CN112727403B - Soft coal gas extraction drilling and injection inhibiting method with cooperation of bottom plate slot and acid invasion - Google Patents
Soft coal gas extraction drilling and injection inhibiting method with cooperation of bottom plate slot and acid invasion Download PDFInfo
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- CN112727403B CN112727403B CN202110010884.9A CN202110010884A CN112727403B CN 112727403 B CN112727403 B CN 112727403B CN 202110010884 A CN202110010884 A CN 202110010884A CN 112727403 B CN112727403 B CN 112727403B
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- 239000002253 acid Substances 0.000 title claims abstract description 77
- 238000000605 extraction Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 title claims abstract description 20
- 239000003034 coal gas Substances 0.000 title claims abstract description 13
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 11
- 238000002347 injection Methods 0.000 title claims description 18
- 239000007924 injection Substances 0.000 title claims description 18
- 230000009545 invasion Effects 0.000 title claims description 10
- 239000003245 coal Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 239000011435 rock Substances 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 8
- 239000002817 coal dust Substances 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- -1 iron ion Chemical class 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 239000004579 marble Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000020477 pH reduction Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a soft coal gas extraction drilling hole spray inhibiting method with cooperation of base plate slotting and acid cutting, wherein a slot is formed below a coal bed through base plate drilling and hydraulic slotting, and a rock breaking zone is formed between the slot and the coal bed; injecting acid liquor into the slot, continuously eroding the rock in the rock breaking zone by the acid liquor, finally forming an acid-eroded crack in the rock breaking zone, forming a passage between the coal bed and the slot, and acidizing the coal bed by the acid liquor entering the passage, thereby effectively promoting gas desorption; in addition, the formed slot not only increases the contact area of the acid liquid and the rock fracture zone, creates a reaction space for acidizing and erosion, but also provides a pressure relief space for the coal dust to gush out under the action of ground stress and gas pressure; the phenomenon that the soft coal gas extraction drill hole is sprayed is effectively inhibited, and the safety of gas extraction is greatly improved; meanwhile, the acid liquor after the reaction can not be remained in the coal body to influence the follow-up exploitation.
Description
Technical Field
The invention relates to a soft coal gas extraction drill hole spray inhibiting method, in particular to a soft coal gas extraction drill hole spray inhibiting method with cooperation of bottom plate slotting and acid invasion.
Background
Gas extraction is a key technology for controlling gas disasters, and more than 80% of coal seams in China have the characteristics of high gas, low permeability, microporosity and strong adsorption, so that the gas extraction amount is low and the extraction cost is high. At present, students at home and abroad propose methods of hydraulic cutting and acidizing fracturing to increase coal seam fractures so as to improve gas extraction efficiency and eliminate coal seam outburst danger. However, the existing hydraulic slotting technology is easy to generate a water lock effect, so that the gas extraction rate of a coal seam cannot be improved; in addition, the contact area of the acid liquid and the coal body is small, the acidification effect is limited, and the original fracture and porosity of the coal body are reduced along with the increase of the coal mining depth, so that the expected effect is difficult to achieve by only depending on the acidification fracturing method. In addition, in the prior art, hydraulic cutting is adopted in the coal seam to form gaps, and then acid liquor is injected into the gaps for acidification treatment, so that the desorption effect of coal seam gas is improved, and the gas extraction efficiency is improved; however, the soft coal seam is damaged in such a way, and because the soft coal seam has poor supporting effect, the gap can be quickly closed under the action of stress in the soft coal seam, so that the acid liquor injection process cannot be continuously carried out; meanwhile, the acid liquor is directly injected into the coal bed and remains in the coal bed, so that part of unreacted acid liquor can influence the follow-up exploitation of the coal bed.
Therefore, how can guarantee that acidizing fluid and coal body increase area of contact improve gas desorption effect to the acidizing fluid can not remain in the coal body and cause the influence to follow-up exploitation, can also effectively restrain the buggy orifice phenomenon of gas drainage drilling simultaneously, is the technical problem that needs to solve urgently of this trade.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a soft coal gas extraction drilling and injection inhibiting method with cooperation of base plate slot and acid invasion, which can increase the contact area of acid liquor and coal body to improve the gas desorption effect, and the acid liquor can not be remained in the coal body to influence the subsequent exploitation, and can effectively inhibit the coal powder injection hole phenomenon of the gas extraction drilling.
In order to achieve the purpose, the invention adopts the technical scheme that: a soft coal gas extraction drilling and spray inhibiting method with cooperative base plate slotting and acid invasion specifically comprises the following steps:
a. constructing an acid-immersed drill hole from a bottom plate to a coal seam, stopping drilling at a position 0.1m away from the coal seam, respectively constructing 3 gas extraction drill holes parallel to the acid-immersed drill hole on two sides of the acid-immersed drill hole, wherein the interval between every two adjacent gas extraction drill holes is 4m, and rocks between the drill holes and the coal seam are vibrated and crushed in the drilling construction process, so that a rock crushing zone is formed;
b. respectively extending the water power slotting equipment into the deepest part of the acid-immersed drill hole and the gas extraction drill hole, and slotting with the thickness of 0.1m vertically to the acid-immersed drill hole and the gas extraction drill hole, so that the slotting, the acid-immersed drill hole and each gas extraction drill hole are communicated with each other and are parallel to a coal bed;
c. one end of an acid injection pipe and one end of a liquid return pipe extend into the slot through acid-immersed drill holes, one end of the liquid return pipe reaches the top of the slot, the other end of the acid injection pipe is provided with a valve A, the other end of the liquid return pipe is provided with a valve B, one ends of a plurality of gas extraction pipes extend into the slot through the gas extraction drill holes respectively, and the other ends of the gas extraction pipes are provided with valves C respectively;
d. sealing the acid-invaded drill hole and each gas extraction drill hole by using a hole packer, and sequentially connecting an acid liquid pump and an acid liquid tank by the other end of the acid injection pipe through a pipeline;
e. closing each valve C, opening an acid liquid pump, a valve A and a valve B, injecting acid liquid in an acid liquid tank into the slot through an acid injection pipe, closing the valve A and the valve B when the acid liquid flows out from the other end of the liquid return pipe, enabling the acid liquid to be in contact with the rock crushing zone in the slot and erode the rock at the moment, and enabling coal powder in the coal bed to enter the slot through cracks of the rock crushing zone;
f. and opening the valve B every 24 hours, detecting the components of the effluent, opening each valve C when the content of the coal dust in the effluent exceeds 40%, emptying the acid liquid in the slot, connecting the liquid return pipe and each gas extraction pipe with a gas extraction pipe network, and starting gas extraction on the coal seam at the moment.
Further, when the bottom plate is argillaceous sandstone, carbonate, metamorphic rock and shale, the acid solution comprises the following components in parts by mass: 20-25 parts of hydrochloric acid, 0.8-1.2 parts of a thickening agent, 3.5 parts of a cross-linking agent and 0.025 part of a gel breaker.
Further, when the bottom plate is limestone, marble, quartz sandstone and dolomite, the acid liquor comprises the following components in parts by weight: 15-20 parts of hydrochloric acid, 8-10 parts of formic acid, 1-1.5 parts of a corrosion inhibitor, 0.5-1 part of an iron ion stabilizer and 0.2-0.3 part of a cleanup additive.
Compared with the prior art, the method adopts a mode that the bottom plate slotting and the acid cutting are cooperated, firstly, a slot is formed below the coal bed through the bottom plate drilling technology and the hydraulic slotting technology, and a rock breaking zone is formed between the slot and the coal bed; injecting acid liquor into the slots, and adopting an acid liquor erosion method to continuously erode the rocks in the rock fracture zone by the acid liquor, finally forming acid-eroded cracks in the rock fracture zone to form a passage between the coal bed and the slots, wherein the acid liquor enters the passage to carry out acidification treatment on the coal bed, so that gas desorption is effectively promoted; in addition, the formed slot not only increases the contact area of the acid liquid and the rock fracture zone, creates a reaction space for acidizing and erosion, but also provides a pressure relief space for the coal dust to gush out under the action of ground stress and gas pressure; the phenomenon of coal dust orifice in the gas extraction process is prevented; compared with a method for cutting gaps in a coal bed by utilizing hydraulic slotting equipment, the method disclosed by the invention combines a baseplate slotting technology and an acid liquor erosion method in a multi-disciplinary cross infiltration mode, can increase the contact area of acid liquor and rocks under the condition of not damaging the coal bed, and can solve the problems that the hydraulic slotting influence area of the coal bed is small and a sufficient reaction space cannot be created for acidizing erosion; moreover, as the slot is arranged in the rock stratum of the bottom plate, the slot can play a better role in resisting stress deformation and can be continuously used; the phenomenon that the hole is sprayed in the soft coal gas extraction drill hole is effectively inhibited, and the safety of gas extraction is greatly improved; meanwhile, the acid liquor after the reaction can not be remained in the coal body to influence the follow-up exploitation.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention after construction.
In the figure: 1-bottom plate, 2-coal bed, 3-acid invasion drilling, 4-gas extraction drilling, 5-rock breaking zone, 6-slot, 7-acid injection pipe, 8-liquid return pipe, 9-valve A, 10-valve B, 11-gas extraction pipe, 12-valve C, 13-hole packer, 14-acid liquid pump and 15-acid liquid tank.
Detailed Description
The present invention will be further explained below.
As shown in figure 1, the soft coal gas extraction drill hole spray inhibiting method with the cooperation of bottom plate slotting and acid invasion specifically comprises the following steps:
a. constructing an acid-immersed drill hole 3 from a bottom plate 1 to a coal seam 2, stopping drilling at a position 0.1m away from the coal seam, respectively constructing 3 gas extraction drill holes 4 parallel to the acid-immersed drill hole 3 on two sides of the acid-immersed drill hole 3, wherein the interval between every two adjacent gas extraction drill holes 4 is 4m, and rock between the drill holes and the coal seam 2 is vibrated and crushed in the drilling construction process, so that a rock crushing zone 5 is formed;
b. respectively extending the water power slotting equipment into the deepest part of the acid-cutting borehole 3 and the gas extraction borehole 4, and slotting a slot 6 with the thickness of 0.1m perpendicular to the acid-cutting borehole 3 and the gas extraction borehole 4, so that the slot 6, the acid-cutting borehole 3 and each gas extraction borehole 4 are communicated with each other, and the slot 6 is parallel to the coal bed 2;
c. one end of an acid injection pipe 7 and one end of a liquid return pipe 8 extend into the slot 6 through the acid-immersed drill hole 3, one end of the liquid return pipe 8 reaches the top of the slot 6, the other end of the acid injection pipe 7 is provided with a valve A9, the other end of the liquid return pipe 8 is provided with a valve B10, one ends of a plurality of gas extraction pipes 11 respectively extend into the slot 6 through each gas extraction drill hole 4, and the other ends of the gas extraction pipes 11 are respectively provided with a valve C12;
d. sealing the acid-invaded drill hole 3 and each gas extraction drill hole 4 by using a hole packer 13, and sequentially connecting an acid liquid pump 14 and an acid liquid tank 15 to the other end of the acid injection pipe 7 through a pipeline;
e. closing each valve C12, opening the acid liquid pump 14, the valve A9 and the valve B10, injecting acid liquid in the acid liquid tank 15 into the slot 6 through the acid injection pipe 7, and closing the valve A9 and the valve B10 when the acid liquid flows out from the other end of the liquid return pipe 8, so that the acid liquid is in contact with the rock breaking zone 5 in the slot 6 and erodes the rock, and coal dust in the coal seam 2 enters the slot 6 through the cracks of the rock breaking zone 5; when the bottom plate 1 is argillaceous sandstone, carbonate, metamorphic rock and shale, the acid liquor comprises the following components in parts by weight: 20-25 parts of hydrochloric acid, 0.8-1.2 parts of a thickening agent, 3.5 parts of a cross-linking agent and 0.025 part of a gel breaker; when the bottom plate 1 is limestone, marble, quartz sandstone and dolomite, the acid liquor comprises the following components in parts by weight: 15-20 parts of hydrochloric acid, 8-10 parts of formic acid, 1-1.5 parts of a corrosion inhibitor, 0.5-1 part of an iron ion stabilizer and 0.2-0.3 part of a cleanup additive; the thickening agent, the cross-linking agent, the gel breaker, the corrosion inhibitor, the iron ion stabilizer and the cleanup additive are all the existing materials.
f. And opening a valve B10 every 24 hours, detecting the components of the effluent, opening each valve C12 when the content of the coal dust in the effluent exceeds 40%, emptying the acid liquid in the slot 6, connecting the liquid return pipe 8 and each gas extraction pipe 11 with a gas extraction pipe network, and starting gas extraction on the coal seam 2 at the moment.
Claims (3)
1. A soft coal gas extraction drilling hole spray inhibiting method with cooperative base plate slotting and acid invasion is characterized by comprising the following specific steps:
a. constructing an acid-immersed drill hole from a bottom plate to a coal seam, stopping drilling at a position 0.1m away from the coal seam, respectively constructing 3 gas extraction drill holes parallel to the acid-immersed drill hole on two sides of the acid-immersed drill hole, wherein the interval between every two adjacent gas extraction drill holes is 4m, and rocks between the drill holes and the coal seam are vibrated and crushed in the drilling construction process, so that a rock crushing zone is formed;
b. respectively extending the water power slotting equipment into the deepest part of the acid-immersed drill hole and the gas extraction drill hole, and slotting with the thickness of 0.1m vertically to the acid-immersed drill hole and the gas extraction drill hole, so that the slotting, the acid-immersed drill hole and each gas extraction drill hole are communicated with each other and are parallel to a coal bed;
c. one end of an acid injection pipe and one end of a liquid return pipe extend into the slot through acid-immersed drill holes, one end of the liquid return pipe reaches the top of the slot, the other end of the acid injection pipe is provided with a valve A, the other end of the liquid return pipe is provided with a valve B, one ends of a plurality of gas extraction pipes extend into the slot through the gas extraction drill holes respectively, and the other ends of the gas extraction pipes are provided with valves C respectively;
d. sealing the acid-invaded drill hole and each gas extraction drill hole by using a hole packer, and sequentially connecting an acid liquid pump and an acid liquid tank by the other end of the acid injection pipe through a pipeline;
e. closing each valve C, opening an acid liquid pump, a valve A and a valve B, injecting acid liquid in an acid liquid tank into the slot through an acid injection pipe, closing the valve A and the valve B when the acid liquid flows out from the other end of the liquid return pipe, enabling the acid liquid to be in contact with the rock crushing zone in the slot and erode the rock at the moment, and enabling coal powder in the coal bed to enter the slot through cracks of the rock crushing zone;
f. and opening the valve B every 24 hours, detecting the components of the effluent, opening each valve C when the content of the coal dust in the effluent exceeds 40%, emptying the acid liquid in the slot, connecting the liquid return pipe and each gas extraction pipe with a gas extraction pipe network, and starting gas extraction on the coal seam at the moment.
2. The soft coal gas extraction drilling hole spray inhibiting method based on the cooperation of bottom plate slot and acid invasion according to claim 1, characterized in that when the bottom plate is argillaceous sandstone or carbonate or metamorphic rock or shale, the acid solution comprises the following components in parts by mass: 20-25 parts of hydrochloric acid, 0.8-1.2 parts of a thickening agent, 3.5 parts of a cross-linking agent and 0.025 part of a gel breaker.
3. The soft coal gas extraction drilling hole spray inhibiting method based on the cooperation of bottom plate slot and acid invasion according to claim 1, is characterized in that when the bottom plate is limestone or marble or quartz sandstone or dolomite, the acid liquor comprises the following components in parts by mass: 15-20 parts of hydrochloric acid, 8-10 parts of formic acid, 1-1.5 parts of a corrosion inhibitor, 0.5-1 part of an iron ion stabilizer and 0.2-0.3 part of a cleanup additive.
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| CN202110010884.9A CN112727403B (en) | 2021-01-06 | 2021-01-06 | Soft coal gas extraction drilling and injection inhibiting method with cooperation of bottom plate slot and acid invasion |
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| CN202110010884.9A CN112727403B (en) | 2021-01-06 | 2021-01-06 | Soft coal gas extraction drilling and injection inhibiting method with cooperation of bottom plate slot and acid invasion |
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| CN112727403B true CN112727403B (en) | 2022-06-14 |
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|---|---|---|---|---|
| CA2582679A1 (en) * | 2006-06-09 | 2007-12-09 | Halliburton Energy Services, Inc. | Methods and devices for treating multiple-interval well bores |
| CN106640023A (en) * | 2016-10-21 | 2017-05-10 | 山东科技大学 | Gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification |
| CN108166953A (en) * | 2017-12-27 | 2018-06-15 | 武汉理工大学 | Jet stream slot and CO2Acid fracturing explosion connection makees coal rock dynamic disaster control method |
| CN108331610A (en) * | 2018-02-05 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | Method for enhancing permeability of soft coal body containing gas under combined action of shock wave and acidification |
| CN110685733A (en) * | 2019-10-10 | 2020-01-14 | 山东科技大学 | Pressurized hole sealing device for acid disturbance for coal mine and use method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2582679A1 (en) * | 2006-06-09 | 2007-12-09 | Halliburton Energy Services, Inc. | Methods and devices for treating multiple-interval well bores |
| CN106640023A (en) * | 2016-10-21 | 2017-05-10 | 山东科技大学 | Gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification |
| CN108166953A (en) * | 2017-12-27 | 2018-06-15 | 武汉理工大学 | Jet stream slot and CO2Acid fracturing explosion connection makees coal rock dynamic disaster control method |
| CN108331610A (en) * | 2018-02-05 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | Method for enhancing permeability of soft coal body containing gas under combined action of shock wave and acidification |
| CN110685733A (en) * | 2019-10-10 | 2020-01-14 | 山东科技大学 | Pressurized hole sealing device for acid disturbance for coal mine and use method |
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