CN112831319A - Permeation enhancer for coal mine underground coal seam and preparation method and use method thereof - Google Patents
Permeation enhancer for coal mine underground coal seam and preparation method and use method thereof Download PDFInfo
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- CN112831319A CN112831319A CN202011644589.0A CN202011644589A CN112831319A CN 112831319 A CN112831319 A CN 112831319A CN 202011644589 A CN202011644589 A CN 202011644589A CN 112831319 A CN112831319 A CN 112831319A
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- 239000003245 coal Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003961 penetration enhancing agent Substances 0.000 title description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 45
- 230000035699 permeability Effects 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 30
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 15
- 239000003623 enhancer Substances 0.000 claims abstract description 15
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims abstract description 15
- 239000004312 hexamethylene tetramine Substances 0.000 claims abstract description 15
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 15
- 239000001103 potassium chloride Substances 0.000 claims abstract description 15
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 7
- 235000010755 mineral Nutrition 0.000 abstract description 7
- 239000011707 mineral Substances 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 3
- 208000010392 Bone Fractures Diseases 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000002775 capsule Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009715 pressure infiltration Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to the technical field of permeability increase of coal mine underground coal seams, in particular to a permeability increasing agent for the coal mine underground coal seams, which comprises the following components in percentage by weight: 7 to 10 percent of citric acid, 3 to 5 percent of sulfamic acid, 1.4 to 1.6 percent of potassium chloride, 0.3 to 0.5 percent of polyethylene glycol, 0.2 to 0.3 percent of hexamethylenetetramine and the balance of water. The permeability enhancer can dissolve mineral substances in the coal bed, improve the fracture development degree of the coal bed, improve the permeability of the coal bed, reduce the filtration loss of the permeability enhancer injected into the coal bed and the corrosion to equipment, and further realize the clean and efficient extraction of the coal bed gas. The invention also provides a preparation method and a use method of the permeability enhancer for the coal mine underground coal seam.
Description
Technical Field
The invention relates to the technical field of permeability increase of coal mine underground coal seams, in particular to a permeability increasing agent for the coal mine underground coal seams, a preparation method and a use method thereof.
Background
The gas permeability of the coal seam directly determines the quality of a gas extraction effect, the problem of poor permeability of most of coal seams mined by mines in China generally exists, along with the continuous increase of mining depth, the difficulty of gas treatment of the coal seam under the conditions of high ground stress, high gas and low gas permeability is increased, the safety production of the coal mine is seriously restricted, in recent years, the gas permeability of the coal seam is improved to a certain extent by the development of conventional physical permeability-increasing measures, but aiming at coal bodies rich in mineral substances, a single physical permeability-increasing mode cannot achieve an ideal effect, the permeability-increasing efficiency of the coal bodies needs to be further improved by combining chemical permeability-increasing measures, at present, the chemical permeability-increasing of domestic and foreign scholars on the coal bodies mainly adopts mixed acid liquor mainly containing hydrochloric acid, the hydrochloric acid can effectively dissolve the mineral substances in the coal bodies, but has strong corrosivity on equipment, and the filtration loss is high due to low viscosity of the acid liquor in the field filling process, causing great waste, and no effective chemical permeability increasing agent suitable for coal bodies is available at present in China.
Disclosure of Invention
In order to solve the problems, the permeability enhancer for the coal mine underground coal seam can dissolve mineral substances in the coal seam, improve the fracture development degree of the coal seam, improve the permeability of the coal seam, reduce the filtration loss of the permeability enhancer injected into the coal seam and the corrosion to equipment, and further realize the clean and efficient extraction of coal seam gas. The invention also provides a preparation method and a use method of the permeability enhancer for the coal mine underground coal seam.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first technical scheme, the permeability enhancer for the coal mine underground coal seam comprises the following components in percentage by weight: 7 to 10 percent of citric acid, 3 to 5 percent of sulfamic acid, 1.4 to 1.6 percent of potassium chloride, 0.3 to 0.5 percent of polyethylene glycol, 0.2 to 0.3 percent of hexamethylenetetramine and the balance of water.
In the second technical scheme, the preparation method of the permeability increasing agent for the coal mine underground coal seam is used for preparing the permeability increasing agent for the coal mine underground coal seam in the first technical scheme,
mixing solid citric acid and solid sulfamic acid according to a ratio to obtain a material A;
mixing solid potassium chloride, solid polyethylene glycol and solid hexamethylenetetramine according to a ratio to obtain a material B;
when in use, the material A is added with water in proportion and stirred to fully dissolve solid powder, the material B is added into the solution A in proportion and stirred for the second time to fully dissolve the material B, and the prepared mixed solution is the permeability increasing agent for the coal mine underground coal seam.
In the second technical solution, preferably, the solid raw materials of the solid citric acid, the solid sulfamic acid, the solid potassium chloride, the solid polyethylene glycol and the solid hexamethylenetetramine have a purity of more than 97%.
In the second technical scheme, preferably, the solid citric acid, the solid sulfamic acid, the solid potassium chloride, the solid polyethylene glycol and the solid hexamethylenetetramine can pass through a 80-mesh sieve.
In a third technical scheme, the method for using the permeability-increasing agent for the coal mine underground coal seam uses the permeability-increasing agent for the coal mine underground coal seam described in the first technical scheme, and injects the permeability-increasing agent for the coal mine underground coal seam into a coal body by using conventional hydraulic permeability-increasing equipment to realize composite permeability increase of the coal body.
The beneficial effects of the invention are as follows:
the permeability-increasing agent for the coal mine underground coal seam prepared by the invention can effectively dissolve and erode minerals and obstructions in the coal seam, reduce the filtration loss in the process of injecting liquid into the coal seam and the erosion to metal equipment, and can realize the composite permeability increase of the coal seam by combining with the traditional hydraulic measures.
Drawings
FIG. 1 is a schematic diagram of a method for using permeability-increasing agent in an underground coal mine.
The reference numerals include:
1-a fracturing pump; 2-a liquid mixing tank; 3-a stirrer; 4-high pressure water inlet rubber pipe; 5-a pressure relief valve; 6-a flange plate; 7-high pressure push rod; 8-hole sealing capsules; 9-a water injector; drilling holes in a 10-point hydraulic fracturing mode; 11-pressure gauge; 12-penetration enhancer.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
The permeability-increasing agent for the coal mine underground coal seam provided by the embodiment comprises the following components in percentage by weight: 7 to 10 percent of citric acid, 3 to 5 percent of sulfamic acid, 1.4 to 1.6 percent of potassium chloride, 0.3 to 0.5 percent of polyethylene glycol, 0.2 to 0.3 percent of hexamethylenetetramine and the balance of water.
In one embodiment, the permeability enhancer for the coal mine underground coal seam comprises the following components in percentage by weight: 8% of citric acid, 4% of sulfamic acid, 1.5% of potassium chloride, 0.4% of polyethylene glycol, 0.25% of hexamethylenetetramine and the balance of water.
In the permeability enhancer for the coal seam under the coal mine, the mixed acid solution consisting of citric acid and sulfamic acid can effectively dissolve and erode minerals and obstructions in the coal body; the potassium chloride can prevent clay minerals in the coal from swelling in water to block pores and cracks of the coal; the thickening agent polyethylene glycol can effectively reduce the filtration loss of the permeability-increasing agent injected into the coal body of the coal mine underground coal seam, increase the reaction time of the permeability-increasing agent of the coal mine underground coal seam and mineral substances in the coal body, and strengthen the permeability-increasing effect; the corrosion inhibitor hexamethylenetetramine can slow down the corrosion of the permeability-increasing agent of the coal bed in the coal mine to metal equipment.
Example 2
A preparation method of a permeability-increasing agent for an underground coal mine coal seam is characterized by preparing the permeability-increasing agent for the underground coal mine coal seam in example 1, and mixing solid citric acid and solid sulfamic acid according to a ratio to obtain a material A; mixing solid potassium chloride, solid polyethylene glycol and solid hexamethylenetetramine according to a ratio to obtain a material B; when in use, the material A is added with water in proportion and stirred to fully dissolve solid powder, the material B is added into the solution A in proportion and stirred for the second time to fully dissolve the material B, and the prepared mixed solution is the permeability increasing agent for the coal mine underground coal seam.
Preferably, the solid raw materials of the solid citric acid, the solid sulfamic acid, the solid potassium chloride, the solid polyethylene glycol and the solid hexamethylenetetramine have the purity of more than 97 percent, and the solid raw materials can pass through a 80-mesh sieve.
Example 3
A method for using a permeability increasing agent for an underground coal mine coal seam is characterized in that the permeability increasing agent for the underground coal mine coal seam in example 1 is used, and a conventional hydraulic permeability increasing device is used for injecting the permeability increasing agent for the underground coal mine coal seam into a coal body, so that the composite permeability increasing of the coal body is realized.
As shown in fig. 1, taking coal seam permeability improvement construction as an example, the hydraulic permeability improvement equipment comprises a fracturing pump 1, a liquid mixing tank 2, a stirrer 3, a high-pressure water inlet rubber tube 4, a pressure release valve 5, a flange plate 6, a high-pressure push rod 7, hole sealing capsules 8, a water injector 9 and a pressure gauge 11, wherein the stirrer 3 is arranged in the liquid mixing tank 2, the liquid mixing tank 2 supplies liquid for the fracturing pump 1 through a pipeline, the liquid outlet end of the fracturing pump 1 is connected with the water injector 9 through the high-pressure water inlet rubber tube 4, the water injector 9 is arranged between the two hole sealing capsules 8, and the pressure release valve 5 and the pressure gauge 11 are arranged on the high-pressure water inlet rubber. The using method of the permeability enhancer for the coal seam under the coal mine comprises the following steps:
step 1, mixing solid citric acid and solid sulfamic acid together according to a ratio to serve as a material A, mixing solid potassium chloride, solid polyethylene glycol and solid hexamethylenetetramine together according to a ratio to serve as a material B, when the water-based water.
And 2, connecting the hole sealing capsule 8, the water injector 9 and the high-pressure push rod 7, and then sending the obtained product into a set fracturing position in the point type hydraulic fracturing drill hole 10. And (3) binding and fixing a flange 6 on the roadway side anchor net through an iron wire, and connecting a high-pressure water inlet rubber pipe 4 connected with the fracturing pump 1 with the tail end of a high-pressure push rod 7 through the flange 6.
And 3, starting the fracturing pump 1 to start point-type infiltration fracturing, injecting a high-pressure infiltration agent 12 into the point-type hydraulic fracturing drill hole 10 through the high-pressure water inlet rubber pipe 4, simultaneously observing the reading of a pressure gauge 11 to keep the fracturing pressure at about 25MPa, after fracturing is successful, ensuring that the pressure in the hole is basically decompressed when the reading of the pressure gauge 11 is below 1MPa, then opening a decompression valve 5 to fully release the residual pressure in the hole, pulling out a high-pressure push rod 7, and performing next-stage point-type infiltration fracturing.
In the using method of the permeability enhancer for the coal seam under the coal mine, in the step 2 and the step 3, the tight connection of all the parts is ensured without leakage points.
In the using method of the permeability enhancer for the coal seam under the coal mine, in the step 3, no personnel near the water outlet is ensured when the pressure release valve 5 is opened, and the personnel are prevented from being sprayed by excess pressure water flow.
The permeability enhancer for the coal mine underground coal seam is not limited to the embodiment, and can be combined with conventional hydraulic permeability-increasing measures, such as hydraulic fracturing, hydraulic slotting, hydraulic cave making and the like. The permeability-increasing agent 12 with a solid proportion is added into water, the permeability-increasing agent 12 is fully dissolved into the water through a stirrer 3 of a high-pressure pump water tank to prepare the permeability-increasing agent 12, and then the permeability-increasing agent 12 is injected into the coal body through high pressure provided by a high-pressure pump, so that the composite permeability increase of the coal body is realized.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
Claims (5)
1. A permeability-increasing agent for a coal mine underground coal seam is characterized in that: comprises the following components in percentage by weight: 7 to 10 percent of citric acid, 3 to 5 percent of sulfamic acid, 1.4 to 1.6 percent of potassium chloride, 0.3 to 0.5 percent of polyethylene glycol, 0.2 to 0.3 percent of hexamethylenetetramine and the balance of water.
2. The preparation method of the permeability-increasing agent for the coal mine underground coal seam according to claim 1 is characterized by comprising the following steps:
mixing solid citric acid and solid sulfamic acid according to a ratio to obtain a material A;
mixing solid potassium chloride, solid polyethylene glycol and solid hexamethylenetetramine according to a ratio to obtain a material B;
when in use, the material A is added with water in proportion and stirred to fully dissolve solid powder, the material B is added into the solution A in proportion and stirred for the second time to fully dissolve the material B, and the prepared mixed solution is the permeability increasing agent for the coal mine underground coal seam.
3. The preparation method of the permeability enhancer for the coal mine underground coal seam according to claim 2, which is characterized by comprising the following steps: the purity of the solid raw materials of the solid citric acid, the solid sulfamic acid, the solid potassium chloride, the solid polyethylene glycol and the solid hexamethylenetetramine is more than 97 percent.
4. The preparation method of the permeability enhancer for the coal mine underground coal seam according to claim 2, which is characterized by comprising the following steps: the solid raw materials of the solid citric acid, the solid sulfamic acid, the solid potassium chloride, the solid polyethylene glycol and the solid hexamethylenetetramine can pass through a 80-mesh sieve.
5. A method for using the permeability-increasing agent for the coal mine underground coal seam, which comprises the steps of: and injecting a permeability increasing agent into the coal body of the coal mine underground coal seam by using conventional hydraulic permeability increasing equipment to realize the composite permeability increase of the coal body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644589.0A CN112831319A (en) | 2020-12-31 | 2020-12-31 | Permeation enhancer for coal mine underground coal seam and preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644589.0A CN112831319A (en) | 2020-12-31 | 2020-12-31 | Permeation enhancer for coal mine underground coal seam and preparation method and use method thereof |
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| Publication Number | Publication Date |
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| CN112831319A true CN112831319A (en) | 2021-05-25 |
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| CN202011644589.0A Pending CN112831319A (en) | 2020-12-31 | 2020-12-31 | Permeation enhancer for coal mine underground coal seam and preparation method and use method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403314A (en) * | 2008-11-18 | 2009-04-08 | 河南理工大学 | Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique |
| CN108084967A (en) * | 2017-11-29 | 2018-05-29 | 中国矿业大学 | A kind of magnetization base anatonosis wetting agent for improving coal-bed flooding and subtracting dirt effect |
| CN109810687A (en) * | 2019-03-01 | 2019-05-28 | 中国地质大学（武汉） | A kind of environment-friendly type acidification working solution suitable for the volume increase of hypotonic coalbed methane reservoir |
| CN111042782A (en) * | 2019-11-29 | 2020-04-21 | 中石油煤层气有限责任公司 | Method for recovering production of coal bed gas well |
-
2020
- 2020-12-31 CN CN202011644589.0A patent/CN112831319A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403314A (en) * | 2008-11-18 | 2009-04-08 | 河南理工大学 | Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique |
| CN108084967A (en) * | 2017-11-29 | 2018-05-29 | 中国矿业大学 | A kind of magnetization base anatonosis wetting agent for improving coal-bed flooding and subtracting dirt effect |
| CN109810687A (en) * | 2019-03-01 | 2019-05-28 | 中国地质大学（武汉） | A kind of environment-friendly type acidification working solution suitable for the volume increase of hypotonic coalbed methane reservoir |
| CN111042782A (en) * | 2019-11-29 | 2020-04-21 | 中石油煤层气有限责任公司 | Method for recovering production of coal bed gas well |
Non-Patent Citations (2)
| Title |
|---|
| 李红涛: "《厚煤层放顶煤下上行开采机理与应用研究》", 31 May 2017, 中国矿业大学出版社 * |
| 杜渐: "煤岩表面润湿性探析", 《国土资源高等职业教育研究》 * |
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Address after: 113122 No.11 Binhe Road, Shenfu New District, Fushun City, Liaoning Province Applicant after: Shenyang Research Institute Co.,Ltd. Address before: 113122 No.11 Binhe Road, Shenfu New District, Liaoning Province Applicant before: CCTEG SHENYANG Research Institute |
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