CN114508325A - Coal bed gas mining method - Google Patents
Coal bed gas mining method Download PDFInfo
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- CN114508325A CN114508325A CN202011278884.9A CN202011278884A CN114508325A CN 114508325 A CN114508325 A CN 114508325A CN 202011278884 A CN202011278884 A CN 202011278884A CN 114508325 A CN114508325 A CN 114508325A
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- 239000003245 coal Substances 0.000 title claims abstract description 192
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005065 mining Methods 0.000 title claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 149
- 239000012530 fluid Substances 0.000 claims abstract description 127
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 90
- 239000011707 mineral Substances 0.000 claims abstract description 90
- 239000000126 substance Substances 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims description 150
- 235000010755 mineral Nutrition 0.000 claims description 82
- 239000007788 liquid Substances 0.000 claims description 75
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000000243 solution Substances 0.000 claims description 32
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 239000006004 Quartz sand Substances 0.000 claims description 17
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 14
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000001103 potassium chloride Substances 0.000 claims description 12
- 235000011164 potassium chloride Nutrition 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- 230000002596 correlated effect Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 13
- 230000020477 pH reduction Effects 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 239000011435 rock Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000011160 research Methods 0.000 description 8
- 230000035699 permeability Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000002734 clay mineral Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 229910001748 carbonate mineral Inorganic materials 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910052604 silicate mineral Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- BOMULVWIQRJWIX-UHFFFAOYSA-N F.C(C)(=O)O.Cl Chemical compound F.C(C)(=O)O.Cl BOMULVWIQRJWIX-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 241000233805 Phoenix Species 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 229910052960 marcasite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The application discloses a coal bed gas mining method, and belongs to the field of coal bed gas development. The fracturing truck set is used for injecting the high-pressure pad fluid and the sand-carrying fluid into the coal-bed gas well, so that a crack in the coal reservoir is opened, the contact area between the injected first auxiliary industrial acid fluid, mineral substance dissolving acid fluid and mineral substances filled in the crack in the coal reservoir is increased, the time for the acid fluid to perform an acidification reaction with the mineral substances filled in the crack is prolonged by plugging the coal-bed gas well, the acid fluid is further in full contact with the mineral substances filled in the crack, and the effect of dissolving the mineral substances by the acid fluid is improved. Meanwhile, mineral dissolved acid liquor can be prepared according to the content of the mineral filled in the cracks, so that the effect of dissolving the mineral by the acid liquor is further improved, and the yield of the coal bed gas is further improved.
Description
Technical Field
The application relates to the field of coal bed gas development, in particular to a coal bed gas mining method.
Background
As a clean energy, according to statistics, the reserve of coal bed gas geological resources buried more than 2000 m in depth in China is about 36.8 billion cubic meters, and the coal bed gas occupies the third place in the world, and has huge development potential. The coalbed methane reservoir has the characteristic of self generation and self storage, is mainly formed on the surface of a coal matrix in an adsorption state, and is desorbed and produced after drainage and pressure reduction. The seepage capability of coal reservoirs for storing coalbed methane is mainly derived from the cleat-fracture system in the coal reservoir. The cleat-fissure system is two fractures in a coal reservoir, the cleat is mainly an endogenous microcrack channel formed when a large amount of coalbed methane is intensively generated and intermittently released in the coal thermal evolution process, the height and the length of the endogenous microcrack channel are generally 0.01-2 cm, and the width of the endogenous microcrack channel is generally 1-10 microns; the fissures are primarily defined as intergrown macroscopic fissures formed by structural stress changes, typically having a height and length of 10 to 200 centimeters and a width of 0.1 to 0 millimeters. The cleat-fissure system provides a possible channel for the outward diffusion and migration of the coal bed gas after the coal bed gas is desorbed from the surface of the coal matrix.
During formation of a coal reservoir, the coal reservoir, by its own and foreign fluids, produces some primary or secondary minerals that fill fractures in the coal reservoir. The minerals filled in the cracks mainly comprise carbonate minerals such as calcite and silicate minerals such as clay, and also comprise other mineral types such as marcasite and pyrite. The filling of minerals within fractures in coal reservoirs can result in a reduction in the permeability of the coal bed gas within the fractures.
In the related art, the seepage capability of the coal bed gas in the fracture can be improved by adopting an acidification technology. For example, acid liquor can be injected into the coal reservoir and the acid liquor and mineral substances filled in the cracks are subjected to an acidification reaction to dissolve the mineral substances filled in the cracks, so that the permeability of the coal reservoir is improved, and the yield of the coal bed gas can be improved.
However, in the current process of injecting acid liquor into a coal reservoir, the fracture in the coal reservoir is in a closed state, so that the contact area between the injected acid liquor and mineral matters filled in the fracture in the coal reservoir is small, the effect of dissolving the mineral matters by the acid liquor is poor, and the purpose of increasing the yield of coal bed gas cannot be achieved.
Disclosure of Invention
The embodiment of the application provides a coal bed gas mining method. The method can solve the problems that in the prior art, acid liquor is injected into a coal reservoir, the mineral matter dissolving effect of the acid liquor is poor, and the purpose of increasing the yield of the coal bed gas cannot be achieved, and the technical scheme is as follows:
in one aspect, a method for mining coal bed gas is provided, the method comprising:
injecting a pad fluid into the coal-bed gas well by adopting a fracturing truck group;
injecting a sand-carrying liquid into the coal-bed gas well into which the pad fluid is injected by adopting the fracturing truck group;
injecting a first auxiliary industrial acid solution into the coal-bed gas well injected with the sand-carrying liquid by adopting the fracturing truck group;
injecting a mineral dissolved acid solution into the coal-bed gas well injected with the first auxiliary industrial acid solution by using the fracturing truck group;
injecting a second auxiliary industrial acid solution into the coal-bed gas well injected with the mineral dissolved acid solution by using the fracturing truck group;
injecting a displacement fluid into the coal bed gas well into which the second auxiliary industrial acid liquid is injected by adopting the fracturing truck group;
plugging the coal bed gas well injected with the displacement fluid;
after the target duration, discharging liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe;
and mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
Optionally, the mineral-dissolving acid solution comprises: hydrogen chloride in an amount of 15% and hydrogen fluoride in an amount of 3%.
Optionally, the first auxiliary industrial acid liquid and the second auxiliary industrial acid liquid both include: hydrogen chloride in an amount of 15%.
Optionally, the mineral-dissolved acid solution, the first auxiliary industrial acid solution, and the second auxiliary industrial acid solution further include: corrosion inhibitor with a content of 1%.
Optionally, the pad fluid and the displacement fluid both include: potassium chloride in an amount of 1% to 2%.
Optionally, the sand-carrying fluid comprises: potassium chloride in the content of 1 to 2 percent and natural quartz sand.
Optionally, the volume of the natural quartz sand in the sand-carrying fluid injected into the coal-bed gas well is positively correlated with the thickness of the coal reservoir into which the coal-bed gas well extends.
Optionally, the total volume of the pad fluid, the sand-carrying fluid, the first auxiliary industrial acid fluid, the mineral dissolved acid fluid, the second auxiliary industrial acid fluid and the displacing fluid injected into the coal-bed gas well is positively correlated with the thickness of the coal reservoir into which the coal-bed gas well extends.
Optionally, the target duration is greater than or equal to 48 hours.
Optionally, in the process of injecting a pad fluid, a sand-carrying fluid, a first auxiliary industrial acid fluid, a mineral dissolved acid fluid, a second auxiliary industrial acid fluid and a displacement fluid into the coal bed gas well by using the fracturing truck group, the injection amount of the fluid per minute of the fracturing truck group is 2 to 6 cubic meters;
and in the process of discharging the liquid in the coal bed gas well by using the oil nozzle or the oil pipe, the discharge amount of the liquid per hour is 1 cubic meter.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the fracturing truck set is used for injecting the high-pressure pad fluid and the sand-carrying fluid into the coal-bed gas well, so that a crack in the coal reservoir is opened, the contact area between the injected first auxiliary industrial acid fluid, mineral substance dissolving acid fluid and mineral substances filled in the crack in the coal reservoir is increased, the time for the acid fluid to perform an acidification reaction with the mineral substances filled in the crack is prolonged by plugging the coal-bed gas well, the acid fluid is further in full contact with the mineral substances filled in the crack, and the effect of dissolving the mineral substances by the acid fluid is improved. Meanwhile, mineral dissolved acid liquor can be prepared according to the content of the mineral filled in the cracks, so that the effect of dissolving the mineral by the acid liquor is further improved, and the yield of the coal bed gas is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for mining coal bed methane provided by an embodiment of the present application;
FIG. 2 is a flow chart of another method for mining coal bed methane provided in an embodiment of the present application;
FIG. 3 is a flow chart of a coalbed methane mining method provided in example 1 of the present application;
fig. 4 is a flowchart of a coal bed methane mining method provided in embodiment 2 of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the related art, the research on the use of acidizing technology to improve the seepage capability of coal bed gas in fractures has mainly focused on two aspects. On one hand, the acid-rock compatibility experiment is not carried out, and the field experiment research is carried out by adopting a general acid injection mode. For example, in the "preliminary test for acidizing and de-plugging of coal-bed gas wells", an acidizing and de-plugging test for 5 low-yield wells in the hangwa zone is described, and in the "research on acidizing foam fracturing technology of coal-bed gas in the luzhonghua zone", a fracturing test for 27 low-yield wells in the luzhonghua zone is described, in which a fracturing fluid is prepared by mixing pre-acid with active water and injecting nitrogen. The related art proposes a method of injecting a fracturing fluid accompanied by industrial hydrochloric acid of 3% concentration into a coal reservoir at high pressure during fracturing. However, the acidification method does not carry out an acid-rock compatibility experiment, so that the method has poor pertinence to dissolving minerals filled in cracks in the acidification process, and has little reference significance to actual production.
And on the other hand, after an acid-rock compatibility experiment is carried out, an optimized combined acid system is configured according to the result of the acid-rock compatibility experiment, and the physical property change of the fresh coal sample is evaluated after the fresh coal sample is acidified. For example, in the text of "coal bed gas reservoir acidizing technology research" in the master thesis of the university of the Yangtze river, the phoenix mountain, the Chang raised paths between fields mine and the like, after performing an indoor acid-rock compatibility experiment on coal rocks in a coal reservoir, a conclusion is provided that "the suitable acid liquid system of the mineral dissolved acid liquid is 15% of hydrogen chloride +2.0 to 3.0% of hydrogen fluoride +1.5 to 2.0% of a ferric ion stabilizer +0.5 to 1.0% of a clay stabilizer + 0.4% of a cleanup additive, and the pre-acid liquid is 15% of hydrogen chloride"; in the article of indoor initial exploration for improving the permeability of a coal reservoir by utilizing an acidification technology, the influence of hydrochloric acid with the solubility of 6%, 9% and 15% on the permeability of a coal core in the coal reservoir is analyzed; after indoor acid-rock experiments are carried out on coal rocks in coal reservoirs in Yangzhi Gaoriver and Jincheng Daning mine in the article of 'acidification and modification experiments on low-permeability coal reservoirs' of Master thesis of Henan university, the optimal acid system for the Yangzhi Gaoriver is provided to be 3% of hydrogen chloride, 3% of hydrogen fluoride, 3% of acetic acid and 2% of potassium chloride, or 5% of hydrogen chloride, 2% of hydrogen fluoride, 2% of acetic acid and 2% of potassium chloride; the optimal acid system for Jincheng Dannine is 3% hydrogen chloride, 3% hydrogen fluoride, 3% acetic acid and 2% potassium chloride, or 5% hydrogen fluoride, 2% hydrogen chloride, 2% acetic acid and 2% potassium chloride; in the research on chemical permeability increasing experiments of multi-component acid on different coal-rank coal reservoirs, the influence of the multi-component acid (hydrochloric acid-hydrofluoric acid-acetic acid) on the permeability of the different coal-rank coal reservoirs is analyzed; there has also been partial research on the analysis and experimental study of the acidification mechanism of coal reservoirs by potential acids in coal reservoirs. In a large number of experimental processes, it is found that as the acidification reaction proceeds, minerals filled in the cracks are acidified and dissolved, new minerals are formed, and if the minerals are not treated in time, seepage channels are blocked again. At present, because most coal rock samples in a used coal reservoir are centimeter-sized in a laboratory, the samples are usually in an environment without or with low ambient pressure in the experimental process, and the optimal acid liquid system obtained finally in the experiment has a complex formula, the method is mainly focused on laboratory research at present and is less applied to field tests.
Referring to fig. 1, fig. 1 is a flowchart of a coal bed methane mining method according to an embodiment of the present disclosure. The method can comprise the following steps:
And 102, injecting a sand-carrying liquid into the coal-bed gas well injected with the pad fluid by adopting a fracturing truck group.
103, injecting a first auxiliary industrial acid solution into the coal-bed gas well injected with the sand-carrying liquid by adopting a fracturing truck group.
And 104, injecting mineral dissolved acid liquor into the coal-bed gas well injected with the first auxiliary industrial acid liquor by using a fracturing truck group.
And 105, injecting a second auxiliary industrial acid solution into the coal-bed gas well injected with the mineral dissolved acid solution by using a fracturing truck group.
And 106, injecting a displacement fluid into the coal bed gas well injected with the second auxiliary industrial acid liquid by using a fracturing truck group.
And step 107, plugging the coal-bed gas well injected with the displacement fluid.
And 108, after the target duration, discharging the liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe.
And 109, mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
In summary, according to the coal bed gas exploitation method provided by the application, the fracturing truck group is used for injecting the high-pressure pad fluid and the sand-carrying fluid into the coal bed gas well, so that the crack in the coal reservoir is opened, the contact area between the injected first auxiliary industrial acid fluid, mineral substance dissolving acid fluid and the mineral substance filled in the crack in the coal reservoir is increased, the time for the acid fluid and the mineral substance filled in the crack to generate an acidification reaction is prolonged by plugging the coal bed gas well, the acid fluid is further in full contact with the mineral substance filled in the crack, and the effect of dissolving the mineral substance by the acid fluid is improved. Meanwhile, mineral dissolved acid liquor can be prepared according to the content of the mineral filled in the cracks, so that the effect of dissolving the mineral by the acid liquor is further improved, and the yield of the coal bed gas is further improved.
Referring to fig. 2, fig. 2 is a flow chart of another coal bed methane mining method according to an embodiment of the present application. The method can comprise the following steps:
For example, the high voltage performance test in step 201 may include the following steps:
firstly, closing a wellhead valve of the coal bed gas well and a circulating emptying valve in a high-pressure pipeline.
And then, slowly and stably starting a high-pressure pump in the fracturing truck group, and carrying out high-pressure bearing performance test on equipment above a well head valve and a ground fracturing flow pipeline.
Thereafter, the pressure of the high-pressure pump is maintained at 1.2 to 1.5 times the pressure of the high-pressure pump predicted in the actual production process for 15 to 30 minutes.
And finally, observing whether liquid leakage occurs at each joint in the high-pressure and low-pressure pipelines or not and whether the pressure value displayed by a pressure gauge connected to the high-pressure and low-pressure pipelines is reduced or not in the inspection process.
If the liquid leakage phenomenon does not occur at each connection part in the high-pressure and low-pressure pipelines and the pressure numerical value displayed by the pressure gauge connected to the high-pressure and low-pressure pipelines is not reduced, the next step can be carried out; if the liquid leakage phenomenon occurs at any connection position in the high-low pressure pipeline or the pressure value displayed by any pressure gauge connected to the high-low pressure pipeline drops, the pipelines at the positions where the liquid leakage phenomenon occurs and the pressure value displayed by the pressure gauge drops need to be reconnected.
Wherein, this head fluid can include: potassium chloride in an amount of 1% to 2%. The potassium chloride can inhibit the clay mineral substance in the crack from swelling after reacting with water in the pad fluid, so that the crack is prevented from being blocked after the clay mineral substance in the crack swells.
The pad may be used to: the coal reservoir is fractured, and a crack with a certain geometric size can be formed in the coal reservoir, so that the sand-carrying fluid injected in the subsequent step can smoothly enter the crack.
And 203, injecting a sand-carrying liquid into the coal-bed gas well injected with the pad fluid by adopting a fracturing truck group.
Wherein, this sand-carrying fluid can include: potassium chloride and natural quartz sand in the content of 1 to 2 percent.
The sand-carrying fluid can be used for: the natural quartz sand is carried into the fracture created in the coal reservoir by the pad fluid and is packed in the fracture created in the coal reservoir by the pad fluid. In this manner, fractures in the coal reservoir will close on the surface of the natural quartz sand, thereby forming sand-filled fractures with certain geometry and high conductivity within the coal reservoir. And the sand-carrying fluid can also continue to extend the fracture caused by the pad fluid in the coal reservoir, so as to cause a new fracture in the coal reservoir.
In step 203, the volume of the natural quartz sand in the sand-carrying fluid injected into the coal-bed gas well is positively correlated with the thickness of the coal reservoir into which the coal-bed gas well extends.
For example, the volume of natural quartz sand in a sand-carrying fluid injected into a coal bed gas well may be calculated using the following formula:
y1＝k1x (1)
wherein, y1The volume of the natural quartz sand in the sand-carrying fluid injected into the coal bed gas well is expressed in unitCubic meter; x represents the thickness of the coal reservoir into which the coal bed gas well extends, and is measured in meters, k1The volume of the injected natural quartz sand per meter of thickness of the coal reservoir is expressed in cubic meters per meter.
Alternatively, the volume of natural quartz sand injected per meter thickness of coal reservoir may be 8 to 10 cubic meters.
And 204, injecting a first auxiliary industrial acid solution into the coal-bed gas well injected with the sand-carrying liquid by adopting a fracturing truck group.
Wherein, this first supplementary industrial acid liquid can include: hydrogen chloride in an amount of 15%.
The first auxiliary industrial acid can be used for: the method has the advantages that the coal reservoir is pretreated, an acidification reaction environment is provided, meanwhile, the mineral substance dissolving acid liquor injected in the subsequent steps can be prevented from being diluted by the pad fluid and the sand carrying fluid, and the dissolving effect of the mineral substance dissolving acid liquor on mineral substances in the fractures is guaranteed.
And 205, injecting a mineral dissolved acid solution into the coal-bed gas well into which the first auxiliary industrial acid solution is injected by adopting a fracturing truck group.
Wherein the mineral dissolving acid solution may comprise: hydrogen chloride in an amount of 15% and hydrogen fluoride in an amount of 3%.
The mineral-dissolving acid solution can be used for: dissolving the mineral matter filled in the fracture.
It should be noted that the mineral-dissolved acid solution containing 15% of hydrogen chloride and 3% of hydrogen fluoride has a strong acid-dissolving capacity for carbonate and silicate minerals filled in the fracture, and if the minerals filled in the fracture are of other types, other acid solution configurations may be selected, which is not limited in the embodiments of the present application.
And 206, injecting a second auxiliary industrial acid solution into the coal-bed gas well injected with the mineral dissolved acid solution by using the fracturing truck group.
Wherein, this second supplementary industrial acid liquid can include: hydrogen chloride in an amount of 15%.
The second auxiliary industrial acid may be used to: the acidic environment of the fractures in the coal reservoir is maintained, mineral-dissolving acid liquor is prevented from being diluted by displacement liquid injected in the subsequent step, and the second auxiliary industrial acid liquor can also be used for cleaning residual minerals in the fractures, so that the occurrence of residues is reduced.
It should be noted that the mineral-dissolved acid solution, the first auxiliary industrial acid solution, and the second auxiliary industrial acid solution in the steps 204 to 206 may further include: corrosion inhibitor with a content of 1%. The corrosion inhibitor can be used for improving the stability of the mineral dissolved acid liquid, the first auxiliary industrial acid liquid and the second auxiliary industrial acid liquid and ensuring the effect of dissolving minerals of the mineral dissolved acid liquid, the first auxiliary industrial acid liquid and the second auxiliary industrial acid liquid.
And step 207, injecting a displacement fluid into the coal bed gas well injected with the second auxiliary industrial acid liquid by using a fracturing truck group.
Wherein the displacement fluid may comprise: potassium chloride in an amount of 1% to 2%.
The displacement fluid may be used to: and pushing the second auxiliary industrial acid liquor remained in the coal-bed gas well into the coal reservoir to prevent the second auxiliary industrial acid liquor from flowing back into the coal-bed gas well.
It should be noted that, in the above steps 202 to 207, in the process of injecting the pad fluid, the sand-carrying fluid, the first auxiliary industrial acid fluid, the mineral dissolving acid fluid, the second auxiliary industrial acid fluid and the displacing fluid into the coal bed gas well by using the fracturing truck set, the liquid injection amount per minute of the fracturing truck set is 2 to 6 cubic meters. Therefore, the situation that the pressure in the coal reservoir is rapidly increased due to the fact that the speed of liquid injected into the coal-bed gas well by the fracturing truck group is too high can be avoided, the coal reservoir breaks, and the quality of cracks caused in the coal reservoir is guaranteed.
It should be noted that, in the above steps 202 to 207, the total volume of the pad fluid, the sand-carrying fluid, the first auxiliary industrial acid fluid, the mineral-dissolving acid fluid, the second auxiliary industrial acid fluid and the displacement fluid injected into the coal-bed gas well is positively correlated to the thickness of the coal reservoir into which the coal-bed gas well extends.
For example, the total volume of fluid injected into a coal bed methane well may be calculated using the following equation:
y2＝k2x (2)
wherein, y2The total volume of liquid injected into the coal bed gas well is expressed in units of cubic meters; x represents the thickness of the coal reservoir into which the coal bed gas well extends, and is measured in meters, k2The total volume of injected liquid per meter of thickness of the coal reservoir is expressed in cubic meters per meter.
Alternatively, the total volume of injected liquid per meter thickness of coal reservoir may be from 100 to 200 cubic meters.
And step 208, plugging the coal bed gas well injected with the displacement fluid.
As an example, the step 208 may include the following steps:
and closing the fracturing truck group, and plugging the coal-bed gas well injected with the displacement fluid, so that the injected mineral dissolved acid liquid has enough reaction time with the minerals filled in the fracture.
And 209, after the target duration, discharging the liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe.
Wherein the target time period is greater than or equal to 48 hours. Therefore, the mineral dissolving acid injected into the coal reservoir by the fracturing truck group can flow into each crack in the coal reservoir, the contact area between the mineral dissolving acid and the mineral in the crack is increased, sufficient contact time between the mineral dissolving acid and the mineral in the crack is ensured, and the effect of dissolving the mineral in the crack by the mineral dissolving acid is improved.
It should be noted that, in step 209, when the fluid injected into the coal bed gas well is discharged by using the nozzle or the oil pipe, the selection criteria of the nozzle or the oil pipe are as follows:
when the pressure of a well head is 15 to 20 MPa, an oil nozzle with the diameter of 3 millimeters is adopted to discharge liquid injected into the coal bed gas well; when the pressure of a well head is 10 to 15 MPa, a nozzle tip with the diameter of 5 millimeters is adopted to discharge liquid injected into the coal bed gas well; when the pressure of a well head is 5 to 10 MPa, a nozzle tip with the diameter of 8 millimeters is adopted to discharge liquid injected into the coal bed gas well; and when the pressure of the well head is less than 5 MPa, discharging the liquid injected into the coal bed gas well by using an oil pipe.
It should be noted that, in order to prevent the natural quartz sand from being carried out from the cracks during the drainage of the fluid injected into the coal bed gas well, the drainage amount of the fluid per hour is 1 cubic meter during the drainage of the fluid in the coal bed gas well by using the nozzle or the tubing.
And 2010, mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
For example, the step 2010 may include the following steps:
firstly, pumping water in a shaft to the ground by using an oil pumping unit, and gradually reducing the fluid pressure at the bottom of the coal-bed gas well.
Then, as the fluid pressure at the bottom of the coal bed gas well is reduced, a pressure drop funnel is gradually formed in the coal bed gas well and gradually expands outwards, so that the pressure in the coal reservoir is gradually reduced, the coal bed gas adsorbed on the inner surfaces of the pores of the coal matrix in the coal reservoir is forced to be desorbed, and then seeps and diffuses into the cracks in the coal reservoir through the pores of the coal matrix in the coal reservoir.
And finally, the coal bed gas seeps into a shaft of the coal bed gas well from the crack so as to be produced by the oil pumping unit.
In summary, according to the coal bed gas exploitation method provided by the application, the fracturing truck group is used for injecting the high-pressure pad fluid and the sand-carrying fluid into the coal bed gas well, so that the crack in the coal reservoir is opened, the contact area between the injected first auxiliary industrial acid fluid, mineral substance dissolving acid fluid and the mineral substance filled in the crack in the coal reservoir is increased, the time for the acid fluid and the mineral substance filled in the crack to generate an acidification reaction is prolonged by plugging the coal bed gas well, the acid fluid is further in full contact with the mineral substance filled in the crack, and the effect of dissolving the mineral substance by the acid fluid is improved. Meanwhile, mineral dissolved acid liquor can be prepared according to the content of the mineral filled in the cracks, so that the effect of dissolving the mineral by the acid liquor is further improved, and the yield of the coal bed gas is further improved.
The coalbed methane mining method provided by the embodiment of the application is further explained by the specific embodiment.
Example 1
The selected coal-bed gas well is a coal-bed gas well of a Qinan district ancient city well area of Shanxi south, the coal-bed gas well is mined by a two-fold system Shanxi group 3# coal bed, the depth of the coal bed is 698-704.7 m, and the thickness of the coal bed is 6.7 m. After the coal bed gas is produced by implementing the conventional fracturing process, the single well stable yield is only 200 cubic meters per day. After research and analysis, the reason that the yield of the coal-bed gas well is low is considered to be mainly that the seepage capability of the coal reservoir is poor and the inside of the coal rock in the coal reservoir cannot be effectively desorbed to generate gas after the conventional fracturing mining method is adopted because the number of the mineral substances filled in the cracks in the coal reservoir where the coal-bed gas well is located is large. Tests show that the mineral filled in the coal reservoir is mainly clay mineral with an illite/montmorillonite layer, the content of the clay mineral is 6.2%, and the content of the carbonate rock is 1%.
Referring to fig. 3, fig. 3 is a flowchart of a coal bed methane mining method provided in embodiment 1 of the present application, where the coal bed methane mining method includes:
and 301, connecting the fracturing truck group and the high-pressure and low-pressure pipelines, and carrying out high-pressure performance inspection on the high-pressure and low-pressure pipelines.
And 303, injecting 50 cubic meters of pad fluid into the coal-bed gas well by adopting a fracturing truck group, wherein the injection amount of the pad fluid is gradually increased from 0.5 cubic meter per minute to 5 cubic meters per minute.
And 304, injecting 335 cubic meters of sand-carrying liquid into the coal-bed gas well injected with the pad fluid by using a fracturing truck group, wherein the volume of the natural quartz sand in the sand-carrying liquid is 30 cubic meters, and the liquid injection amount of the sand-carrying liquid is kept between 5 cubic meters and 6 cubic meters per minute.
And 305, injecting 10 cubic meters of first auxiliary industrial acid liquid into the coal bed gas well into which the sand-carrying liquid is injected by adopting a fracturing truck group, wherein the injection amount of the first auxiliary industrial acid liquid is 3-4 cubic meters per minute.
And step 306, injecting 60 cubic meters of mineral dissolved acid liquor into the coal bed gas well injected with the first auxiliary industrial acid liquor by using the fracturing truck group, wherein the injection amount of the mineral dissolved acid liquor is 3-4 cubic meters per minute.
And 307, injecting 10 cubic meters of second auxiliary industrial acid liquid into the coal-bed gas well injected with the mineral dissolved acid liquid by using the fracturing truck group, wherein the injection amount of the second auxiliary industrial acid liquid is 3-4 cubic meters per minute.
And 308, injecting 8 cubic meters of displacement fluid into the coal bed gas well into which the second auxiliary industrial acid liquid is injected by adopting a fracturing truck group.
And 309, plugging the coal-bed gas well injected with the displacement fluid for 48 hours.
And 3010, after 48 hours, discharging the liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe.
And 3011, mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
After the coal bed gas well is reformed by using the coal bed gas exploitation method provided by the embodiment, the stable gas production rate of the coal bed gas well reaches 700 cubic meters per day, the production is stably increased by 500 cubic meters per day compared with the production before measures, and the stable gas production rate is maintained for 60 days.
Example 2
The selected coal bed gas well in the embodiment is a coal bed gas well in the northern part of Zhengzhuang district of Qinan Shanxi, and the coal bed gas well is mined by a coal bed No. 3 of the Shanxi group of the two-fold system, the depth of the coal bed is 902.80-909.05 meters, and the thickness of the coal bed is 6.25 meters. Tests show that the mineral filled in the coal reservoir is mainly carbonate mineral with the content of 3 percent and is secondly clay mineral with the content of 27 percent.
Referring to fig. 4, fig. 4 is a flowchart of a coal bed methane mining method provided in embodiment 2 of the present application, where the coal bed methane mining method includes:
And 403, injecting 80 cubic meters of pad fluid into the coal-bed gas well by using a fracturing truck group, wherein the injection amount of the pad fluid is gradually increased from 0.65 cubic meter per minute to 6.55 cubic meters per minute.
And step 404, injecting 330 cubic meters of sand-carrying liquid into the coal-bed gas well injected with the pad fluid by using a fracturing truck group, wherein the volume of the natural quartz sand in the sand-carrying liquid is 32 cubic meters, and the liquid injection amount of the sand-carrying liquid is kept between 6.53 cubic meters and 7.03 cubic meters per minute.
And 406, injecting 35 cubic meters of mineral dissolved acid liquor into the coal bed gas well injected with the first auxiliary industrial acid liquor by using the fracturing truck group, wherein the injection amount of the mineral dissolved acid liquor is 1.4-2 cubic meters per minute.
And 407, injecting 16 cubic meters of second auxiliary industrial acid liquor into the coal-bed gas well injected with the mineral dissolved acid liquor by using the fracturing truck group, wherein the injection amount of the second auxiliary industrial acid liquor is 1.4-2 cubic meters per minute.
And 408, injecting 15 cubic meters of displacement fluid into the coal bed gas well into which the second auxiliary industrial acid liquid is injected by adopting a fracturing truck group.
And step 409, plugging the coal-bed gas well injected with the displacement fluid for 48 hours.
And 4010, after 48 hours, discharging the liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe.
And 4011, mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
After the coal bed gas well is reformed by using the coal bed gas exploitation method provided by the embodiment, the maximum gas production rate of the coal bed gas well reaches 2581 cubic meters per day, the stable gas production rate reaches 1500 cubic meters per day, and the stable gas production rate is maintained for 1.5 years.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (10)
1. A method of mining coal bed methane, the method comprising:
injecting a pad fluid into the coal-bed gas well by adopting a fracturing truck group;
injecting a sand-carrying liquid into the coal-bed gas well into which the pad fluid is injected by adopting the fracturing truck group;
injecting a first auxiliary industrial acid solution into the coal-bed gas well injected with the sand-carrying liquid by adopting the fracturing truck group;
injecting a mineral dissolved acid solution into the coal-bed gas well injected with the first auxiliary industrial acid solution by using the fracturing truck group;
injecting a second auxiliary industrial acid solution into the coal-bed gas well injected with the mineral dissolved acid solution by using the fracturing truck group;
injecting a displacement fluid into the coal bed gas well into which the second auxiliary industrial acid liquid is injected by adopting the fracturing truck group;
plugging the coal bed gas well injected with the displacement fluid;
after the target duration, discharging liquid injected into the coal bed gas well by using an oil nozzle or an oil pipe;
and mining the coal bed gas in the coal bed gas well by using an oil pumping unit.
2. The method of claim 1,
the mineral dissolving acid solution comprises: hydrogen chloride in an amount of 15% and hydrogen fluoride in an amount of 3%.
3. The method of claim 1,
the first auxiliary industrial acid liquid and the second auxiliary industrial acid liquid both comprise: hydrogen chloride in an amount of 15%.
4. The method according to claim 2 or 3,
the mineral-dissolving acid, the first auxiliary industrial acid, and the second auxiliary industrial acid each further comprise: corrosion inhibitor with a content of 1%.
5. The method of claim 1,
the pad fluid and the displacement fluid both comprise: potassium chloride in an amount of 1% to 2%.
6. The method of claim 1,
the sand-carrying fluid comprises: potassium chloride in the content of 1 to 2 percent and natural quartz sand.
7. The method of claim 6,
the volume of the natural quartz sand in the sand-carrying liquid injected into the coal bed gas well is positively correlated with the thickness of a coal reservoir layer into which the coal bed gas well extends.
8. The method of claim 1,
the total volume of the liquid of the pad fluid, the sand-carrying fluid, the first auxiliary industrial acid fluid, the mineral dissolved acid fluid, the second auxiliary industrial acid fluid and the displacing fluid injected into the coal-bed gas well is positively correlated with the thickness of the coal reservoir into which the coal-bed gas well extends.
9. The method of claim 1,
the target time period is greater than or equal to 48 hours.
10. The method of claim 1,
in the process of injecting a pad fluid, a sand-carrying fluid, a first auxiliary industrial acid fluid, a mineral substance dissolving acid fluid, a second auxiliary industrial acid fluid and a displacement fluid into the coal bed gas well by using the fracturing truck group, the injection amount of the liquid per minute of the fracturing truck group is 2-6 cubic meters;
and in the process of discharging the liquid in the coal bed gas well by using the oil nozzle or the oil pipe, the discharge amount of the liquid per hour is 1 cubic meter.
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| US5168930A (en) * | 1989-10-17 | 1992-12-08 | Ben W. Wiseman | Desiccant for well acidizing process |
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| US5168930A (en) * | 1989-10-17 | 1992-12-08 | Ben W. Wiseman | Desiccant for well acidizing process |
| US20100282471A1 (en) * | 2008-10-29 | 2010-11-11 | ACT Operating Company | Hydraulic fracturing of subterranean formations |
| CN104975840A (en) * | 2015-06-18 | 2015-10-14 | 中国石油化工股份有限公司 | Self-born acid composite acid fracturing process for high-temperature deep well carbonate rock reservoir |
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