CN113107578B - Coal seam drilling hole combined blockage removal method for pneumatic regrinding powder discharge and chemical suspension powder discharge - Google Patents
Coal seam drilling hole combined blockage removal method for pneumatic regrinding powder discharge and chemical suspension powder discharge Download PDFInfo
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- CN113107578B CN113107578B CN202110383771.3A CN202110383771A CN113107578B CN 113107578 B CN113107578 B CN 113107578B CN 202110383771 A CN202110383771 A CN 202110383771A CN 113107578 B CN113107578 B CN 113107578B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a coal seam drilling combined unblocking method for pneumatic regrinding powder discharge and chemical suspension powder discharge, wherein a four-way valve is connected to a coal seam gas extraction pipe through a flange, and a slag discharge air outlet is connected to a roadway slag discharge pipe through a blowout solenoid valve; the gas injection port is connected to an air compressor through a gas injection one-way electromagnetic valve, and the air compressor is connected to a nitrogen cabinet; the water injection port is connected to the liquid booster pump through the water injection one-way electromagnetic valve, and the liquid booster pump is connected to the water tank; the water tank is internally provided with mine flushing fluid consisting of ferrous salt, industrial peroxyacetic acid and industrial vitamin C, and the mass concentration of the mine flushing fluid is 0.01-1 per mill, 0.01-2 per mill and 0.01-3 per mill respectively; the embodiment is including installation, pneumatic regrind row powder, washing fluid suspension row powder, four steps in hydraulic fracturing reconsitution crack, and buggy coal slime is reconstitued under atmospheric pressure is swung, then transfers the blowout to come with the effect of carrying in the suspension of water pressure fluctuation and washing fluid, plays efficient clearance effect and unblock effect to drilling and crack, has extensive practicality.
Description
Technical Field
The invention particularly relates to the field of coal powder accumulation prevention and control in coal reservoir reconstruction construction, and particularly relates to a coal seam drilling combined blockage removal method for pneumatic regrinding powder removal and chemical suspension powder removal.
Background
Coal seam gas extraction drilling, coal seam hydraulic slotting, hydraulic undercutting, hydraulic punching and other hydraulic measures are taken as coal reservoir transformation methods, are technical means for effectively preventing and controlling coal and gas outburst, gas overrun and other disaster accidents, and are key core technologies adopted by coal mine gas disaster prevention and control and coal seam gas development; in the construction process, coal bodies are damaged to generate a large amount of coal dust, the falling of the coal dust can improve the porosity and the permeability of the coal bodies to a certain extent, but simultaneously, the deposition of coal dust and coal slime can block the crack pores in the coal bed, reduce the porosity and the permeability of the coal bodies and seriously influence the coal reservoir transformation effect; along with the drainage of coal bed gas for a long time, coal powder is gradually accumulated between an artificial crack and a drainage sieve tube and a drilled coal wall along with the flowing of the gas, the crack in the coal bed is gradually closed and the drilled hole is gradually contracted due to the plastic deformation of a coal body, and the deposited coal powder and coal slime are further compacted to reduce the gas drainage efficiency, so that the coal powder is a key factor for restricting the gas drainage efficiency.
In order to solve the problems of gas drainage drilling and artificial crack blockage, clear water is mostly adopted to wash coal dust and hydraulic fracturing is mostly adopted to reconstruct a crack channel, but due to the fact that the coal dust has the characteristics of small specific gravity and strong hydrophobicity and the problem that coal dust and coal slime are compacted for a long time, the coal dust cannot be transported out of a hole when the clear water is used for coal dust washing operation; the conventional flushing fluid for the mine is formed by dissolving auxiliary agents such as a surfactant, a dispersing agent, a defoaming agent, a drainage aid, a tackifier and the like in water, has large influence on the sedimentation stability by the pH value of water, the water hardness and an anti-swelling agent (potassium chloride) used for construction, is complex in preparation process, is limited by the underground construction conditions of a coal mine, cannot be widely used in underground drilling construction, can only use clean water as a powder discharge medium for coal powder flushing, and also often uses clean water as the powder discharge medium in various hydraulic measures for improving coal reservoirs, and has the problems of difficult coal powder discharge and the like; because a large amount of coal dust and coal slime are deposited in the artificial cracks, the blockage removal secondary hydraulic fracturing is difficult to dredge and remove the artificial cracks, and even more serious blockage can be caused because more coal dust is brought into the artificial cracks again.
Disclosure of Invention
Therefore, the invention provides a coal seam drilling combined blockage removal method for pneumatic regrinding powder discharge and chemical suspension powder discharge to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the coal seam drilling combined blockage removing method for pneumatic regrinding powder discharge and chemical suspension powder discharge is characterized by comprising the following steps of:
the method comprises the following steps: mounting and preparing, namely connecting the four-way valve to a coal seam gas extraction pipe by adopting a flange; the slag discharge exhaust port is connected to a roadway slag discharge pipe through a blowout electromagnetic valve and is discharged into a roadway drainage ditch; the gas injection port is sequentially communicated with an air compressor and a nitrogen cabinet through a gas injection one-way electromagnetic valve; the water injection port is sequentially communicated with a liquid booster pump and a water tank through a water injection one-way electromagnetic valve; sequentially adding ferrous salt, industrial peracetic acid and industrial vitamin C into a water tank, and after the water tank is dissolved in water, respectively setting the mass concentrations of the ferrous salt, the peracetic acid and the vitamin C to be 0.01-1 per mill, 0.01-2 per mill and 0.01-3 per mill, so as to form a mine flushing fluid;
step two: the powder is discharged through pneumatic regrinding, the open-flow electromagnetic valve is closed, the gas injection one-way electromagnetic valve is closed, the water injection one-way electromagnetic valve is opened, and 1m of powder is injected into the extraction drill hole3Closing the water injection one-way electromagnetic valve after flushing fluid; starting a high-pressure nitrogen pump set, starting a gas injection one-way electromagnetic valve to inject nitrogen into the gas extraction pipe, closing the gas injection one-way electromagnetic valve when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve to perform blowout; the process from nitrogen injection to open flow is repeated automatically for a plurality of times, and when no liquid and coal powder are taken out in the roadway, the high-pressure nitrogen pump set and the open flow electromagnetic valve are closed;
step three: suspending and discharging powder from flushing liquid, starting a hydraulic fracturing pump set, starting a water injection one-way electromagnetic valve to inject the flushing liquid into a gas extraction pipe, closing the water injection one-way electromagnetic valve when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve to perform blowout; the process from water injection to open flow is automatically repeated for a plurality of times, when no liquid and coal powder are brought out in the roadway, the water injection one-way electromagnetic valve is closed, and the open flow electromagnetic valve is closed;
step four: hydraulic fracturing reconstructs a fracture, flushing fluid is used as fracturing fluid, a hydraulic fracturing pump set is started, the water injection pressure is set to be 20MPa, a water injection one-way electromagnetic valve is started to perform secondary hydraulic fracturing on a gas extraction drilled hole, pulverized coal generated in the fracturing process is discharged back through a slag discharge air outlet along with the flushing fluid, and an artificial fracture channel is reconstructed; and after the completion, the four-way valve is detached from the extraction pipe, the extraction pipe is connected into the coal bed gas pumping and discharging system again, and information such as the concentration of the extracted gas and the extraction purity of each drill hole is monitored.
Further, preferably, in the first step, the ferrous salt includes at least one of ferrous chloride, ferrous sulfate and ferrous nitrate.
Compared with the prior art, the invention has the beneficial effects that:
1. the coal bed drilling combined blockage removing method for pneumatic regrinding powder discharge and chemical suspension powder discharge can firstly spray most of coal powder out of the drilling hole, and avoid the problem that the coal powder is brought into artificial cracks again when cracks are reconstructed by secondary hydraulic fracturing.
2. In the method, oily hydrocarbon substances coated on the surface of the coal dust are quickly decomposed by the high-activity organic free base electrode generated in situ, so that the hydrophilicity of the coal dust is greatly improved, and the capability of flushing fluid for carrying the coal dust in a suspension manner is obviously improved; the stability and the powder carrying capacity of the coal mine water-based anti-swelling agent are not influenced by the pH value and the hardness of the mine water and the dosage of the anti-swelling agent (the dosage of potassium chloride is between 0.5 and 3 percent) used for coal reservoir transformation construction, and the preparation process is simple and convenient.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the transport of the washing liquid carrying the pulverized coal in the present invention.
In the figure: 1. a gas extraction pipe; 2. a hole packer; 3. crushing the belt; 4. a crack interference zone; 5. a four-way valve; 5-1, flange; 5-2, open-flow electromagnetic valve; 6. a water injection one-way solenoid valve; 7. a liquid booster pump; 8. a water tank; 9. a gas injection one-way electromagnetic valve; 10. an air compressor; 11. a nitrogen cabinet.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): referring to fig. 1 and 2, in the drawings, reference numeral 2 is a hole packer, and the present invention provides a technical solution: the coal bed drilling combined blockage removing method for pneumatic regrinding powder discharge and chemical suspension powder discharge comprises the following steps:
the method comprises the following steps: mounting and preparing, namely connecting a four-way valve 5 to a coal seam gas extraction pipe 1 by adopting a flange 5-1; the slag discharge exhaust port is connected to a roadway slag discharge pipe through a blowout electromagnetic valve 5-2 and is discharged into a roadway drainage ditch; the gas injection port is sequentially communicated with an air compressor 10 and a nitrogen cabinet 11 through a gas injection one-way electromagnetic valve 9; the water injection port is sequentially communicated with a liquid booster pump 7 and a water tank 8 through a water injection one-way electromagnetic valve 6; ferrous salt, industrial peroxyacetic acid and industrial vitamin C are sequentially added into a water tank 8, and after the ferrous salt, the peroxyacetic acid and the vitamin C are dissolved in water, the mass concentrations of the ferrous salt, the peroxyacetic acid and the vitamin C are respectively set to be 0.01-1 per mill, 0.01-2 per mill and 0.01-3 per mill, so that mine flushing fluid is formed;
step two: the powder is discharged through pneumatic regrinding, the open flow electromagnetic valve 5-2 is closed, the gas injection one-way electromagnetic valve 9 is closed, the water injection one-way electromagnetic valve 6 is opened, and 1m of gas is injected into the extraction drill hole 13Closing the water injection one-way electromagnetic valve 6 after flushing fluid; starting a high-pressure nitrogen pump set, starting a gas injection one-way electromagnetic valve 9 to inject nitrogen into the gas extraction pipe 1, closing the gas injection one-way electromagnetic valve 9 when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve 5-2 to perform blowout; the process of injecting nitrogen into the open flow is automatically repeated for a plurality of times, and when no liquid and coal powder are taken out in the roadway, the high-pressure nitrogen pump set is closed, and the open flow electromagnetic valve 5-2 is closed; specifically, the pressure in the drill hole is increased by pressurizing the gas in the drill hole and then instantaneously released, so that the pressure in the drill hole is agitated, the compacted coal powder and coal slurry around the drill hole are crushed again and are sprayed out along with the high-pressure gas, and after most of the coal powder and coal slurry are taken out of the drill hole, the coal wall of the drill hole is subjected to tensile fracture and shear fracture, so that a crushing zone 3 and a fracture interference zone 4 are formed, and the hydraulic fracturing is facilitated to reconstruct a fracture channel;
step three: suspending and discharging powder from flushing liquid, starting a hydraulic fracturing pump set, starting a water injection one-way electromagnetic valve 6 to inject the flushing liquid into the gas extraction pipe 1, closing the water injection one-way electromagnetic valve 6 when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve 5-2 to perform blowout; the process from water injection to open flow is automatically repeated for a plurality of times, when no liquid and coal powder are brought out in the roadway, the water injection one-way electromagnetic valve 6 is closed, and the open flow electromagnetic valve 5-2 is closed; specifically, referring to fig. 2, peracetic acid in the flushing fluid rapidly generates a large amount of high-activity organic free radicals under the continuous catalytic action of ferrite and vitamin C, the organic free radicals can mineralize and remove oily hydrocarbon substances wrapped on the surface layer of the coal dust within several seconds, so that polar oxygen-containing functional groups such as hydroxyl groups and carboxyl groups in the coal dust are exposed on the surface layer, the hydrophilicity of the coal dust is rapidly improved, the coal dust is converted from an original aggregation floating state and a deposition state into a dynamic suspension state by matching with water pressure fluctuation in a drill hole, and the coal dust is discharged under the suspension and carrying effects of the flushing fluid, so that the drill hole and cracks are efficiently cleaned;
step four: hydraulic fracturing reconstructs a fracture, flushing fluid is used as fracturing fluid, a hydraulic fracturing pump set is started, the water injection pressure is set to be 20MPa, a water injection one-way electromagnetic valve 6 is started to perform secondary hydraulic fracturing on the gas extraction drilled hole 1, pulverized coal generated in the fracturing process is discharged back along with the flushing fluid through a slag discharge air outlet, and an artificial fracture channel is reconstructed; after the end, the four-way valve 5 is detached from the extraction pipe 1, the extraction pipe 1 is connected to the coal bed gas pumping and discharging system again, and information such as the concentration of the extracted gas and the extraction purity of each drill hole is monitored.
In this embodiment, in the first step, the added ferrous salt at least includes one of ferrous chloride, ferrous sulfate and ferrous nitrate.
In order to make the purpose, technical scheme and effect of the invention more clear and definite, the following lists more detailed embodiments to further explain the invention in detail; it should be understood that the specific embodiments described herein are merely illustrative and not restrictive of the technical solutions of the present invention, and that those skilled in the art should understand that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Example 1: preparing mine flushing fluid with ferrous sulfate, peracetic acid and vitamin C mass concentrations of 0.05 per mill, 0.2 per mill and 0.5 per mill respectively
Example 2: preparing mine flushing fluid with ferrous chloride, peracetic acid and vitamin C mass concentrations of 0.1 per mill, 0.5 per mill and 0.8 per mill respectively
Example 3: preparing mine flushing fluid with ferrous sulfate, peracetic acid and vitamin C mass concentrations of 0.3 per mill, 1.0 per mill and 1.5 per mill respectively
Example 4: preparing mine flushing fluid with ferrous chloride, peracetic acid and vitamin C mass concentrations of 0.5 per mill, 1.5 per mill and 2.0 per mill respectively
Example 5: preparing mine flushing fluid with ferrous nitrate, peracetic acid and vitamin C mass concentrations of 1.0 per mill, 2.0 per mill and 2.5 per mill respectively
The flushing fluid of the embodiment 1-5 is subjected to combined blockage removal in 10 gas drainage drill holes with low extraction efficiency in a soft and broken coal seam, and the blockage removal process parameters and drainage effect are recorded as follows:
TABLE 1 unblocking technological parameters and drainage effect for each borehole
As can be seen from the data in table 1, by using the coal seam drilling combined blockage removing method for pneumatic regrinding powder discharge and chemical suspension powder discharge of the present invention, the concentration and the purity of the gas to be drained are improved in examples 1 to 5, wherein the blockage removing effect in examples 3 to 5 is most obvious, and in consideration of the economic cost, the optimal configuration of the flushing fluid should be example 3, and the mass concentrations of the molysite, the peracetic acid and the vitamin C in the aqueous solution are 0.3 per mill, 1.0 per mill and 1.5 per mill respectively; therefore, the pulverized coal and the coal slime are firstly crushed again to form a crushing zone and a crack interference zone through gas pressure agitation in the drill hole, and the crushed pulverized coal is discharged under the action of water pressure fluctuation and suspension and carrying of flushing fluid in the drill hole, so that the drill hole and the crack are cleaned efficiently; the combined blockage removal method has obvious blockage removal effect on the gas drainage drill hole and is obviously superior to the conventional clean water coal powder flushing measure or the hydraulic fracture reconstruction crack measure by matching with the secondary hydraulic fracture reconstruction crack on the basis of the fracture interference zone.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The coal seam drilling combined blockage removing method for pneumatic regrinding powder discharge and chemical suspension powder discharge is characterized by comprising the following steps of:
the method comprises the following steps: mounting and preparing, namely connecting a four-way valve (5) to a coal bed gas extraction pipe (1) by adopting a flange (5-1); the slag discharge exhaust port is connected to a roadway slag discharge pipe through a blowout electromagnetic valve (5-2) and is discharged into a roadway drainage ditch; the gas injection port is sequentially communicated with an air compressor (10) and a nitrogen cabinet (11) through a gas injection one-way electromagnetic valve (9); the water injection port is sequentially communicated with a liquid booster pump (7) and a water tank (8) through a water injection one-way electromagnetic valve (6); ferrous salt, industrial peroxyacetic acid and industrial vitamin C are sequentially added into a water tank (8), and after the ferrous salt, the peroxyacetic acid and the vitamin C are dissolved in water, the mass concentrations of the ferrous salt, the peroxyacetic acid and the vitamin C are respectively set to be 0.01-1 per mill, 0.01-2 per mill and 0.01-3 per mill, so that mine flushing fluid is formed;
step two: performing pneumatic regrinding and powder discharge, closing the open-flow electromagnetic valve (5-2), closing the gas injection one-way electromagnetic valve (9), opening the water injection one-way electromagnetic valve (6), and closing the water injection one-way electromagnetic valve (6) after injecting 1m flushing liquid into the extraction drill hole; starting a high-pressure nitrogen pump set, starting a gas injection one-way electromagnetic valve (9) to inject nitrogen into the gas extraction pipe (1), closing the gas injection one-way electromagnetic valve (9) when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve (5-2) for blowout; the process of injecting nitrogen into the open flow is automatically repeated for a plurality of times, and when no liquid and coal powder are taken out in the roadway, the high-pressure nitrogen pump set is closed, and the open flow electromagnetic valve (5-2) is closed;
step three: suspending and discharging powder from flushing liquid, starting a hydraulic fracturing pump set, starting a water injection one-way electromagnetic valve (6) to inject the flushing liquid into the gas extraction pipe (1), closing the water injection one-way electromagnetic valve (6) when the pressure is suppressed to 4MPa, and opening a blowout electromagnetic valve (5-2) for blowout; the process from water injection to open flow is automatically repeated for a plurality of times, when no liquid and coal powder are brought out in the roadway, the water injection one-way electromagnetic valve (6) is closed, and the open flow electromagnetic valve (5-2) is closed;
step four: hydraulic fracturing reconstructs a fracture, flushing fluid is used as fracturing fluid, a hydraulic fracturing pump set is started, the water injection pressure is set to be 20MPa, a water injection one-way electromagnetic valve (6) is started to perform secondary hydraulic fracturing on the gas extraction drilled hole, pulverized coal generated in the fracturing process is discharged back through a slag discharge air outlet along with the flushing fluid, and an artificial fracture channel is reconstructed; after the end, the four-way valve (5) is detached from the extraction pipe (1), the extraction pipe (1) is connected to the coal bed gas pumping and discharging system again, and the concentration and the extraction purity of the extracted gas of each drill hole are monitored.
2. The coal seam drilling combined blockage removing method for pneumatic regrinding and chemical suspension powder discharge according to claim 1, characterized in that: in the first step, the ferrous salt at least comprises one of ferrous chloride, ferrous sulfate and ferrous nitrate.
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| CN115387771B (en) * | 2022-08-10 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Coal mine underground segmented hydraulic fracturing tool string with rapid blocking removal function and method |
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