CN114856499A - Method for improving yield of coal-bed gas well by generating carbon dioxide through in-situ oxidation - Google Patents
Method for improving yield of coal-bed gas well by generating carbon dioxide through in-situ oxidation Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 44
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 44
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000003647 oxidation Effects 0.000 title claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 96
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000007789 gas Substances 0.000 claims abstract description 54
- 230000001590 oxidative effect Effects 0.000 claims abstract description 46
- 239000007800 oxidant agent Substances 0.000 claims abstract description 39
- 239000000243 solution Substances 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
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Abstract
The invention belongs to the field of oil and natural gas exploitation, and provides a method for improving the yield of a coal bed gas well by generating carbon dioxide through in-situ oxidation, which comprises the following steps: step 1, drilling two horizontal wells in a coal bed rich in methane: the system comprises a liquid injection well and a gas production well positioned below the liquid injection well; step 2, injecting an oxidant solution into the coal bed through a liquid injection well, so that the oxidant solution has an oxidizing effect on the coal bed; and 3, extracting the methane which seeps into the extraction well to the ground when the oxidant solution performs oxidation on the coal bed. According to the invention, after the oxidant solution is injected into the underground to perform oxidation reaction with coal, carbon dioxide is generated in situ and methane is replaced, so that the methane desorption capacity and seepage capacity of a coal bed can be effectively enhanced, and the methane recovery ratio is increased. Secondly, the oxidant solution is heated to a certain temperature by a heating device, and the oxidation reaction rate and the carbon dioxide generation amount corresponding to different temperatures are different, so that the reaction is controllable, and the yield of the coal-bed gas well is improved.
Description
Technical Field
The invention belongs to the field of oil and natural gas exploitation, and particularly relates to a method for improving the yield of a coal-bed gas well by generating carbon dioxide through in-situ oxidation.
Background
The coal bed gas is a gas generated in the coal-forming process, mainly contains methane, and belongs to unconventional natural gas.
72 percent of coal seams mined by coal mines in China are low-rank coal seams, wherein the permeability of the low-rank coal seams is generally less than 1.0 multiplied by 10 -3 μm 2 Under the adverse conditions of coal bed under-pressure, under-saturation, poor permeability and the like, the yield of the low-coal-rank coal-bed gas well is generally low and is generally between 500 and 2356m 3 And d is between. The coal bed has the structural characteristics of matrix pores and fractures, the matrix pores adsorb gas, which is a place where the adsorbed gas in the coal bed gas exists, the adsorbed gas accounts for 80-90% of the total gas content and is an important component of the coal bed gas, but the adsorbed gas is difficult to desorb in the extraction process of the coal bed gas, so that the extraction rate of the coal bed gas is generally low. Therefore, two key factors which currently limit the yield increase of the coal-bed gas well are low coal-bed air permeability and difficult methane desorption.
In order to overcome the problems and improve the recovery ratio of the coal bed gas, external force is applied to the coal bed to increase the permeability of the coal bed in the prior art, the common technology is a hydraulic fracturing technology, but a local high-stress area exists after hydraulic fracturing, and gas outburst is easily caused. And the fracturing fracture is unsupported and closed too fast, a large amount of coal dust is generated due to severe disturbance induction of a coal bed, the fracture is easy to be blocked by the coal dust in the extraction process, so that the permeability is reduced in the later stage of fracturing, and the actual recovery ratio is not greatly improved.
In the prior art, a method for enhancing methane desorption mainly comprises a physical field excitation method or a method for injecting non-hydrocarbon gas, wherein the physical field excitation method enhances methane desorption, and comprises the technologies of acoustic shock, an electromagnetic field, controllable source microwave field radiation and the like, so that the temperature of coal can be improved, energy is provided for methane gas desorption, and simultaneously coal is promoted to form a damage effect to cause pore structure change so as to promote methane desorption; the non-hydrocarbon gas is injected to the coal bed by forming competitive adsorption with methane gas in the coal bed or reducing the partial pressure of methane in free gas, thereby promoting the desorption of methane from the coal bed and finally improving the recovery ratio of the coal bed gas. The injection gas is generally nitrogen, carbon dioxide, a mixture of nitrogen and carbon dioxide, flue gas and the like, but the injection of carbon dioxide under formation conditions induces coal expansion, resulting in difficulty in later injection.
The existing methods or measures for promoting desorption of coal bed adsorbed gas all have certain defects, and in order to solve the technical defects in the prior art, the method for generating carbon dioxide by in-situ oxidation to improve the yield of the coal bed gas well is provided.
Disclosure of Invention
The invention aims to solve the problems recorded in the background technology and provides a method for generating carbon dioxide by in-situ oxidation to improve the yield of a coal-bed gas well.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for improving the yield of a coal-bed gas well by generating carbon dioxide through in-situ oxidation comprises the following steps:
step 1, drilling two horizontal wells in a coal bed rich in methane, wherein the two horizontal wells comprise a liquid injection well and a gas recovery well positioned below the liquid injection well;
step 2, injecting an oxidant solution into the coal bed through a liquid injection well, so that the oxidant solution has an oxidizing effect on the coal bed;
and 3, extracting the methane which seeps into the extraction well to the ground when the oxidant solution performs oxidation on the coal bed.
In a preferred embodiment of the present invention, step 1, the coal seam is a low-rank coal seam having an oxygen content of more than 18%.
In a preferred embodiment of the invention, in step 1, after the injection well is drilled, a first high-pressure pump is installed at the wellhead of the injection well, a heating device and a second high-pressure pump are installed in the injection well, the first high-pressure pump is communicated with the heating device, and the heating device is communicated with the second high-pressure pump.
In a preferred embodiment of the present invention, in step 2, the oxidation solvent is fed to the heating device for heating by the first high-pressure pump and then fed into the coal seam by the second high-pressure pump.
In a preferred embodiment of the present invention, in step 2, the oxidant solution is heated to 40 to 80 ℃ by a heating device.
In a preferred embodiment of the present invention, in step 2, the oxidizer solution is prepared by dissolving a solid or liquid oxidizer having strong oxidizing property in water.
In a preferred embodiment of the present invention, the oxidant solution includes 3 to 6% by mass of ammonium persulfate or 15 to 30% by mass of hydrogen peroxide.
In a preferred embodiment of the invention, in step 2, the oxidation time is from 1d to 7 d.
The principle and the beneficial effects of the invention are as follows:
1. adding oxidant solution to a certain temperature through a heating device in a liquid injection well, injecting the oxidant solution into a coal bed, enabling the oxidant solution to be fully contacted with coal, enabling the oxidant solution to be capable of oxidatively decomposing organic matters in the coal to generate carbon dioxide in situ, replacing methane adsorbed in coal pores by the carbon dioxide, enabling the adsorption capacity of the coal to the carbon dioxide to be far higher than that of the methane, when the carbon dioxide concentration in a coal bed space is properly improved, the advantages of the coal surface to carbon dioxide adsorption are gradually amplified relative to the methane under the same pressure condition, enabling the adsorption balance of the methane to be changed due to the change of the carbon dioxide concentration, and promoting the desorption process of the methane.
2. The carbon dioxide generated in situ by the oxidative decomposition of organic matters in the coal replaces the adsorbed methane, so that the desorption efficiency of the adsorbed gas is improved, and the methane recovery ratio is improved. Secondly, the oxidant can oxidize and decompose organic matters in the coal to generate corrosion pores, the pore diameter of the organic matters is enlarged, the permeability of the coal bed is increased, methane is easy to seep out through a pore fracture system, and the yield of the coal bed gas well is improved.
3. After the oxidizing liquid is injected into the heating device, the temperature of the oxidizing liquid is raised to a certain temperature by the heating device, and the corresponding oxidation reaction rate and the carbon dioxide generation amount are different at different temperatures, so that the reaction is controllable.
4. The oxidant reacts with part of coal, so that the problems of later-stage coal expansion and fracture closure can be avoided, and the permeability of the coal bed is effectively increased.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a coal seam structure of the method for increasing the yield of a coal seam gas well by generating carbon dioxide through in-situ oxidation according to the invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The application provides a method for generating carbon dioxide through in-situ oxidation to improve yield of a coal bed gas well, which comprises the following steps:
step 1, as shown in attached figure 1, drilling two horizontal wells in a coal seam rich in methane (the coal seam suitable for the coal seam is a low-rank coal seam with oxygen content exceeding 18%, such as a lignite coal seam and a long flame coal seam), wherein one horizontal well is a liquid injection well, the other horizontal well is a methane gas production well, the liquid injection well is used for injecting prepared oxidant solution, the gas production well is used for extracting methane replaced after carbon dioxide is generated by oxidation, a first high-pressure pump is installed at a wellhead of the liquid injection well, a heating device and a second high pressure are installed in a shaft of the liquid injection well, and the heating device is communicated with the second high-pressure pump.
And 2, providing initial power through a first high-pressure pump, injecting the oxidant solution into a heating device in the injection well, heating the oxidant solution to 40-80 ℃ through the heating device, and finally injecting the heated oxidant solution into the coal bed through a second high-pressure pump until the oxidant solution has an oxidizing effect on the coal bed. The oxidant solution is prepared by dissolving a solid or liquid oxidant with strong oxidizing property in water, in the embodiment, the oxidant solution includes any one of ammonium persulfate with a mass concentration of 3-6% or hydrogen peroxide with a mass concentration of 15-30%, and in the embodiment, hydrogen peroxide with a mass concentration of 30% is adopted. The oxidation time is 1d to 7d, in this embodiment, after the oxidative degradation of coal is completed, the carbon conversion rate of carbon dioxide generated is 5% to 50% based on the carbon content in raw coal, and the specific conversion rate varies with the carbon content in the coal seam and the temperature to which the oxidant is heated. And injecting the oxidant solution into the coal bed to generate carbon dioxide in the coal bed to replace methane and promote methane desorption.
Oxidizing coal to generate carbon dioxide: hydrogen peroxide generates OH (hydroxyl radical) to break weak-C-O-bonds in coal macromolecules, introduce O and H, and generate a large amount of water-soluble macromolecular compounds and carbon dioxide. By utilizing the fact that the adsorption capacity of coal to carbon dioxide is far higher than that of methane, when the concentration of carbon dioxide in a coal bed space is properly improved, the advantage of the coal surface to carbon dioxide adsorption is gradually amplified relative to methane under the same pressure condition, so that the adsorption balance of methane is changed due to the change of the concentration of carbon dioxide, and the desorption process of methane is promoted.
And 3, pumping the methane seeped into the gas production well to the ground when the oxidation solvent performs oxidation on the coal bed, so as to avoid methane enrichment. When the above steps are completed, the oxidant is consumed and the liquid in the gas layer is returned.
In conclusion, in the embodiment, the method for replacing adsorbed methane by carbon dioxide generated in situ through oxidative decomposition of organic matters in coal, so that the desorption efficiency of adsorbed gas is improved, and the methane recovery rate is improved can effectively solve the problem that the existing low-coal-rank coal-bed methane is difficult to desorb and the gas permeability is low, so that the yield of a coal-bed gas well is difficult to increase efficiently. And secondly, the problems that coal powder blocks a seepage channel and non-hydrocarbon gas is injected to reinforce later-stage coal expansion and gas injection is difficult in the desorption reinforcing technology in the existing desorption reinforcing technology of the coal bed gas can be effectively solved.
According to the method, a horizontal well is drilled in a coal seam, an oxidant solution heated to a certain temperature is injected into the coal seam through a liquid injection well, the oxidant solution is fully contacted with coal, the oxidant can oxidize and decompose organic matters in the coal to generate carbon dioxide in situ, the carbon dioxide can displace methane adsorbed in coal pores, and the methane can diffuse into fracture channels after being desorbed and seep into extraction wells to be extracted out of the ground. The methane desorption capacity and seepage capacity of the coal bed are effectively enhanced through the replacement effect of in-situ generated carbon dioxide, so that the methane recovery ratio is improved.
In this embodiment, the oxidant solution injected into the coal seam is heated to a specified temperature by the heating device, the oxidation rate and the amount of generated carbon dioxide can be increased by the high temperature, and the rate and the amount of generated carbon dioxide can be controlled by the heating temperature.
In the embodiment, the method has the advantages of obvious enhanced desorption effect, low technical difficulty of field application, small coal bed disturbance and the like, and is not limited by conditions such as coal bed geological structure conditions, damage of top and bottom plates or roadway surrounding rocks, hardness of coal and the like.
In the embodiment, high-pressure operation is not needed in the implementation process, and the implementation difficulty is low. The oxidant adopted in the implementation process does not have corrosive and toxic components, and is safe to workers and the environment. The implementation process does not cause pollution of an underground water system and secondary pollution of the surrounding environment.
In the description herein, references to the description of the term "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The method for improving the yield of the coal bed gas well by generating the carbon dioxide through in-situ oxidation is characterized by comprising the following steps:
step 1, drilling two horizontal wells in a coal bed rich in methane, wherein the two horizontal wells comprise a liquid injection well and a gas recovery well positioned below the liquid injection well;
step 2, injecting an oxidant solution into the coal bed through a liquid injection well, so that the oxidant solution has an oxidizing effect on the coal bed;
and 3, extracting the methane which seeps into the extraction well to the ground when the oxidant solution performs oxidation on the coal bed.
2. The method for improving the yield of coal-bed gas wells by generating carbon dioxide through in-situ oxidation as claimed in claim 1, wherein in step 1, the coal bed is a low-rank coal bed with oxygen content exceeding 18%.
3. The method for improving the yield of the coal-bed gas well by generating the carbon dioxide through in-situ oxidation according to claim 2, wherein in the step 1, after the liquid injection well is drilled, a first high-pressure pump is installed at the well head of the liquid injection well, a heating device and a second high-pressure pump are installed in the liquid injection well, the first high-pressure pump is communicated with the heating device, and the heating device is communicated with the second high-pressure pump.
4. The method for improving the yield of the coal-bed gas well by generating the carbon dioxide through in-situ oxidation as claimed in claim 3, wherein the oxidant solution comprises 3-6% of ammonium persulfate or 15-30% of hydrogen peroxide by mass concentration.
5. The method for improving the yield of the coal-bed gas well by generating the carbon dioxide through in-situ oxidation according to claim 4, wherein in the step 2, the oxidation solvent is fed into a heating device through a first high-pressure pump to be heated and then is fed into the coal bed through a second high-pressure pump.
6. The method for improving the yield of the coal-bed gas well by generating the carbon dioxide through in-situ oxidation according to claim 5, wherein in the step 2, the oxidant solution is heated to 40-80 ℃ through a heating device.
7. The method for improving the yield of the coal-bed gas well by generating the carbon dioxide through in-situ oxidation as claimed in claim 6, wherein in the step 2, the oxidation time is 1d to 7 d.
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Application publication date: 20220805 |