CN103993901B - A kind of projecting coal bed drilling waterpower is handled up anti-reflection method - Google Patents
A kind of projecting coal bed drilling waterpower is handled up anti-reflection method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 65
- 238000005553 drilling Methods 0.000 title claims abstract description 28
- 238000001028 reflection method Methods 0.000 title claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
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- 238000012163 sequencing technique Methods 0.000 claims 14
- 238000006073 displacement reaction Methods 0.000 claims 4
- 239000003250 coal slurry Substances 0.000 claims 3
- 239000012141 concentrate Substances 0.000 claims 1
- 238000000605 extraction Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 65
- 239000002002 slurry Substances 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000000638 stimulation Effects 0.000 abstract 2
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000009747 swallowing Effects 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
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Abstract
一种突出煤层钻孔水力吞吐增透方法。通过水力吞吐，在钻孔周围煤体形成高速流动水体，携带出粉煤与瓦斯，提高瓦斯抽放效果。钻孔施工完成后，安装供排液管路，采用初始供液压力供液使钻孔周围煤体致裂。而后关闭供液系统，开启排液系统，根据煤水浆和瓦斯浓度确定最大和最小临界压力，将最大临界压力设置为供液程控阀关闭压力和排液程控阀开启压力，将最小临界压力设置为供液程控阀开启压力和排液程控阀关闭压力，由数字压力表数值实时控制两个程控阀的开启和关闭，实现钻孔周围煤体的程控水力吞吐操作。当煤水浆和瓦斯浓度降到最低设定值时，提高最大临界压力，重新进行水力吞吐操作，直到提高最大临界压力不能明显改变煤水浆和瓦斯浓度为止。
A hydraulic huff and puff permeability enhancement method for boreholes in outburst coal seams. Through hydraulic stimulation, a high-speed flowing water body is formed around the coal body around the borehole, carrying out pulverized coal and gas, and improving the gas drainage effect. After the drilling construction is completed, the liquid supply and drainage pipelines are installed, and the initial liquid supply pressure is used to supply the liquid to crack the coal around the borehole. Then close the liquid supply system, open the liquid discharge system, determine the maximum and minimum critical pressures according to the concentration of coal-water slurry and gas, set the maximum critical pressure as the closing pressure of the liquid supply program-controlled valve and the opening pressure of the liquid discharge program-controlled valve, and set the minimum critical pressure The opening pressure of the program-controlled valve for liquid supply and the closing pressure of the program-controlled valve for draining liquid are used to control the opening and closing of the two program-controlled valves in real time by the value of the digital pressure gauge, so as to realize the program-controlled hydraulic throughput operation of the coal body around the borehole. When the coal-water slurry and gas concentration drop to the minimum set value, increase the maximum critical pressure, and re-operate hydraulic stimulation until the increase of the maximum critical pressure cannot significantly change the coal-water slurry and gas concentration.
Description
技术领域technical field
本发明涉及一种突出煤层钻孔水力吞吐增透方法,尤其是松软煤层的钻孔增透、消突、减尘的方法。The invention relates to a hydraulic huff-and-puff enhancement method for drilling holes in outburst coal seams, in particular to methods for increasing penetration, reducing outbursts and reducing dust in drilling holes in soft coal seams.
背景技术Background technique
随着煤炭开采机械化程度的提高，煤矿生产中的瓦斯和煤尘问题越来越突出，煤与瓦斯突出是煤矿生产中一种严重的自然灾害，煤尘在达到一定浓度时也会发生爆炸，而且会导致煤矿工人患上尘肺病，对煤矿工人的安全和健康带来严重威胁。因此，如何解决煤矿生产中煤与瓦斯突出和煤尘超标是煤矿安全生产中的重要课题。With the improvement of coal mining mechanization, the problem of gas and coal dust in coal mine production is becoming more and more prominent. Coal and gas outburst is a serious natural disaster in coal mine production. Coal dust will also explode when it reaches a certain concentration. And it will cause coal miners to suffer from pneumoconiosis, which poses a serious threat to the safety and health of coal miners. Therefore, how to solve coal and gas outburst and coal dust exceeding the standard in coal mine production is an important issue in coal mine safety production.
针对如此现象，煤炭行业采取如下防治措施：（1）煤层抽放瓦斯，即经过负压抽采释放煤层中瓦斯，降低瓦斯压力与瓦斯含量, 防止煤与瓦斯突出事故发生；（2）水力压裂，即向煤层高压注水，迫使煤层产生裂隙，增加透气性，而后诱导煤层中气体排出，减小煤层瓦斯压力和瓦斯含量，预防煤与瓦斯突出或冲击地压的发生。同时又起到防尘、防自然发火的作用。In response to this phenomenon, the coal industry has adopted the following prevention and control measures: (1) Drain gas from coal seams, that is, release gas in coal seams through negative pressure drainage, reduce gas pressure and gas content, and prevent coal and gas outburst accidents; (2) Hydraulic pressure Cracking, that is, high-pressure water injection into the coal seam, forcing the coal seam to form cracks, increasing the air permeability, and then inducing the gas in the coal seam to discharge, reducing the gas pressure and gas content of the coal seam, and preventing coal and gas outburst or rock burst. At the same time, it also plays the role of dustproof and anti-spontaneous ignition.
目前，煤层注水在预防煤与瓦斯突出事故中取得了一定程度的效果，但是该技术仍然存在一定的盲目性。在进行高地应力条件下突出煤层钻孔水压致裂增透时，当水体压力降低后，张开的裂隙空隙在地应力作用下重新闭合，无法维持裂隙空隙的张开状态，因此，很难取得增透的效果。当用砂粒等材料维持裂隙空隙存在时，由于松软煤体结构强度低，无法经受砂粒集中应力的作用而发生破坏调整，最终还是不能取得满意的增透效果。At present, coal seam water injection has achieved a certain degree of effect in preventing coal and gas outburst accidents, but this technology still has a certain degree of blindness. When carrying out hydraulic fracturing and anti-permeability enhancement of outburst coal seam drilling under high in-situ stress conditions, when the water pressure decreases, the open fissures will reclose under the in-situ stress, and the open state of the fissures cannot be maintained. Therefore, it is difficult Obtain the effect of increasing transparency. When sand and other materials are used to maintain the existence of cracks and voids, due to the low structural strength of the soft coal body, it cannot withstand the concentrated stress of sand particles and damage adjustments occur, and finally a satisfactory anti-reflection effect cannot be obtained.
发明内容Contents of the invention
本发明一种突出煤层钻孔水力吞吐增透方法,旨在针对已有技术中存在的问题，以清洗煤体中粉煤、保留煤体中强度较高块煤的思路，提供一种方法简单，操作方便，控制性好，安全可靠，效果好的煤与瓦斯突出防治及减尘一体化的方法。The present invention is a hydraulic huff-puff anti-permeability method for outburst coal seam drilling, aiming at the problems existing in the prior art, with the idea of cleaning the pulverized coal in the coal body and retaining the high-strength lump coal in the coal body, and provides a simple method , easy to operate, good controllability, safe and reliable, effective coal and gas outburst prevention and dust reduction integrated method.
本发明的目的是这样实现的：一种突出煤层钻孔水力吞吐增透方法，包括钻孔、封孔、增压、吞吐等程序。实现该方法需要的装置包括：注液泵、排液泵、高压铝塑管、程控阀、三通阀、压力表、封孔器、带孔的高压胶管。The object of the present invention is achieved in the following way: a hydraulic huff and puff method for drilling outburst coal seams, including procedures such as drilling, sealing, boosting, and huffing. The devices required to realize the method include: a liquid injection pump, a liquid discharge pump, a high-pressure aluminum-plastic pipe, a program-controlled valve, a three-way valve, a pressure gauge, a hole sealing device, and a high-pressure rubber pipe with holes.
所述带孔的高压胶管放置于达到设计深度的钻孔中，孔口段用封孔器封孔，防止高压水或瓦斯从带孔高压胶管和孔壁之间的空隙流出。所述带孔高压胶管的小孔大小和间距可根据粉煤冲洗效果调整。The high-pressure rubber hose with holes is placed in the drilled hole reaching the designed depth, and the hole section is sealed with a hole sealer to prevent high-pressure water or gas from flowing out from the gap between the high-pressure rubber hose with holes and the hole wall. The size and spacing of the small holes of the high-pressure rubber hose with holes can be adjusted according to the pulverized coal flushing effect.
所述注液泵通过高压铝塑管、程控阀、三通阀向高压胶管供液、高压液体通过高压胶管小孔进入钻孔周围煤体，通过高压增加原煤裂隙或扩大煤体原有裂隙。The liquid injection pump supplies liquid to the high-pressure rubber hose through the high-pressure aluminum-plastic pipe, program-controlled valve, and three-way valve. The high-pressure liquid enters the coal body around the drill hole through the small hole of the high-pressure rubber hose, and increases the cracks in the raw coal or expands the original cracks in the coal body through high pressure.
所述排液泵通过高压铝塑管、程控阀、三通阀、高压胶管小孔从钻孔周围煤体中排液。The liquid drainage pump drains liquid from the coal body around the borehole through the high-pressure aluminum-plastic pipe, the program-controlled valve, the three-way valve, and the small hole of the high-pressure rubber hose.
所述排液泵为煤水泵。The liquid drainage pump is a coal water pump.
所述供液高压铝塑管、带孔高压胶管均可承受系统最大压力和最小负压。The high-pressure aluminum-plastic pipe for liquid supply and the high-pressure rubber hose with holes can both withstand the maximum pressure and the minimum negative pressure of the system.
本方法通过清洗煤体中的粉煤来增加钻孔周围煤体中的渗透性，钻孔周围煤体中水体经过高压胶管小孔向高压胶管内渗流时速度过慢则不利于携带出粉煤。高压水自动流出时，内外水头差衰减较快，水体流速也衰减较快，不利于粉煤的携带；另外，水体一直单向从高压胶管外向高压胶管内渗流，将导致高压胶管小孔的封堵，不利于后续粉煤的流出。因此，采用两个程控阀交替开启，注液泵和排液泵交替工作的办法，使小孔内外保持较大水头差，将水体维持在高速流动状态，而高速有利于粉煤的携带排出，而且由于水体从高压胶管小孔交替流入和流出，则不会长期封堵小孔。This method increases the permeability of the coal body around the drill hole by cleaning the pulverized coal in the coal body. When the water body in the coal body around the drill hole passes through the small hole of the high-pressure rubber hose and seeps into the high-pressure rubber hose, the speed is too slow, which is not conducive to carrying out the pulverized coal. . When the high-pressure water flows out automatically, the difference between the internal and external water head attenuates quickly, and the flow velocity of the water body also attenuates quickly, which is not conducive to the carrying of pulverized coal; in addition, the water body has been unidirectionally seeping from the outside of the high-pressure hose to the inside of the high-pressure hose, which will cause the small hole of the high-pressure hose to be sealed. Blockage is not conducive to the subsequent outflow of pulverized coal. Therefore, two program-controlled valves are alternately opened, and the liquid injection pump and the liquid discharge pump are alternately operated to maintain a large water head difference inside and outside the small hole, and maintain the water body in a high-speed flow state, and the high speed is conducive to the discharge of pulverized coal. Moreover, since water flows in and out alternately from the small holes of the high-pressure hose, the small holes will not be blocked for a long time.
在高压铝塑管安装数字压力表，该数字压力表数字可用于控制供液程控阀和排液程控阀；当高压铝塑管内压力达到较低临界值时，开启供液程控阀并关闭排液程控阀，由供液泵供液；当高压铝塑管内压力达到较高临界值时，开启排液程控阀并关闭供液程控阀，由排液泵排液。如此循环往复多次，直到排出煤水浓度较低，且瓦斯浓度较低时，可拆除钻孔外装置，将钻孔内高压胶管联入瓦斯抽排系统，进行瓦斯长期抽放。Install a digital pressure gauge on the high-pressure aluminum-plastic pipe, and the digital pressure gauge can be used to control the liquid supply program-controlled valve and the liquid discharge program-controlled valve; when the pressure in the high-pressure aluminum-plastic pipe reaches a lower critical value, open the liquid supply program-controlled valve and close the liquid discharge The program-controlled valve is supplied with liquid by the liquid supply pump; when the pressure in the high-pressure aluminum-plastic pipe reaches a higher critical value, the liquid discharge program-controlled valve is opened and the liquid supply program-controlled valve is closed, and the liquid is discharged by the liquid discharge pump. This cycle is repeated several times until the concentration of the discharged coal water is low and the gas concentration is low, the device outside the borehole can be removed, and the high-pressure hose in the borehole can be connected to the gas drainage system for long-term gas drainage.
抽出煤水浆及高浓度瓦斯由专用管道排出。The extracted coal-water slurry and high-concentration gas are discharged through special pipelines.
对于钻孔来说，供液泵供水和排液泵排水，就是吞水和突水，通过反复吞水和突水，排出钻孔周围煤体中粉煤颗粒，留下强度较高块煤，可以较容易保留下可作为瓦斯渗流通道的裂隙，提高煤体瓦斯抽采效率。For drilling, the water supply of the liquid supply pump and the drainage of the liquid drainage pump are water swallowing and water inrush. Through repeated water swallowing and water inrush, the pulverized coal particles in the coal body around the drilling hole are discharged, leaving high-strength lump coal. The cracks that can be used as gas seepage channels can be easily reserved, and the efficiency of coal gas drainage can be improved.
附图说明Description of drawings
图1是本发明的一种突出煤层钻孔水力吞吐增透方法示意图。Fig. 1 is a schematic diagram of a hydraulic huff and puff enhancement method for drilling outburst coal seams according to the present invention.
图中: 1为供液泵；2为供液高压铝塑管；3为供液程控阀； 4为三通阀；5为排液泵；6为排液高压铝塑管；7为排液程控阀；8为供排液高压铝塑管；9为数字压力表；10为带孔高压胶管；11为封孔器；12为钻孔；13为带孔高压胶管小孔；14为煤体。In the figure: 1 is the liquid supply pump; 2 is the high-pressure aluminum-plastic pipe for liquid supply; 3 is the program-controlled valve for liquid supply; 4 is the three-way valve; 5 is the liquid discharge pump; 6 is the high-pressure aluminum-plastic pipe for liquid discharge; 7 is the liquid discharge Program-controlled valve; 8 is high-pressure aluminum-plastic pipe for liquid supply and discharge; 9 is digital pressure gauge; 10 is high-pressure rubber hose with holes; 11 is sealing device; 12 is drilling; 13 is small holes for high-pressure rubber hose with holes; .
具体实施方式Detailed ways
下面结合附图和实施例对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
本发明提供了一种突出煤层钻孔水力吞吐增透方法。The invention provides a hydraulic huff and puff permeability enhancement method for boreholes in outburst coal seams.
如图1所示，本发明的具体步骤如下。As shown in Figure 1, the specific steps of the present invention are as follows.
（1）钻孔施工到设计深度后，取出钻杆，将带孔高压胶管10放入钻孔12内，并在孔口附近安装封孔器11，防止高压水从带孔高压胶管10与孔壁之间的空隙中流出。(1) After drilling to the design depth, take out the drill pipe, put the perforated high-pressure hose 10 into the drilled hole 12, and install a hole sealer 11 near the hole to prevent high-pressure water from flowing from the perforated high-pressure hose 10 to the hole. out of the space between the walls.
（2）连接钻孔外装置包括供液泵1、排液泵5、供液程控阀3、排液程控阀7、三通阀4、数字压力表9、供液高压铝塑管2、排液高压铝塑管6、供排液高压铝塑管8，并连接供排液高压铝塑管8与带孔高压胶管10。(2) Devices connected to the outside of the drilling include liquid supply pump 1, liquid discharge pump 5, liquid supply program-controlled valve 3, liquid discharge program-controlled valve 7, three-way valve 4, digital pressure gauge 9, liquid supply high-pressure aluminum-plastic pipe 2, drain Liquid high-pressure aluminum-plastic pipe 6, liquid supply and discharge high-pressure aluminum-plastic pipe 8, and connect liquid supply and discharge high-pressure aluminum-plastic pipe 8 with holed high-pressure rubber hose 10.
（3）关闭排液泵5和排液程控阀7，开启供液泵1和供液程控阀3，使钻孔12内水压增加，高压水通过带孔高压胶管小孔13进入钻孔周围煤体，在保持封孔器11有效的情况下，达到根据地应力情况设计的致裂压力，并稳定高压一段时间，使钻孔12周边煤体14的应力状态和裂隙网络保持不变。(3) Turn off the liquid discharge pump 5 and the liquid discharge program-controlled valve 7, turn on the liquid supply pump 1 and the liquid supply program-controlled valve 3, so that the water pressure in the borehole 12 increases, and the high-pressure water enters around the borehole through the small hole 13 of the high-pressure hose with holes The coal body, under the condition that the hole sealer 11 is kept effective, reaches the fracturing pressure designed according to the ground stress, and stabilizes the high pressure for a period of time, so that the stress state and fracture network of the coal body 14 around the borehole 12 remain unchanged.
（4）关闭供液泵1和供液程控阀3，开启排液泵5和排液程控阀7，抽出钻孔周围煤体中水体，若煤水浆浓度较高或瓦斯浓度较高，将供液程控阀3的开启压力和排液程控阀7的关闭压力定为开启排液泵后数字压力表9的最低压力，将排液程控阀7的开启压力和供液程控阀3的关闭压力定为开启供液泵后数字压力表9的最高压力，由数字压力表9的压力数值信号控制供液程控阀3和排液程控阀7，以实现钻孔周围煤体中水体的自动吞吐转换；直到煤水浆浓度和抽排瓦斯浓度都降低到设定值以下。(4) Close the liquid supply pump 1 and the liquid supply program-controlled valve 3, turn on the liquid discharge pump 5 and the liquid discharge program-controlled valve 7, and pump out the water in the coal body around the borehole. If the concentration of the coal-water slurry is high or the gas concentration is high, the The opening pressure of the liquid supply program-controlled valve 3 and the closing pressure of the liquid discharge program-controlled valve 7 are set as the minimum pressure of the digital pressure gauge 9 after the liquid discharge pump is turned on, and the opening pressure of the liquid discharge program-controlled valve 7 and the closing pressure of the liquid supply program-controlled valve 3 Set as the highest pressure of the digital pressure gauge 9 after the liquid supply pump is turned on, the pressure value signal of the digital pressure gauge 9 controls the liquid supply program-controlled valve 3 and the liquid discharge program-controlled valve 7, so as to realize the automatic throughput conversion of the water body in the coal body around the borehole ; Until the concentration of coal-water slurry and the concentration of exhausted gas are all reduced below the set value.
（5）若步骤（4）中煤水浆浓度和瓦斯浓度都较低，则进一步提高排液程控阀7的开启压力和供液程控阀3的关闭压力，重复步骤（3）和步骤（4）。(5) If the coal-water slurry concentration and gas concentration in step (4) are both low, further increase the opening pressure of the liquid discharge program-controlled valve 7 and the closing pressure of the liquid supply program-controlled valve 3, and repeat steps (3) and (4 ).
（6）当提高水压对排放钻孔周围煤粉和瓦斯效果没有明显提高时，则疏干钻孔水体，拆除钻孔外装置，将钻孔内带孔高压胶管联接到瓦斯抽放系统的瓦斯集中排放管。(6) When increasing the water pressure does not significantly improve the effect of discharging pulverized coal and gas around the borehole, drain the water body of the borehole, remove the device outside the borehole, and connect the high-pressure hose with holes in the borehole to the gas drainage system. Centralized gas discharge pipe.
（7）到下一个钻孔使用该方法时，重复步骤（1）~（6）。(7) When using this method for the next drilling, repeat steps (1)~(6).
以上所述，只是本发明的具体实施例，并非对本发明作出任何形式上的限制，在不脱离本发明的技术方案基础上，所作出的简单修改、等同变化或修饰，均落入本发明的保护范围。The above are only specific embodiments of the present invention, and do not make any formal restrictions on the present invention. On the basis of not departing from the technical solution of the present invention, any simple modifications, equivalent changes or modifications made fall within the scope of the present invention. protected range.
Claims (1)
- The anti-reflection method 1. a kind of projecting coal bed drilling waterpower is handled up, it is characterised in that include the following steps,A. drilling construction takes out drilling rod, by high-pressure rubber pipe with holes to after projected depth（10）It is put into drilling（12）It is interior, and in hole Installation hole packer near mouthful（11）, prevent high pressure water from high-pressure rubber pipe with holes（10）Flowed out in gap between hole wall；B. the outer device of connection drilling includes solution feed pump（1）, positive displacement pump（5）, feed flow sequencing valve（3）, discharge opeing sequencing valve（7）, threeway Valve（4）, digital pressure gauge（9）, feed flow high pressure aluminium-plastic pipe（2）, discharge opeing high pressure aluminium-plastic pipe（6）, for discharge opeing high pressure aluminium-plastic pipe（8）, And connect for discharge opeing high pressure aluminium-plastic pipe（8）With high-pressure rubber pipe with holes（10）；The feed flow high pressure aluminium-plastic pipe（2）, the high jewelling of discharge opeing Modeling pipe（6）, for discharge opeing high pressure aluminium-plastic pipe（8）, high-pressure rubber pipe with holes（10）System maximum pressure and minimum sub-atmospheric pressure can be born；C. positive displacement pump is closed（5）With discharge opeing sequencing valve（7）, open solution feed pump（1）With feed flow sequencing valve（3）, make drilling（12）It is interior Hydraulic pressure increase, high pressure water pass through high-pressure rubber pipe aperture with holes（13）Into drilling surrounding medium, hole packer is being kept（11）Effectively In the case of, reach the fracturing pressure designed according to crustal stress situation, and stable high voltage is for a period of time, makes drilling（12）Periphery coal Body（14）Stress state and Fracture Networks remain unchanged；D. solution feed pump is closed（1）With feed flow sequencing valve（3）, open positive displacement pump（5）With discharge opeing sequencing valve（7）, extraction drilling surrounding Water body in coal body, if coal slurry density or gas density are higher, by feed flow sequencing valve（3）Opening pressure and discharge opeing sequencing valve （7）Closing pressure be set to open positive displacement pump after digital pressure gauge（9）Minimum pressure, by discharge opeing sequencing valve（7）Unlatching pressure Power and feed flow sequencing valve（3）Closing pressure be set to open solution feed pump after digital pressure gauge（9）Maximum pressure, by digital pressure Table（9）Pressure value signal control feed flow sequencing valve（3）With discharge opeing sequencing valve（7）, to realize water body in the surrounding medium that drills Automatic conversion of handling up；Until coal slurry density and drawing-off gas concentration are all reduced to below setting value；If e. coal slurry density and gas density are all relatively low in step d, discharge opeing sequencing valve is further improved（7）Unlatching pressure Power and feed flow sequencing valve（3）Closing pressure, repeat step c and step d；F. when raising hydraulic pressure does not significantly improve coal dust around bleeder off hole and gas effect, then drainage drilling water body, tears open Except the outer device of drilling, the gas that high-pressure rubber pipe with holes in drilling is connected to gas drainage system concentrates delivery pipe；G. next drilling is arrived when using this method, repeat step a ~ f.
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| CN105909248B (en) * | 2016-04-27 | 2019-08-20 | 何满潮 | For the retaining wall attitude reference device of high-pressure water jet joint-cutting, water jet drilling joint-cutting device and method |
| CN106930746B (en) * | 2017-03-06 | 2019-06-04 | 中国矿业大学 | Alternate Coal Seam Permeability Enhancement Method Combined with Drilling Acetone Invasion and Hydraulic Fracturing |
| CN113654969A (en) * | 2021-08-31 | 2021-11-16 | 西南石油大学 | A device and method for evaluating the effect of fluid huff and puff for tight oil and gas |
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