CN111828082A - Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive - Google Patents
Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive Download PDFInfo
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- CN111828082A CN111828082A CN202010706640.XA CN202010706640A CN111828082A CN 111828082 A CN111828082 A CN 111828082A CN 202010706640 A CN202010706640 A CN 202010706640A CN 111828082 A CN111828082 A CN 111828082A
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- 239000002360 explosive Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 63
- 239000003245 coal Substances 0.000 title claims abstract description 58
- 238000000605 extraction Methods 0.000 title claims abstract description 42
- 239000000126 substance Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000035699 permeability Effects 0.000 title claims abstract description 19
- 238000005422 blasting Methods 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 8
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- 239000012046 mixed solvent Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004880 explosion Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 206010017076 Fracture Diseases 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a coal seam permeability increasing method with the cooperation of chemical extraction and liquid explosives, which comprises the following steps: firstly, constructing a drill hole in a coal seam, feeding a grouting pipe and a slurry return pipe into the drill hole, and plugging an orifice; after hole sealing is finished, injecting an organic extractant into the drilled hole to perform extraction operation; after the extraction operation is finished, injecting liquid explosive and tracer; when the liquid explosive is recovered, the permeation operation of the explosive is completed, and the blasting operation is carried out. The method firstly carries out chemical extraction operation on the coal bed, removes soluble micromolecules and impurities in cracks and pores, widens a crack system, increases the diffusion range of the liquid explosive, and then fully utilizes the fluidity characteristic of the liquid explosive to ensure that the liquid explosive is fully permeated and diffused in the coal body crack system to form a permeation area, thereby greatly improving the influence range and the blasting effect of the blasting operation. Meanwhile, the explosive explosion can also induce the extraction agent to explode, thereby improving the explosion power and simultaneously removing the residual agent in the coal bed.
Description
Technical Field
The invention particularly relates to a coal seam permeability increasing method with cooperation of chemical extraction and liquid explosives, and relates to the technical field of coal mine underground gas extraction and coal seam permeability increasing.
Background
Most of coal mines mined at the present stage in China are high gas mines, so the underground gas extraction effect greatly influences the production efficiency of the mines. Along with the continuous deepening of the coal mining depth in China, the restriction of the coal bed permeability on gas extraction is more and more serious, and a good coal bed permeability-increasing technology becomes a necessary technology for coal mine deep mining.
Blasting permeability improvement is a coal bed permeability improvement means which is commonly used at present, but the technology has a plurality of defects, firstly, if the hole sealing effect of the drill hole is not good, most of blasting shock waves can impact towards the roadway along the drill hole, and the blasting effect is greatly weakened; secondly, the blasting action range is mainly concentrated in a small range around the drill hole, and the development influence on the crack is difficult to guarantee.
Disclosure of Invention
The invention aims to provide a coal bed permeability increasing method with the cooperation of chemical extraction and liquid explosives, which is simple and convenient to operate and high in efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a coal seam permeability increasing method with cooperation of chemical extraction and liquid explosives comprises the following steps:
a. firstly, constructing a blasting drill hole from a roadway into a coal seam, and feeding a grouting pipe and a slurry return pipe into the blasting drill hole after construction is finished, wherein the grouting pipe and the slurry return pipe respectively comprise a front section and a tail section, the front section and the tail section are detachably connected into a whole through a connector, the connector is provided with a valve, and the front end of the slurry return pipe reaches the bottom of the blasting drill hole; the exposed end of the grouting pipe is connected with one end of a liquid pump, the other end of the liquid pump is respectively connected with an extraction agent storage tank and an explosive mixing device through a tee joint, the other end of the explosive mixing device is respectively connected with a liquid explosive storage tank and a tracer agent storage tank, and the exposed end of the grout returning pipe is connected with a liquid recovery device and is plugged at an orifice;
b. after hole sealing operation is completed, a valve on the connector is opened, a liquid pump is started, an organic extracting agent is injected into the blasting drill hole, extraction operation is carried out, and a fracture system in the coal seam is expanded;
c. after the extraction operation is finished, firstly, introducing the liquid explosive and the tracer agent into an explosive mixing device for fully mixing, then injecting the liquid explosive and the tracer agent into the blasting drill hole from a grouting pipe, filling the blasting drill hole with the explosive and permeating the explosive into a fracture system, and forming an explosive permeation area in the coal bed;
d. when the liquid explosive is recovered in the liquid recovery device, indicating that the explosive permeation operation is finished, closing the liquid pump and valves on the connector, taking down the tail sections of the slurry return pipe and the grouting pipe, evacuating personnel, and performing blasting operation.
Preferably, the organic extractant is a mixed solvent of N-methylpyrrolidone and tetrahydrofuran.
Preferably, the tracer is a mixture of a fluorescent powder and a water-soluble tracer.
Preferably, the content of the tracer in the explosive mixing device is 5-6%.
Preferably, the diameter of the blast drill hole is 18-22 cm.
Preferably, the distance between the exposed ends of the grouting pipe and the slurry return pipe and the orifice is 0.1 m.
Compared with the prior art, the coal bed permeability increasing method combining chemical extraction and liquid explosives optimizes the traditional blasting process under a coal mine, firstly performs chemical extraction operation on the coal bed, extracts coal bodies by using an extraction agent, removes soluble micromolecules and impurities in cracks and pores, widens a crack system, and increases the diffusion range of the liquid explosives. And then, the fluidity characteristic of the liquid explosive is fully utilized, so that the liquid explosive is fully permeated and diffused in a coal body fracture system to form a permeation area. Then when the explosive is detonated, most of the explosive shock waves act on the coal fracture system, so that the energy loss is reduced, and the influence range and the blasting effect of blasting operation are greatly improved. Meanwhile, the explosive explosion can also induce the extraction agent to explode, thereby not only improving the explosion power, but also achieving the effect of removing the residual agent in the coal bed.
Drawings
The invention is described in further detail below with reference to the figures and specific examples.
FIG. 1 is a schematic diagram of a coal bed permeability increasing method combining chemical extraction and liquid explosive.
FIG. 2 is a schematic view of the connection of the grouting pipe and the slurry return pipe in the embodiment of the invention.
In the figure: 1-roadway, 2-coal bed, 3-blasting drilling, 4-grouting pipe, 5-mud returning pipe, 6-liquid recovery device, 7-liquid pump, 8-extracting agent storage box, 9-explosive mixing device, 10-liquid explosive storage box, 11-tracer storage box, 12-hole packer, 13-explosive penetration area, 14-crack system, 15-connector, 16-front section and 17-tail section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
As shown in figure 1, the invention provides a coal seam permeability increasing method combining chemical extraction and liquid explosive, which comprises the following steps:
a. firstly, constructing a 20 cm-diameter blasting borehole 3 into a coal seam 2 from a roadway 1, feeding a grouting pipe 4 and a slurry return pipe 5 into the blasting borehole 3 after the construction is finished, wherein the front end of the slurry return pipe 5 reaches the bottom of the blasting borehole 3, and the distances between the exposed ends of the grouting pipe 4 and the slurry return pipe 5 and an orifice are both 0.1m, and the length is enough for installing a subsequent device and cannot hinder the work of personnel in the roadway; the exposed end of the grouting pipe 4 is connected with one end of a liquid pump 7 through a high-pressure rubber pipe, the other end of the liquid pump 7 is respectively connected with an extraction agent storage tank 8 and an explosive mixing device 9 through a tee joint, the other end of the explosive mixing device 9 is respectively connected with a liquid explosive storage tank 10 and a tracer agent storage tank 11, the exposed end of the grout return pipe 5 is connected with a liquid recovery device 6, and a hole packer 12 is used for plugging a hole;
as shown in fig. 2, the grouting pipe 4 and the slurry return pipe 5 are divided into 3 parts: connector 15, front section 16 and tail section 17. The front section 16 and the tail section 17 are respectively detachably connected to the connector 15, and meanwhile, a valve is mounted on the connector 15 and can control opening and closing of a pipeline.
b. After hole sealing operation is completed, a valve on the connector 15 is opened, the liquid pump 7 is started, an extraction agent is injected into the blasting drill hole 3, extraction operation is carried out, and a fracture system 13 in the coal seam 2 is expanded; monitoring the coal body fractures in real time by using an ultrasonic flaw detector, and finishing extraction when the development degree of the coal bed fractures reaches an ideal state;
the chemical agent used in this example is an organic extractant, and one preferable chemical agent component is a mixed reagent of N-methylpyrrolidone and tetrahydrofuran. The chemical extraction agent can react with soluble micromolecules and impurities in the coal body to strip the soluble micromolecules and the impurities from the coal body, so that the effects of dredging pores of the coal body and expanding cracks of the coal body are achieved, the diffusion range of the liquid explosive is increased, and the blasting effect is improved.
c. After the extraction operation is finished, firstly, introducing the liquid explosive and the tracer agent into an explosive mixing device 9 for fully mixing, wherein the content of the tracer agent is about 5%, then injecting the liquid explosive and the tracer agent into the blasting drill hole 3 from a grouting pipe 4, filling the blasting drill hole 3 with the explosive and permeating the explosive into a fracture system 13, and forming an explosive permeation area 14 in the coal seam 2;
the liquid explosive can be formed by improving a conventional slurry explosive or water gel explosive, and the conventional slurry explosive or water gel explosive has high power and is easy to affect a roadway.
The tracer is used for tracking the flow direction of the liquid explosive, judging whether blasting operation damages a roadway or not and observing whether the explosive remains or not after the blasting operation is finished. The tracer used in the embodiment is a mixture of fluorescent powder and a water-soluble tracer, so that explosive distribution in the coal seam can be monitored by using tracking equipment, and meanwhile, if explosive permeates to the vicinity of the wall of the roadway, the explosive can be observed by naked eyes. The safety of the operation can be effectively improved.
d. When the liquid explosive is recovered in the liquid recovery device 6, indicating that the explosive permeation operation is finished, closing valves on the liquid pump 7 and the connector 15, and taking down the slurry return pipe 5 and the tail section 17 of the grouting pipe 4; finally, evacuating the personnel and carrying out blasting operation.
The explosive recovery device 6 is used for recovering redundant liquid explosives flowing back from the slurry return pipe 5 and preventing the liquid explosives from scattering into the roadway 1, thereby playing a certain economic and safety role.
The single solvent extraction measure is a difficult and complicated step, and residual solvent in the coal seam needs to be removed after the extraction operation is finished; and in the single explosive blasting, because the primary fractures of the coal bed are less, the penetration range of the explosive is smaller, and the blasting effect is difficult to ensure. The method comprises the steps of firstly carrying out chemical solvent extraction operation on a coal bed, extracting a coal body by an extraction agent, removing soluble micromolecules and impurities in cracks and pores, expanding the crack development of the coal body, widening a crack system and providing a flow channel for explosive penetration; and then the liquid explosive is fully utilized to fully permeate and diffuse in the coal body fracture system to form a permeable area, when the liquid explosive is detonated, most of the detonation shock waves act on the coal body fracture system, the energy loss is reduced, and the influence range and the blasting effect of blasting operation are greatly improved. Meanwhile, the explosive explosion can also induce the extraction agent to explode, thereby not only improving the explosion power, but also achieving the effect of removing the residual agent in the coal bed. Therefore, the method combines the extraction of the chemical solvent and the blasting of the liquid explosive, obviously improves the anti-reflection effect after the superposition, and is simple and efficient.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.
Claims (6)
1. A coal seam permeability increasing method with cooperation of chemical extraction and liquid explosives is characterized by comprising the following steps:
a. firstly, constructing a blasting drill hole (3) from a roadway (1) into a coal seam (2), and feeding a grouting pipe (4) and a slurry return pipe (5) into the blasting drill hole (3) after construction is finished, wherein the grouting pipe (4) and the slurry return pipe (5) respectively comprise a front section (16) and a tail section (17), the front section (16) and the tail section (17) are detachably connected into a whole through a connector (15), a valve is arranged on the connector (15), and the front end of the slurry return pipe (5) reaches the bottom of the blasting drill hole (3); the exposed end of the grouting pipe (4) is connected with one end of a liquid pump (7), the other end of the liquid pump (7) is respectively connected with an extraction agent storage tank (8) and an explosive mixing device (9) through a tee joint, the other end of the explosive mixing device (9) is respectively connected with a liquid explosive storage tank (10) and a tracer agent storage tank (11), the exposed end of the grout return pipe (5) is connected with a liquid recovery device (6), and an orifice is blocked;
b. after hole sealing operation is finished, a valve on the connector (15) is opened, a liquid pump (7) is started, an organic extracting agent is injected into the blasting drill hole (3), extraction operation is carried out, and a fracture system (13) in the coal seam (2) is expanded;
c. after extraction operation is finished, firstly, liquid explosives and tracers are introduced into an explosive mixing device (9) to be fully mixed, then the mixture is injected into the blasting drill hole (3) from a grouting pipe (4), the explosives are filled in the blasting drill hole (3) and permeate into a fracture system (13), and an explosive permeation area (14) is formed in the coal seam (2);
d. when the liquid explosive is recovered in the liquid recovery device (6), indicating that the penetration operation of the explosive is finished, closing the liquid pump (7) and valves on the connector (15), taking down the slurry return pipe (5) and the tail section (17) of the grouting pipe (4), evacuating personnel, and carrying out blasting operation.
2. The method for increasing the permeability of the coal bed by the synergy of chemical extraction and liquid explosives in claim 1, wherein the organic extraction agent is a mixed solvent of N-methylpyrrolidone and tetrahydrofuran.
3. The method for increasing the permeability of the coal bed by combining chemical extraction and liquid explosive according to claim 1, wherein the tracer is a mixture of fluorescent powder and a water-soluble tracer.
4. The coal bed permeability increasing method combining chemical extraction and liquid explosive according to claim 1, wherein the content of the tracer in the explosive mixing device (9) is 5-6%.
5. A coal bed permeability increasing method by combining chemical extraction and liquid explosive according to claim 1, characterized in that the diameter of the blast borehole (3) is 18-22 cm.
6. The method for increasing the permeability of the coal bed by combining chemical extraction and liquid explosive according to claim 1, wherein the distance between the exposed ends of the grouting pipe (4) and the slurry return pipe (5) and the orifice is 0.1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706640.XA CN111828082B (en) | 2020-07-21 | 2020-07-21 | Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010706640.XA CN111828082B (en) | 2020-07-21 | 2020-07-21 | Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive |
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| Publication Number | Publication Date |
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| CN111828082A true CN111828082A (en) | 2020-10-27 |
| CN111828082B CN111828082B (en) | 2021-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187536A (en) * | 2021-04-21 | 2021-07-30 | 山东科技大学 | Retreating type coal seam hydraulic reaming cave-making permeability-increasing device and permeability-increasing method |
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| CN107725020A (en) * | 2017-11-14 | 2018-02-23 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
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| CN110714738A (en) * | 2019-09-24 | 2020-01-21 | 刘德成 | Supercritical carbon dioxide coal body extraction and deep hole uncoupled loaded carbon dioxide medium pressure relief blasting gas treatment method and device |
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2020
- 2020-07-21 CN CN202010706640.XA patent/CN111828082B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB862935A (en) * | 1958-11-11 | 1961-03-15 | Electric Hose Rubber Co | Improvements in or relating to infusion seals for use in mining operations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113187536A (en) * | 2021-04-21 | 2021-07-30 | 山东科技大学 | Retreating type coal seam hydraulic reaming cave-making permeability-increasing device and permeability-increasing method |
| CN113187536B (en) * | 2021-04-21 | 2022-07-19 | 山东科技大学 | Retreating type coal seam hydraulic reaming cave-making permeability-increasing device and permeability-increasing method |
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