeline is functional, No leakage, otherwise overhauled or exchanged part, repeat this step, up to reaching
It is required that；
C) packer is inserted：Interior packer and external packer are pushed into successively with drilling rod to need the setting of test in coal bed drilling
Require that sealing is tightened between drilling rod thread during position, push-in packer, while to prevent the high pressure Buddhist nun being connected with packer
Imperial pipe is extruded damage；
D) packer pressurizes in hole：Pressure gauge and connection member are connected first and confirms good seal, connecting with packer
The high-pressure nylon pipe and high pressure water-injection pump connect is attached, and opens high pressure valve, is then pressurizeed to packer, is noted in pressure process
Anticipate high-pressure manometer pressure change, when reaching packing setting pressure, confirm packer and pipeline is functional, after No leakage, close
Close high pressure valve and dismantling high pressure valve makes it be separated with high pressure water-injection pump；
E) hydrofracturing：After the packing of the hole section to be tested, low pressure gauge and flowmeter are connected, high pressure water injection is confirmed
Pump work position is correct, recording flowmeter initial reading and time, starts high pressure water-injection pump and carries out applied voltage test to test section；Examination
Recording flowmeter reading and time at the end of testing；
F) it is completed, closes power supply, opens the high pressure valve being connected with high-pressure nylon pipe, treat that the water in packer is complete
Another position that need to be tested on packer to coal bed drilling outside direction is pulled after outflow, second is carried out and tests；With this
Analogize, until completing whole section of test of the coal bed drilling, close power supply, detaching pipelines and instrument, withdraw from both-end closure fracturing equipment,
Proceed the hydrofracturing work in other holes.
Wherein, in described step e) in test process, high pressure water-injection pump is pressurizeed with maximum stream flow, is pressurizeed for the first time
Pressure value after maximum is raised to pressure to fall after rise to setting value and pressurize to setting time, then stops being forced into setting time,
Last release；Pressure is pressurized to for the second time is raised to after maximum pressurize to setting time.
Wherein, after the hydrofracturing work of multiple coal bed drillings is completed, with high-voltage tube by each coal bed drilling orifice part
It is attached and porous hydraulic fracturing work is carried out while being connected on high pressure water-injection pump by switching valve.
Wherein, Advance Water Injection distance is 200m.
Wherein, from coal bed drilling bottom outward direction using 30m as a packing section.
By said structure, hard coal seam water filling reduction experimental provision of the invention and its application method are provided with both-end
Fracturing equipment is blocked, and both-end closure fracturing equipment includes packer, packer is included along its length provided with being spaced apart, soft
Property connection external packer and interior packer, therefore by external packer after external packer and interior packer pressurising and interior packer it
Between packing section i.e. form confined space, pass through high pressure water injection pump priming fracturing insulate section in coal body, it is possible to resolve deep hole high pressure
Often occur during water filling can not pressurize technical barrier, be that the infiltration of follow-up coal seam low pressure creates condition, simple in construction, water filling
Effect is good, can realize water injection to keep pressure to ensure that low pressure infiltrates, thus effectively reduction coal seam, reduction pick consumption, from basic
The problem of upper solution uses mechanical mining in harder coal seam.
The detailed content of the present invention can be obtained by explanation described later and institute's accompanying drawing.
Brief description of the drawings
Fig. 1 shows that the hard coal seam water filling of the present invention weakens the structural representation of experimental provision；
Fig. 2 shows structural representation when the porous hydraulic fracturing of progress of the present invention works.
Reference：
1st, packer, 2, orifice tube, 3, high pressure water injection pipe, 4, high pressure water-injection pump, 5, high-pressure manometer, 6, low pressure hose,
7th, filter, 8, low pressure gauge, 9, flowmeter, 10, stop valve, 11, pond.
Embodiment
Referring to Fig. 1 and 2, it is shown that hard coal seam water filling reduction experimental provision of the invention and its application method.
As shown in figure 1, the hard coal seam water filling reduction experimental provision includes orifice tube 2, both-end closure fracturing equipment, high pressure
Water injection pipe 3, high pressure water-injection pump 4, low pressure hose 6, filter 7 and suction hose.
The described fixedly sleeved outer end installed in coal bed drilling of orifice tube 2, for supporting fixed both-end closure fracturing equipment
With high pressure water injection pipe 3.
Described both-end closure fracturing equipment is arranged in coal bed drilling, and both-end closure fracturing equipment includes packer 1, the envelope
Every device 1 by external packer and interior packer be spaced apart along its length, being flexibly connected, wherein, the external packer
Use for annular hollow capsule structure, the annular hollow capsule structure is provided with removably including the high pressure nylon of high pressure valve
Pipe, the interior packer is also to be provided with removably including height in the hollow capsule structure of end cap shape, the hollow capsule structure of end cap shape
The high-pressure nylon pipe of pressure valve.
One end of the high pressure water injection pipe 3 penetrates orifice tube and stretched in coal bed drilling and both-end closure fracturing equipment outer end
External packer the closed connection connection of annular center, the other end is connected with the port of export of high pressure water-injection pump 4, it is preferred that described
High-pressure manometer 5 is additionally provided with the port of export of high pressure water-injection pump 4.
One end of described low pressure hose 6 is connected with the arrival end of high pressure water-injection pump 4, the outlet of the other end and filter 7
End connection.
The arrival end of described filter 7 and one end of suction hose are connected, and the other end of suction hose submerges the liquid in pond 11
Below face, and suction hose is provided with low pressure gauge 8, flowmeter 9 and stop valve 10.
The water filling of this hard coal seam weakens experimental provision in use, after Completion of Drilling Hole, fracturing equipment is blocked from hole using both-end
Bottom is using 30m as a packing section, by high pressure pump priming, is that follow-up coal-bed flooding efficiency improves wound by coal mass fracture in packing section
Condition is made, specifically used step is as follows：
A) test hole site is determined：Coal bed drilling rower of going forward side by side is drilled through to draw, including record tunnel title, hole number), inspection hole
Interior situation, determines in hole intact, unimpeded to be tested without caving in.
B) hole external packer applied voltage test：Packer 1, high-pressure nylon pipe and high pressure water-injection pump 4 are sequentially connected, outside hole
Applied voltage test is carried out, packer 1 is packaged with sleeve pipe first, then starts high pressure water-injection pump 4 respectively to external packer and interior packing
Device pressurizes, and checks whether packer inflation and pipeline sealing are good in pressure process, observation high-pressure manometer 5 reaches final experiment
During pressure (5.0MPa), confirm packer (1) and pipeline is functional, after No leakage, further work can be carried out；Otherwise enter
Part is exchanged in row maintenance, is tested again, untill reaching requirement.
C) packer is inserted：Interior packer and external packer are pushed into successively with drilling rod to need the setting of test in coal bed drilling
Require that sealing is tightened between drilling rod thread during position, push-in packer 1, while to prevent the high pressure being connected with packer 1
Nylon tube is extruded damage, carries out equipment safety work.
D) packer pressurizes in hole：Pressure gauge and connection member are connected first and confirms good seal, connecting with packer 1
The high-pressure nylon pipe and high pressure water-injection pump 4 connect is attached, and is opened high pressure valve, is then pressurizeed to packer 1, in pressure process
Note the pressure change of high-pressure manometer 5, when reaching packing pressure (5.0MPa), confirm packer 1 and pipeline it is functional, without letting out
After leakage, close high pressure valve and dismantling high pressure valve makes it be separated with high pressure water-injection pump 4.
E) hydrofracturing：After the packing of the hole section to be tested, low pressure gauge 8 and flowmeter 9 are connected, high pressure injection is confirmed
The operating position of water pump 4 is correct, recording flowmeter initial reading and time, starts high pressure water-injection pump 4 and carries out pressurization examination to test section
Test；Recording flowmeter reading and time (original record conscientiously being carried out, so as to analysis and processing) during off-test；
In test process, high pressure water-injection pump 4 is pressurizeed with maximum stream flow, and pressure is pressurized to for the first time and is raised to after maximum
Pressure value falls back to certain value (keeping pressurization 20 minutes), stops pressurization 1 minute, then release (about 1 minute)；Add for the second time
Pressure is pressed onto to be raised to after maximum and (keep pressurization 20 minutes).
F) it is completed, closes power supply, opens the high pressure valve being connected with high-pressure nylon pipe, treat that the water in packer 1 is complete
Another position that need to be tested after full outflow on drawing packer 1 to coal bed drilling outside direction, carries out second and tests；With
This analogizes, until completing whole section of test of the coal bed drilling, closes power supply, detaching pipelines and instrument, withdraws from both-end closure pressure break
Device, proceeds the hydrofracturing work in other holes.
, can be with high-voltage tube by each coal bed drilling as shown in Fig. 2 after the hydrofracturing work of multiple coal bed drillings is completed
Orifice part is attached and is connected to by cross valve on high pressure water-injection pump 4, just can carry out porous hydraulic fracturing work, pressure break
Liquid typically selects clear water, starts hydraulic fracturing pump, water under high pressure is injected into coal body.
Can according to the requirement to water injection pressure, water injection rate, and hydraulic fracturing pump technical performance and coal mining speed with
Coal body infiltrates the relation of reduction time, can be accelerated waterflood injection rate using modes such as single pump, many series connections of pumps or parallel connections, improved water filling
Effect.
Advance Water Injection distance choosing is determined according to the experiment of coal body wellability and the lower coal petrography mechanical characteristic experiment of waterpower even summation effect
Take in 200m.
The water filling of this hard coal seam weakens experimental provision and its application method due to blocking fracturing equipment provided with both-end, and both-end is sealed
Stifled fracturing equipment includes packer 1, and packer 1 includes the external packer along its length provided with flexible connection that is being spaced apart
With interior packer, therefore by after external packer and interior packer pressurising between external packer and interior packer packing section i.e. formed
Confined space, insulates the coal body in section, it is possible to resolve often occur during deep hole high pressure water injection by the water filling fracturing of high pressure water-injection pump 4
Can not pressurize technical barrier, be that the infiltration of follow-up coal seam low pressure creates condition, simple in construction, flood effectiveness is good, can realize
Water injection to keep pressure is to ensure that low pressure infiltrates, so as to effectively weaken coal seam, reduction pick consumption, fundamentally solve harder
The problem of mechanical mining being used in coal seam.
It is readily apparent that the description and record of the above are only illustrated in the disclosure being not intended to be limiting of the invention
Hold, using or use.Although being described in embodiment and embodiment being described in the drawings, the present invention is not limited
By accompanying drawing example and described in embodiment as it is now recognized that optimal mode to implement the particular case of the teachings of the present invention
Son, the scope of the present invention is by any embodiment including falling into description and appended claims above.
Claims (7)
1. a kind of hard coal seam water filling weakens experimental provision, it is characterised in that including orifice tube (2), both-end closure fracturing equipment, height
Pressure injection water pipe (3), high pressure water-injection pump (4), high-pressure manometer (5), low pressure hose (6), filter (7) and suction hose；
The fixedly sleeved outer end installed in coal bed drilling of the orifice tube (2)；
The both-end closure fracturing equipment is arranged in coal bed drilling, and both-end closure fracturing equipment includes packer (1), packer (1)
Including the external packer and interior packer along its length provided with flexible connection that is being spaced apart；External packer is annular empty
Pericardium structure, annular hollow capsule structure, which is provided with, removably includes the high-pressure nylon pipe of high pressure valve；Interior packer is end cap
It also is provided with removably including the high-pressure nylon pipe of high pressure valve in the hollow capsule structure of shape, the hollow capsule structure of end cap shape；
One end of the high pressure water injection pipe (3) penetrates orifice tube and stretches in coal bed drilling and both-end closure fracturing equipment outer end
The port of export of the closed connection connection of external packer annular center, the other end and high pressure water-injection pump (4) is connected, high pressure water-injection pump (4)
The port of export on be additionally provided with high-pressure manometer (5)；
One end of described low pressure hose (6) is connected with the arrival end of high pressure water-injection pump (4), the other end and filter (7) go out
The connection of mouth end；
The arrival end of described filter (7) and one end of suction hose are connected, and the other end of suction hose submerges the liquid of pond (11)
Below face.
2. hard coal seam water filling as claimed in claim 1 weakens experimental provision, it is characterised in that：The suction hose is provided with low
Pressure pressure table (8), flowmeter (9) and stop valve (10).
3. hard coal seam water filling as claimed in claim 1 or 2 weakens the application method of experimental provision, it is characterised in that comprising such as
Lower step：
A) test hole site is determined：Drill through coal bed drilling and rower of going forward side by side draws, situation in inspection hole, determine that nothing has been caved in hole
It is good, unimpeded；
B) hole external packer applied voltage test：Packer (1), high-pressure nylon pipe and high pressure water-injection pump (4) are sequentially connected, outside hole
Applied voltage test is carried out, packer (1) is packaged with sleeve pipe first, then startup high pressure water-injection pump (4) gives external packer and interior respectively
Packer pressurizes, and checks whether packer inflation and pipeline sealing are good, and observation high-pressure manometer (5) reaches most in pressure process
During whole test pressure, confirm packer (1) and pipeline be functional, No leakage, otherwise overhauled or exchanged part, repeatedly this
Step, until reaching requirement；
C) packer is inserted：Interior packer and external packer are pushed into successively with drilling rod to need the setting position of test in coal bed drilling
Put, require that sealing is tightened between drilling rod thread during push-in packer (1), while to prevent the height being connected with packer (1)
Pressure nylon tube is extruded damage；
D) packer pressurizes in hole：Pressure gauge and connection member are connected first and confirms good seal, being connected with packer (1)
High-pressure nylon pipe and high pressure water-injection pump (4) be attached, open high pressure valve, then give packer (1) pressurization, pressure process
Middle attention high-pressure manometer (5) pressure change, when reaching packing setting pressure, confirms packer (1) and pipeline is functional, nothing
After leakage, close high pressure valve and dismantling high pressure valve makes it be separated with high pressure water-injection pump (4)；
E) hydrofracturing：After the packing of the hole section to be tested, low pressure gauge (8) and flowmeter (9) are connected, high pressure injection is confirmed
Water pump (4) operating position is correct, recording flowmeter initial reading and time, starts high pressure water-injection pump (4) and test section is added
Pressure experiment；Recording flowmeter reading and time during off-test；
F) it is completed, closes power supply, opens the high pressure valve being connected with high-pressure nylon pipe, treat that the water in packer (1) is complete
Packer (1) is pulled after outflow to another position that need to be tested on coal bed drilling outside direction, second is carried out and tests；With
This analogizes, until completing whole section of test of the coal bed drilling, closes power supply, detaching pipelines and instrument, withdraws from both-end closure pressure break
Device, proceeds the hydrofracturing work in other holes.
4. application method according to claim 3, it is characterised in that in described step e) in test process, high pressure injection
Water pump (4) is pressurizeed with maximum stream flow, pressure is pressurized to for the first time is raised to pressure value after maximum and fall after rise to setting value and protect
Setting time is depressed into, then stops being forced into setting time, last release；Pressure is pressurized to for the second time is raised to pressurize after maximum
To setting time.
5. application method according to claim 3, it is characterised in that when the hydrofracturing work for completing multiple coal bed drillings
Afterwards, each coal bed drilling orifice part is attached and by switching valve with high-voltage tube while being connected on high pressure water-injection pump (4)
Carry out porous hydraulic fracturing work.
6. application method according to claim 3, it is characterised in that Advance Water Injection distance is 200m.
7. application method according to claim 3, it is characterised in that from coal bed drilling bottom outward direction using 30m as an envelope
Compartment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657108.1A CN107290223B (en) | 2017-08-03 | 2017-08-03 | Use method of hard coal seam water injection weakening experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657108.1A CN107290223B (en) | 2017-08-03 | 2017-08-03 | Use method of hard coal seam water injection weakening experimental device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107290223A true CN107290223A (en) | 2017-10-24 |
| CN107290223B CN107290223B (en) | 2020-08-21 |
Family
ID=60104303
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710657108.1A Active CN107290223B (en) | 2017-08-03 | 2017-08-03 | Use method of hard coal seam water injection weakening experimental device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632577A (en) * | 2019-02-20 | 2019-04-16 | 自然资源部第海洋研究所 | A kind of cut-pff wall defective locations detection device and detection method |
| CN110242270A (en) * | 2019-07-01 | 2019-09-17 | 重庆大学 | A kind of coal gas reservoir hydraulic fracture method pressed after elder generation is bored |
| CN110821491A (en) * | 2019-11-10 | 2020-02-21 | 徐州秩润矿山设备科技有限公司 | Wireless control's coal seam high pressure water injection car |
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| CN1062974A (en) * | 1990-12-25 | 1992-07-22 | 山东矿业学院 | Boring subsection water injection, the inflation technology of leaking hunting |
| CN105547721A (en) * | 2015-12-09 | 2016-05-04 | 山东科技大学 | Double-end blocking and leakage detection integrated observation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062974A (en) * | 1990-12-25 | 1992-07-22 | 山东矿业学院 | Boring subsection water injection, the inflation technology of leaking hunting |
| CN105547721A (en) * | 2015-12-09 | 2016-05-04 | 山东科技大学 | Double-end blocking and leakage detection integrated observation method |
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| 熊晓英等: "注水实验法探测导水裂隙带高度", 《煤炭技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632577A (en) * | 2019-02-20 | 2019-04-16 | 自然资源部第海洋研究所 | A kind of cut-pff wall defective locations detection device and detection method |
| CN109632577B (en) * | 2019-02-20 | 2021-07-16 | 自然资源部第一海洋研究所 | Impervious wall defect position detection device and detection method |
| CN110242270A (en) * | 2019-07-01 | 2019-09-17 | 重庆大学 | A kind of coal gas reservoir hydraulic fracture method pressed after elder generation is bored |
| CN110821491A (en) * | 2019-11-10 | 2020-02-21 | 徐州秩润矿山设备科技有限公司 | Wireless control's coal seam high pressure water injection car |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107290223B (en) | 2020-08-21 |
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