CN112342007A - Coal and gas mining integrated anti-reflection enhancer, preparation method and application - Google Patents
Coal and gas mining integrated anti-reflection enhancer, preparation method and application Download PDFInfo
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- 238000005065 mining Methods 0.000 title claims abstract description 75
- 239000003623 enhancer Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- FHDQNOXQSTVAIC-UHFFFAOYSA-M 1-butyl-3-methylimidazol-3-ium;chloride Chemical compound [Cl-].CCCCN1C=C[N+](C)=C1 FHDQNOXQSTVAIC-UHFFFAOYSA-M 0.000 claims abstract description 42
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 39
- 230000035699 permeability Effects 0.000 claims abstract description 33
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 22
- 108700004121 sarkosyl Proteins 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- KSAVQLQVUXSOCR-UHFFFAOYSA-M sodium lauroyl sarcosinate Chemical compound [Na+].CCCCCCCCCCCC(=O)N(C)CC([O-])=O KSAVQLQVUXSOCR-UHFFFAOYSA-M 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 51
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- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000002608 ionic liquid Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
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- 238000005260 corrosion Methods 0.000 claims description 4
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- 230000033558 biomineral tissue development Effects 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 2
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- 238000000605 extraction Methods 0.000 claims description 2
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- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 description 15
- 239000000460 chlorine Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 14
- 238000002347 injection Methods 0.000 description 14
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- 230000002265 prevention Effects 0.000 description 14
- 229910052708 sodium Inorganic materials 0.000 description 14
- 239000011734 sodium Substances 0.000 description 14
- IAZSXUOKBPGUMV-UHFFFAOYSA-N 1-butyl-3-methyl-1,2-dihydroimidazol-1-ium;chloride Chemical compound [Cl-].CCCC[NH+]1CN(C)C=C1 IAZSXUOKBPGUMV-UHFFFAOYSA-N 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- BACYUWVYYTXETD-UHFFFAOYSA-N N-Lauroylsarcosine Chemical compound CCCCCCCCCCCC(=O)N(C)CC(O)=O BACYUWVYYTXETD-UHFFFAOYSA-N 0.000 description 11
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- 239000003153 chemical reaction reagent Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- CVSVTCORWBXHQV-UHFFFAOYSA-N creatine Chemical compound NC(=[NH2+])N(C)CC([O-])=O CVSVTCORWBXHQV-UHFFFAOYSA-N 0.000 description 6
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- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
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- BZXMNFQDWOCVMU-UHFFFAOYSA-N 2-[dodecanoyl(methyl)amino]acetic acid;sodium Chemical compound [Na].CCCCCCCCCCCC(=O)N(C)CC(O)=O BZXMNFQDWOCVMU-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
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- 229960003624 creatine Drugs 0.000 description 3
- 239000006046 creatine Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 229940045885 sodium lauroyl sarcosinate Drugs 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
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- 239000012744 reinforcing agent Substances 0.000 description 2
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- WUNVTWGPFJFCPH-UHFFFAOYSA-N [Cl].C(CCC)N1CN(C=C1)C Chemical compound [Cl].C(CCC)N1CN(C=C1)C WUNVTWGPFJFCPH-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
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- 230000006378 damage Effects 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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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
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Oil, Petroleum & Natural Gas (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention belongs to the technical field of efficient and safe production of mines, and discloses a coal and gas mining integrated permeability-increasing enhancer, a preparation method and application thereof, wherein the permeability-increasing enhancer comprises, by mass, 6% -10% of 20mol/l concentrated nitric acid, 1% -5% of sodium N-lauroyl sarcosinate, 2% -6% of 1-butyl-3-methylimidazolium chloride and mine dust-proof water. The coal and gas mining integrated enhancer provided by the invention can improve the wettability of the coal body by physicochemical modification of the coal body, inhibit and reduce the generation of dust in the coal bed mining process, greatly improve the permeability of the coal body, improve the occurrence and mining conditions of the coal bed, facilitate the efficient development and utilization of coal bed gas, improve the exploitation of the coal bed gas, relieve the energy shortage, prevent the gas disaster of underground coal mines, reduce the emission of greenhouse gas, facilitate the efficient co-exploitation of coal and coal bed gas, and further promote the safe and efficient production level of the coal mines in China.
Description
Technical Field
The invention belongs to the technical field of efficient and safe production of mines, and particularly relates to an integrated permeability-increasing enhancer for coal and gas mining, a preparation method and application.
Background
At present, coal is a strategic resource in China, and accounts for 65% and 60.3% of primary energy production and consumption structures in China respectively. 92% of coal production in China is underground mining, the average depth reaches 660m, underground coal seams are complex in occurrence and mining conditions, and the problems of low coal seam permeability, poor wettability, large mining pollution, low efficiency and the like exist. Due to the limitations of the properties, the problems of low coal seam water injection rate, poor coal wettability, high pollution and the like exist in the process of mining and using the coal seam water injection agent. The coal seam water injection technology has important effects on underground rock burst prevention, coal and gas outburst prevention, dust concentration reduction, fire prevention, cooling and the like, and can effectively improve the production environment of a working face. In a coal mine site, the wettability of coal is directly related to the success of a coal seam water injection technology and the mine dust prevention and control effect. Therefore, a proper reagent is explored to modify the coal body, the water injection porosity and the moisture of the coal are improved and the content of the heteroatom of the coal is reduced from the physical and chemical structural properties of the coal body, and theoretical reference and technical guidance are provided for underground rock burst prevention, coal and gas outburst prevention, dust concentration reduction, fire prevention and temperature reduction and subsequent conversion and use of coal resources.
More than 50% of underground coal seams are high gas coal seams, which are easy to cause gas accidents. The coal bed gas (gas) isA clean non-renewable mineral energy source associated with coal bed, but with CO as its ozone layer27 times of that of the traditional Chinese medicine, and the generated greenhouse effect is CO221 times of the total weight of the powder. Therefore, an anti-reflection reinforcing agent integrating coal mining and gas mining and a preparation method thereof are needed.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the underground coal seam occurrence and mining conditions are complex, and the coal seam has low permeability, poor wettability, large mining pollution and low efficiency.
(2) Due to the limitations of the properties, the coal seam water injection rate is low, the coal wettability is poor and the pollution is large during the mining and using processes.
The difficulty in solving the above problems and defects is: china is the first major energy consuming country in the world, and in China's energy composition, coal is in and is always in a dominant position for a long time in the future. China is a world large country for coal resource consumption and production, but more coal mine disasters occur in the production process. Therefore, a novel coal and gas mining integrated permeability-increasing enhancer and a preparation method thereof are needed to be searched, so that the water injection porosity and wettability of coal are improved, and theoretical reference and technical guidance are provided for preventing and treating coal mine disaster accidents.
In recent years, the coal mining depth of China is continuously increased, the mining level of the degree of mechanization and automation is gradually improved, 92% of coal production of China is underground mining, the average depth reaches 660m, however, more than 50% of coal seams of China are high-gas coal seams, the occurrence and mining conditions of the coal seams are complex, the problems of small porosity, low permeability, poor water injection efficiency and the like of the coal seams exist, and the natural disaster degrees of coal and gas outburst, roof accidents, pneumoconiosis and the like in the coal mine production process are continuously upgraded, so that a large amount of manpower and material resources are lost. At present, various coal mines in China adopt measures for partially improving the coal body structure and improving the high-efficiency safe production efficiency, such as anti-reflection technologies of hydraulic fracturing, hydraulic slotting, presplitting blasting, thermal displacement and the like more or less; but from the application effect, the effect is not ideal, such as hydraulic fracturing (with the problems of small anti-reflection range, quick fracture closure, water lock effect and the like), fracture water crack blasting (with the problems of large consumption of manpower and material resources and danger); the coal seam is injected with water (the water injection efficiency is low, the coal mine application benefit is poor, and the like), and a heat injection method (the water or steam heat injection method has low efficiency and large energy consumption and can also intensify the water lock effect) is performed on the coal seam, so that a novel coal and gas mining integrated permeability increasing enhancer and a preparation method are urgently needed to be searched, so that the high-efficiency extraction of coal and gas is realized, and the existing resources are efficiently utilized.
The significance of solving the problems and the defects is as follows: the coal and gas exploitation integrated permeability-increasing enhancer, the preparation method and the application are provided to respond to the national call, the improvement of the coal seam water injection technology is facilitated, the coal seam water injection enhancer plays an important role in underground rock burst prevention and control, coal and gas outburst prevention, dust concentration reduction, fire prevention, cooling and the like, and the production environment of a working face can be effectively improved. The coal and gas mining integrated permeability-increasing enhancer, the preparation method and the application meet the national requirements, provide theoretical reference and technical guidance for underground rock burst prevention, coal and gas outburst prevention, dust concentration reduction, fire prevention and cooling, and subsequent conversion and use of coal resources, enrich the coal and gas co-mining basic theory, and have important guiding significance for realizing coal bed permeability increase and efficient and safe production of coal and gas.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an integrated permeability-increasing strengthening agent for coal and gas exploitation, a preparation method and application.
The invention is realized in such a way that the coal and gas exploitation integrated permeability-increasing enhancer consists of, by mass, 6% -10% of 20mol/l concentrated nitric acid, 1% -5% of sodium N-lauroyl sarcosinate, 2% -6% of 1-butyl-3-methylimidazolium chloride and the balance of mine dust-proof water, wherein the balance is supplemented to 100%.
Further, the physicochemical properties of the mine dustproof water comprise: pH of 7.52, chemical oxygen demand CODcr of 13.61mg/l, suspended matter content of 18.43mg/l, conductivity of 0.689ms/cm, and total hardness of279mg/l CaCO3The degree of mineralization was 526 mg/l.
Furthermore, the surfactant is N-lauroyl creatine sodium, and the ionic liquid is 1-butyl-3-methylimidazole chloride.
Further, the wetting agent is N-lauroyl creatine sodium; concentrated nitric acid reacts with coal mineral substance to generate new corrosion holes; the 1-butyl-3-methylimidazolium chloride salt changes the discretely distributed pores of the coal body into pore-fracture network-like distribution by utilizing the property of dissolving and expanding the coal body.
Further, the coal and gas exploitation integrated enhancer is an acid-surfactant-ionic liquid system.
The invention also aims to provide a preparation method of the coal and gas exploitation integrated permeability-increasing enhancer, which comprises the following steps:
step one, adding 150ml of mine water into an empty beaker A, and measuring a certain volume of 20mol/l concentrated HNO3Adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution;
step two, taking an empty beaker, adding 30ml of mine water into the empty beaker, numbering the empty beaker with the number B, weighing a certain amount of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, and stirring the mixture after setting the temperature of a constant-temperature stirrer to be 25-35 ℃ so as to completely dissolve the N-sodium lauroyl sarcosine and ensure that the solution is uniform;
step three, weighing a certain mass of 1-butyl-3-methylimidazolium chloride [ Bmim ] Cl, pouring the weighed mass of 1-butyl-3-methylimidazolium chloride [ Bmim ] Cl into the solution B, setting the temperature of a constant-temperature stirrer to be 50-60 ℃, and then stirring to completely dissolve the 1-butyl-3-methylimidazolium chloride, wherein the solution is uniform, so as to obtain a second solution;
and step four, pouring the second solution into the first solution, and continuously stirring by using a glass rod to enable the second solution to uniformly react to obtain the coal and gas mining integrated enhancer.
Further, in the first, second and third steps, the HNO is3Volume, mass of N-lauroyl sarcosine sodium and 1-butyl-3-methylimidazolium chloride [ Bmim]The specific value of Cl quality is strong in integration of coal mining and gas miningThe solubility of the reagent is determined. (other volumes such as nitric acid and the mass of N-lauroyl sarcosine sodium correspond to later concentrations, which need to be adjusted depending on the concentration.)
Further, in the third step, the compound temperature value is 50-60 ℃.
Further, the effect of the coal and gas mining integrated enhancer is based on synergistic effects between the agents, including hydrogen bond disruption and re-association and close packing.
The invention also aims to provide a method for realizing coal and gas co-mining, which uses the coal and gas mining integrated permeability-increasing enhancer.
The invention also aims to provide a method for preventing underground coal mines from gas disasters, which uses the coal and gas mining integrated permeability-increasing reinforcing agent.
By combining all the technical schemes, the invention has the advantages and positive effects that: the coal and gas exploitation integrated permeability-increasing enhancer provided by the invention is prepared from 6-10% of concentrated nitric acid (20mol/l), 1-5% of sodium N-lauroyl sarcosinate, 2-6% of 1-butyl-3-methylimidazole chloride and mine dust-proof water. HNO3After processing the coal sample, the number of pores in the coal is greatly increased, and most of the pores are formed by corrosion, and [ Bmim ]]And the Cl acts together, so that the mineral content of the coal can be greatly reduced, most of hematite and pyrite are removed, and the calorific value of the coal body is improved. The surface tension of the coal and gas mining integrated enhancer is 18.87mN/m, which is 33.35% of mine dust-proof water, and the surface tension shows that an anionic surfactant (SLS) and a cationic imidazole ionic liquid ([ Bmim)]Cl) has stronger synergistic effect, can obviously reduce the gas-liquid surface tension of coal and improve the wettability of the surface of the coal. N-sodium lauroyl sarcosinate and 1-butyl-3-methylimidazolium chloride are subjected to ion exchange reaction, concentrated nitric acid is added to enhance the performance of the action of the sodium lauroyl sarcosinate and the mineral substances of the coal body, and finally, a coal and gas mining integrated enhancer is generated, the effect of optimizing the physicochemical property of the coal body is much better than that of the traditional earth acid, and the sodium lauroyl sarcosinate and the 1-butyl-3-methylimidazolium chloride act on the coal bodyAfter the body, a pore-fracture network can be formed. The water molecules are non-uniform in charge around, so that the water molecules have the capability of combining with other molecules to form hydrogen bonds, namely 1 water molecule and 4 water molecules form a hydrogen bond structure, the water molecules are in an obvious molecular cluster aggregation state under the action of the hydrogen bonds, the molecular distance is small, the cohesive energy is large, the interaction between water and coal is not facilitated, and the wetting is not facilitated. The coal and gas exploitation integrated enhancer utilizes the synergistic effect of reagents, including hydrogen bond destruction, re-association and tight filling, reduces the cohesion between solutions, increases the wettability of a coal body, can form hydrogen bond action with the coal body, reacts more violently, forms a pore-fracture network structure, and increases the permeability of the coal body. The coal and gas mining integrated enhancer has the advantages that the coal physical and chemical modification has the function of increasing the wettability of the coal, and is beneficial to inhibiting and reducing the generation of dust in the coal mining process; the permeability of the coal body is greatly improved, the occurrence and mining conditions of the coal bed are improved, and the efficient development and utilization of the coal bed gas are facilitated.
Meanwhile, the invention is beneficial to realizing effective co-mining of coal and gas, not only can relieve and eliminate gas disasters, but also can improve the exploitation of coal bed gas, relieve energy shortage, prevent underground coal mines from generating gas disasters, reduce greenhouse gas emission, greatly improve the wettability and permeability of coal bodies, be beneficial to the efficient co-mining of coal and coal bed gas, and further improve the safe and efficient production level of the coal mines in China.
Drawings
FIG. 1 is a flow chart of a preparation method of an anti-reflection enhancer integrated with coal and gas mining provided by an embodiment of the invention.
FIG. 2 is a schematic diagram of a chemical structure model of a material (coal, nitric acid, N-lauroyl sarcosine sodium, 1-butyl-3-methylimidazolium chloride) provided by an embodiment of the invention.
Fig. 3 is a schematic diagram of a water cluster structure provided in an embodiment of the present invention.
Fig. 4 is a schematic diagram of the effect of the molecular dynamics simulation verification provided by the embodiment of the present invention.
FIG. 5 is a synergistic effect diagram of the coal and gas mining integrated enhancer and the preparation method thereof according to the embodiment of the present invention.
FIG. 6 is an example operational illustration provided by an embodiment of the present invention.
FIG. 7 is a diagram of an example reaction process provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a coal and gas mining integrated permeability-increasing strengthening agent, a preparation method and application thereof, and the invention is described in detail below with reference to the accompanying drawings.
The coal and gas exploitation integrated permeability-increasing enhancer provided by the embodiment of the invention comprises, by mass, 6% -10% of 20mol/l concentrated nitric acid, 1% -5% of sodium N-lauroyl sarcosinate, 2% -6% of 1-butyl-3-methylimidazolium chloride and mine dust-proof water. The physicochemical properties of the mine dust control water are shown in Table 1.
TABLE 1 physicochemical Properties of mine dust-control Water
The basic reagent used for compounding provided by the embodiment of the invention uses concentrated nitric acid, which is different from a conventionally used earth acid system, the surfactant selects N-lauroyl creatine sodium rather than commonly used sodium dodecyl benzene sulfonate, the ionic liquid selects 1-butyl-3-methylimidazole chlorine salt with better performance at present, and for being closer to the actual situation of a coal mining site, the solvent solution selects water for dust prevention of a mine.
The embodiment of the invention provides an integrated coal and gas mining enhancer, wherein the wetting agent is N-lauroyl sarcosine sodium; the concentrated nitric acid reacts with the coal body mineral substance and is used for generating new corrosion holes, so that the number of pores of the coal body is increased; the 1-butyl-3-methylimidazolium chloride salt changes the discretely distributed pores of the coal body into pore-fracture network-shaped distribution by utilizing the performance of the 1-butyl-3-methylimidazolium chloride salt capable of dissolving and expanding the coal body, and increases the permeability of the coal body.
The chemical molecular formula of the basic reagent provided by the embodiment of the invention is as follows:
the chemical structure model schematic diagram of the related material (coal, nitric acid, sodium N-lauroyl sarcosinate, 1-butyl-3-methylimidazolium chloride) provided by the embodiment of the invention is shown in figure 2.
As shown in fig. 1, the preparation method of the coal and gas mining integrated permeability increasing enhancer provided by the embodiment of the invention comprises the following steps:
s101, adding 150ml of mine water into an empty beaker A, and measuring a certain volume of 20mol/l concentrated HNO3Adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution;
s102, taking an empty beaker, adding 30ml of mine water into the empty beaker, numbering the empty beaker with the number B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, and stirring after setting the temperature of a constant-temperature stirrer to be 25-35 ℃ so that the N-sodium lauroyl sarcosine is completely dissolved and the solution is uniform;
s103, weighing a certain mass of 1-butyl-3-methylimidazolium chloride [ Bmim ] Cl, pouring into the B, setting the temperature of a constant temperature stirrer to be 50-60 ℃, and stirring to completely dissolve the 1-butyl-3-methylimidazolium chloride, wherein the solution is uniform, so as to obtain a second solution;
and S104, pouring the second solution into the first solution, and continuously stirring by using a glass rod to enable the second solution to uniformly react to obtain the coal and gas mining integrated enhancer.
The coal and gas exploitation integrated enhancer provided by the embodiment of the invention is an acid-surfactant-ionic liquid system.
The compound temperature value in step S103 provided by the embodiment of the invention is 50-60 ℃.
As shown in fig. 3, the effect of the coal and gas mining integrated enhancer provided by the embodiment of the present invention is based on the synergistic effect between the agents, including hydrogen bond disruption and re-association and close packing.
The schematic diagram of the effect of the molecular dynamics simulation verification provided by the embodiment of the invention is shown in fig. 4.
The synergistic effect diagram of the coal and gas mining integrated enhancer and the preparation method provided by the embodiment of the invention is shown in fig. 5.
The technical solution of the present invention is further described with reference to the following examples.
Example 1
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 6%: the concentration of N-lauroyl sarcosine sodium is 2%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 1 percent, namely obtaining the coal and gas mining integrated enhancer # 1. Adding 20g of coal sample into the prepared integrated enhancer # 1, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. Testing the relevant properties, such as porosity, mean pore size, permeability, etc., can reflect the coalParameters of the pore structure characteristics.
Example 2
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 6%: the concentration of N-lauroyl sarcosine sodium is 4%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 3 percent, namely obtaining the coal and gas mining integrated enhancer # 2. Adding 20g of coal sample into the prepared integrated enhancer #2, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 3
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazoleAzole chloride salt ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 6%: the concentration of N-lauroylsarcosine sodium is 6%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 5 percent, namely obtaining the coal and gas mining integrated enhancer # 3. Adding 20g of coal sample into the prepared integrated enhancer # 3, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 4
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 8%: the concentration of N-lauroyl sarcosine sodium is 2%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 3 percent, namely obtaining the coal and gas mining integrated enhancer # 4. Adding 20g of coal sample into the prepared integrated enhancer #4, carrying out water bath heating reaction treatment at 30 ℃ for 12h, and mixingAnd (4) performing vacuum filtration on the liquid to obtain a modified coal sample, and repeatedly washing the modified coal sample by using distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 5
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 8%: the concentration of N-lauroyl sarcosine sodium is 4%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 5 percent, namely obtaining the coal and gas mining integrated enhancer # 5. Adding 20g of coal sample into the prepared integrated enhancer #5, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 6
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) is added into a beaker, stirred by a glass rod and evenly oscillated to obtainTo a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 8%: the concentration of N-lauroylsarcosine sodium is 6%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 6 percent, namely obtaining the coal and gas mining integrated enhancer # 6. Adding 20g of coal sample into the prepared integrated enhancer #6, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 7
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, stirring with a glass rod continuously to allow uniform reaction,so that the final HNO3The concentration is 10%: the concentration of N-lauroyl sarcosine sodium is 2%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 5 percent, namely obtaining the coal and gas mining integrated enhancer # 7. Adding 20g of coal sample into the prepared integrated enhancer #7, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
Example 8
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 10%: the concentration of N-lauroyl sarcosine sodium is 4%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 1 percent, thus obtaining the coal and gas mining integrated enhancer # 8. Adding 20g of coal sample into the prepared integrated enhancer # 8, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. Testing correlation propertiesSuch as porosity, mean pore size, permeability, etc., which can reflect the parameters of the pore structure characteristics of the coal sample.
Example 9
Adding 150ml of mine water into the empty beaker A, and measuring a certain volume of concentrated HNO3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 10%: the concentration of N-lauroylsarcosine sodium is 6%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 3 percent, namely obtaining the coal and gas mining integrated enhancer # 9. Adding 20g of coal sample into the prepared integrated enhancer #9, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
The above 9 examples were constructed to form an L9(34) orthogonal table, see tables 2 and 3. The results of the properties associated with the modified coal samples obtained in the 9 examples are shown in table 3. The related performance parameters are indexes for measuring the modification result of the compound reagent and mainly comprise the porosity of the coal sample
Average pore size Dave and permeability K, and the number of each index measured by mercury intrusion method. Orthogonal test methodThe method is based on the comprehensive comparability of an orthogonal table, and utilizes a range analysis method (R method for short) to intuitively and simply analyze test results and determine the major and minor and optimal combinations of factors.
TABLE 2 orthogonal factors and horizon
Table 3 shows the results of testing the coal modification with the compounded reagent obtained by different compounding schemes, and table 4 shows the results of orthogonal experiments. When R reflects the fluctuation of the factor level, the fluctuation range of the test index is increased, and the larger R, the more the factor has an influence on the test index, and the more important R is. Therefore, according to the magnitude of R, the major and minor of the factor on the result index, namely the factor major and minor, can be judged.
TABLE 3 Quadrature scheme
TABLE 4 Quadrature results
As can be seen from the results of the calculation of the range R in Table 4, the arrangement order of the major and minor factors is B>A>C, the main and secondary sequence of the influence of the factors on the coal modification effect is as follows: concentration of SLS B, HNO3Concentration A, [ Bmim ]]Concentration C of Cl. Shows that: the surfactant is a key factor for determining the coal modification effect, and the surfactant and the ionic liquid are key factors for determining whether the coal is modified. Selecting the optimal combination of the compound schemes in the orthogonal result table, namely the combination formed by combining the optimal levels of all factors together, so that the optimal combination of the finally obtained compound chemical reagent is A3 B3 C2Namely mine dust-proof water, 6% SLS, 10% HNO3And 3% [ Bmim ]]Cl。
Example 10
Adding into an empty beaker AAdding 150ml of mine water, and measuring concentrated HNO with a certain volume3(20mol/l) adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution; taking an empty beaker, adding 30ml of mine water, numbering B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and stirring to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution; then weighing a certain mass of 1-butyl-3-methylimidazolium chloride ([ Bmim)]Cl) is poured into the B, the temperature of a constant-temperature stirrer is set to be 50-60 ℃, and then stirring is carried out, so that the 1-butyl-3-methylimidazole chloride salt is completely dissolved, and the solution is uniform, thus obtaining a second solution; pouring the second solution into the first solution, and stirring with a glass rod to allow uniform reaction, so as to obtain the final HNO3The concentration is 10%: the concentration of N-lauroylsarcosine sodium is 6%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 3 percent, namely obtaining the coal and gas mining integrated enhancer # 10. Adding 20g of coal sample into the prepared integrated enhancer #10, carrying out water bath heating reaction treatment at 30 ℃ for 12h, carrying out vacuum filtration on the mixed solution to obtain a modified coal sample, and repeatedly washing with distilled water until the pH of the washed and filtered liquid is neutral. The filtered coal sample was dried in a vacuum oven at 50 ℃ for 18h and then sealed as shown in fig. 6 and 7. And (4) testing relevant performances such as porosity, average pore diameter, permeability and the like which can reflect parameters of the pore structure characteristics of the coal sample.
The relevant properties tested were as follows:
after the modification of the coal and gas mining integrated enhancer #10, the porosity of the coal sample is 11.16%; the average aperture is 12.32 nm; the permeability was 83.7 mD. Compared with raw coal without reinforcer (the porosity of the coal sample is 4.32 percent, the average pore diameter is 6.49nm and the permeability is 10.7mD), the structural parameters of the coal sample are greatly optimized layer by layer after the modification action of the coal and gas mining integrated reinforcer #10, and the product and the coal sample of the invention are applied to a coal mining field, so that the production of dust in the coal mining process can be inhibited and reduced; the permeability of the coal body is greatly improved, the occurrence and mining conditions of the coal bed are improved, and the efficient co-mining of the coal and the coal bed gas is facilitated.
Example 11
To further clarify the optimal combination of compounding agents: HNO3The concentration is 10%: the concentration of N-lauroyl sarcosine sodium is 6%: the concentration of 1-butyl-3-methylimidazolium chloride is as follows: 3 percent, the modification effect of the coal sample is analyzed by experimental research on the pores (smaller than 100nm) of the coal sample before and after modification by using a low-temperature nitrogen adsorption experiment, and the experimental result shows that the pore structures before and after the coal sample are modified by the coal and gas mining integrated permeability-increasing enhancer are obviously changed. The coal and gas mining integrated permeability-increasing enhancer has an obvious effect on the pore structure of a coal sample, can effectively enhance the permeability of the coal body, is beneficial to improving the coal bed water injection technology, is beneficial to the efficient co-mining of coal and coal bed gas, and further improves the safe and efficient production level of coal mines in China.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed in the present invention should be covered within the scope of the present invention.
Claims (10)
1. The coal and gas exploitation integrated permeability-increasing enhancer is characterized by comprising, by mass, 6% -10% of 20mol/l concentrated nitric acid, 1% -5% of sodium N-lauroyl sarcosinate, 2% -6% of 1-butyl-3-methylimidazolium chloride and the balance of mine dust-proof water.
2. The coal and gas mining integrated permeability increasing agent of claim 1, wherein the physicochemical properties of the mine dustproof water comprise: pH of 7.52, chemical oxygen demand CODcr of 13.61mg/l, suspended matter content of 18.43mg/l, conductivity of 0.689ms/cm, and total hardness of 279mg/l CaCO3The degree of mineralization was 526 mg/l.
3. The coal and gas mining integrated permeability increasing agent of claim 1, wherein the surfactant is sodium N-lauroyl sarcosinate, and the ionic liquid is 1-butyl-3-methylimidazolium chloride.
4. The coal and gas mining integrated permeability increasing agent of claim 1, wherein the wetting agent is sodium N-lauroyl sarcosinate; the concentrated nitric acid reacts with coal mineral substances to generate new corrosion holes; the 1-butyl-3-methylimidazolium chloride salt changes the discretely distributed pores of the coal body into pore-fracture network-like distribution by utilizing the property of dissolving and expanding the coal body.
5. The coal and gas mining integrated permeability increasing enhancer of claim 1, wherein the coal and gas mining integrated enhancer is an acid-surfactant-ionic liquid system.
6. The preparation method of the coal and gas exploitation integrated permeability-increasing enhancer for the coal and gas exploitation integrated permeability-increasing enhancer according to any one of claims 1 to 5, wherein the preparation method of the coal and gas exploitation integrated permeability-increasing enhancer comprises the following steps:
step one, adding 150ml of mine water into an empty beaker A, and measuring a certain volume of 20mol/l concentrated HNO3Adding the mixture into a beaker, stirring the mixture by using a glass rod, and uniformly oscillating the mixture to obtain a first solution;
step two, taking an empty beaker, adding 30ml of mine water into the empty beaker, numbering the empty beaker with the number B, weighing a certain mass of N-sodium lauroyl sarcosine, pouring the N-sodium lauroyl sarcosine into the beaker B, setting the temperature of a constant-temperature stirrer to be 25-35 ℃, and then stirring the mixture to completely dissolve the N-sodium lauroyl sarcosine and obtain a uniform solution;
step three, weighing a certain mass of 1-butyl-3-methylimidazolium chloride [ Bmim ] Cl, pouring the weighed mass of 1-butyl-3-methylimidazolium chloride [ Bmim ] Cl into the solution B, setting the temperature of a constant-temperature stirrer to be 50-60 ℃, and then stirring to completely dissolve the 1-butyl-3-methylimidazolium chloride, wherein the solution is uniform, so as to obtain a second solution;
and step four, pouring the second solution into the first solution, and continuously stirring by using a glass rod to enable the second solution to uniformly react to obtain the coal and gas mining integrated enhancer.
7. The method for preparing the coal and gas exploitation integrated permeability-increasing enhancer according to claim 6, wherein in the third step, the compound temperature value is 50-60 ℃.
8. The method of claim 6, wherein the effect of the coal and gas extraction integrated permeability enhancer is based on synergy between agents, including hydrogen bond disruption and re-association and close packing.
9. A method for realizing coal and gas co-mining is characterized in that the coal and gas mining integrated permeability increasing enhancer of any one of claims 1 to 5 is used in the method for realizing coal and gas co-mining.
10. A method for preventing underground coal mines from gas disasters, which is characterized by using the coal and gas mining integrated permeability increasing enhancer of any one of claims 1 to 5.
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| CN102337103A (en) * | 2011-07-11 | 2012-02-01 | 山东科技大学 | Penetrant for coal-bed flooding |
| CN103498650A (en) * | 2013-10-24 | 2014-01-08 | 中国地质大学（北京） | Method for improving yield of coal-bed gas well by achieving coal-bed surface gas reverse wetting |
| CN104481577A (en) * | 2014-11-21 | 2015-04-01 | 中国矿业大学 | Drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method |
| CN106437824A (en) * | 2016-11-28 | 2017-02-22 | 田成林 | Gas-containing-coal multistage permeability increasing method |
| CN108822800A (en) * | 2018-06-05 | 2018-11-16 | 山东科技大学 | A kind of dust wetting binder and preparation method for mine belt-conveying |
| CN110284921A (en) * | 2019-04-24 | 2019-09-27 | 山东科技大学 | A kind of severe inclined thick coal seam mash gas harnessing method based on binary complex liquid |
| CN111237007A (en) * | 2020-02-19 | 2020-06-05 | 中煤科工集团重庆研究院有限公司 | Hydraulic fracturing method for underground deep low-permeability coal reservoir |
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