CN112761585A - Process method for improving yield of coal-bed gas well - Google Patents
Process method for improving yield of coal-bed gas well Download PDFInfo
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- CN112761585A CN112761585A CN202110074131.4A CN202110074131A CN112761585A CN 112761585 A CN112761585 A CN 112761585A CN 202110074131 A CN202110074131 A CN 202110074131A CN 112761585 A CN112761585 A CN 112761585A
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- coal
- well
- gas
- heating
- coal bed
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 15
- 239000003245 coal Substances 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000004321 preservation Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 238000003795 desorption Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 29
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000047 product Substances 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
-
- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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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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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a process method for improving the yield of a coal-bed gas well. The method comprises the following specific steps: 1) putting a heating cable into the wellhead of the gas production well, and placing the heating section in a horizontal well coal seam section of the gas production well; 2) closing a wellhead valve, and electrifying and heating; 3) when the temperature of the coal on the inner surface of the horizontal well hole reaches the range of 100-200 ℃, continuously heating the coal bed for 48-72 hours in a heat preservation way; 4) and after the heat preservation and heating are finished, the heating cable is lifted out, the gate of the cable injection port is closed, and the production valve is opened for production. The invention heats the coal bed in the near well zone to form a strong disturbance effect, water in the pores is evaporated and escaped, the gas volume is expanded, the coal surface and particles can also generate micro displacement or generate new cracks, because the desorption of the coal bed gas is an endothermic reaction, the heating temperature rise supplements the heat required by the desorption of the coal bed gas, promotes the desorption and migration of the coal bed gas, further promotes the permeability of the coal bed, systematically improves the seepage flow channel of the coal bed gas, simultaneously enlarges the gas production wave and body of the coal bed gas and improves the yield of the coal bed gas well.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a process method for improving the yield of a coal-bed gas well by heating a coal bed at the horizontal section of the coal-bed gas horizontal well.
Background
The well completion of the current horizontal well for coal bed gas production generally adopts screen pipe well completion or perforation fracturing well completion. Many wells cause the reduction of the seepage capability of coal beds due to the pollution in the drilling process and the blockage of pulverized coal in the drainage and production process, particularly, some coal beds with less water content often form a water lock with cracks close to the well, so that the seepage resistance of coal bed gas is increased, the continuous desorption and expansion of the coal bed gas from the periphery of a shaft to the deep part are limited, the reduction of gas production rate causes the insufficient seepage capability, and finally, the production can only be stopped. For these wells over-injection (carbon dioxide, nitrogen) or flushing is used, but with limited effectiveness, mainly in the case of blocked channels and sometimes secondary pollution.
Disclosure of Invention
In view of the technical defects, the invention aims to provide a process method for improving the yield of a coal-bed gas well, which can generate disturbance on the coal bed around a shaft, unlock water lock, improve the permeability of the coal bed, supplement energy required by desorption of the coal bed gas, systematically improve a seepage channel of the coal bed gas, expand a production swept volume and further improve the yield of the coal-bed gas well by heating the coal bed near the shaft zone.
In order to solve the technical problems, the invention adopts the following technical scheme:
the process method for improving the yield of the coal bed gas well is characterized by comprising the following specific steps of:
1) putting a heating cable into the wellhead of the gas production well, and placing the heating section in a horizontal well coal seam section of the gas production well;
2) closing a wellhead valve and starting to electrify and heat;
3) when the temperature of the coal on the inner surface of the horizontal borehole reaches the range of 100-200 ℃, continuing to heat the coal bed for 48-72 hours;
4) and after the heat preservation and heating operation is finished, the heating cable is lifted out, the gate of the cable injection port is closed, and the production valve is opened for production.
And further, when the yield of the gas production well is smaller than a set value, repeating the steps 1-4 to perform yield increase operation again.
Further, the heating cable is provided with a continuous tube sheath.
Furthermore, the heating cable is provided with a group of temperature measuring sensors for the surface of the horizontal well coal bed.
And further, a heat insulation packer is arranged at the connecting section of the horizontal well horizontal section and the vertical well of the gas production well.
The invention has the beneficial effects that: the near-well zone coal bed is heated to form a strong disturbance effect, so that moisture in pores is evaporated and escaped, the volume of gas is expanded, the surface and particles of coal can also generate micro-displacement or generate new cracks, and the desorption of the coal bed gas is an endothermic reaction, so that the heating temperature rise supplements the heat required by the desorption of the coal bed gas, promotes the desorption and migration of the coal bed gas, further promotes the permeability of the coal bed, systematically improves a coal bed seepage channel, simultaneously enlarges coal bed gas production waves and gas bodies, and improves the yield of the coal bed gas well.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a process for improving the yield of a coal-bed gas well according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A process method for improving the yield of a coal bed gas well comprises the following specific steps:
1) putting a heating cable into the wellhead of the gas production well, and placing the heating section in a horizontal well coal seam section of the gas production well; the heating cable is provided with a continuous pipe sheath; the heating cable is provided with a group of temperature measuring sensors for the surface of the horizontal well coal bed; a horizontal section of a horizontal well of the gas production well and a vertical well connecting section are provided with heat insulation packers so as to reduce the loss of heat to the vertical well;
2) closing a wellhead valve and starting to electrify and heat; the temperature rise condition in the well is closely concerned through a temperature measuring sensor on the surface of the coal seam of the horizontal well, and the pressure change condition is closely concerned through a pressure gauge at the well head;
3) when the temperature of the coal on the inner surface of the horizontal borehole reaches the range of 100-200 ℃, continuing to heat the coal bed for 48-72 hours; the temperature reaches more than 120 ℃, so that the moisture can be ensured to be in a gaseous state, and the heat preservation can ensure enough heat waves and areas;
4) after the heat preservation and heating operation is finished, the heating cable is taken out, the gate of the cable injection port is closed, and the production valve is opened for production; and when the yield of the gas production well is less than a set value, repeating the steps 1-4 to perform yield increasing operation again.
The pyrolysis at higher temperature of the process method comprises the reaction at the temperature, and the pyrolysis can produce products with business benefits;
it will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The process method for improving the yield of the coal bed gas well is characterized by comprising the following specific steps of:
1) putting a heating cable into the wellhead of the gas production well, and placing the heating section in a horizontal well coal seam section of the gas production well;
2) closing a wellhead valve and starting to electrify and heat;
3) when the temperature of the coal on the inner surface of the horizontal borehole reaches the range of 100-200 ℃, continuing to heat the coal bed for 48-72 hours;
4) and after the heat preservation and heating operation is finished, the heating cable is lifted out, the gate of the cable injection port is closed, and the production valve is opened for production.
2. The process method for improving the yield of the coal-bed gas well is characterized by further comprising the step of repeating the steps 1-4 to perform yield increasing operation again when the yield of the gas well is smaller than a set value.
3. The process for improving the productivity of coal-bed gas wells as claimed in claim 1, wherein the heating cable is sheathed with a continuous tube.
4. A process for improving the productivity of coal-bed gas wells as claimed in claim 1 or claim 3 wherein the heating cable is provided with a set of temperature sensors for measuring the temperature of the surface of the coal bed in a horizontal well.
5. The process method for improving the yield of the coal-bed gas well is characterized in that a thermal insulation packer is arranged at a connecting section of a horizontal well section and a vertical well of the gas well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110074131.4A CN112761585A (en) | 2021-01-20 | 2021-01-20 | Process method for improving yield of coal-bed gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110074131.4A CN112761585A (en) | 2021-01-20 | 2021-01-20 | Process method for improving yield of coal-bed gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112761585A true CN112761585A (en) | 2021-05-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110074131.4A Pending CN112761585A (en) | 2021-01-20 | 2021-01-20 | Process method for improving yield of coal-bed gas well |
Country Status (1)
| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913222A (en) * | 2012-11-20 | 2013-02-06 | 中国石油集团长城钻探工程有限公司工程服务公司 | Oxidation process completion method of horizontal well for developing coalbed methane |
| CN103291244A (en) * | 2013-06-21 | 2013-09-11 | 沈阳摩根能源装备有限公司 | Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit |
| WO2017007732A1 (en) * | 2015-07-03 | 2017-01-12 | Gas Sensing Technology Corp. | Coal seam gas production determination |
| CN106884638A (en) * | 2017-04-14 | 2017-06-23 | 太原理工大学 | A kind of In Situ Heating method of coal bed gas heating exploitation |
| CN110578508A (en) * | 2019-08-05 | 2019-12-17 | 邓惠荣 | Horizontal well one-well multi-mining combined coal bed gas mining and coal gasification method |
| CN111561303A (en) * | 2020-04-13 | 2020-08-21 | 中国地质大学（北京） | Device and method for improving low-coal-rank coal bed gas yield by heating coal reservoir |
-
2021
- 2021-01-20 CN CN202110074131.4A patent/CN112761585A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913222A (en) * | 2012-11-20 | 2013-02-06 | 中国石油集团长城钻探工程有限公司工程服务公司 | Oxidation process completion method of horizontal well for developing coalbed methane |
| CN103291244A (en) * | 2013-06-21 | 2013-09-11 | 沈阳摩根能源装备有限公司 | Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit |
| WO2017007732A1 (en) * | 2015-07-03 | 2017-01-12 | Gas Sensing Technology Corp. | Coal seam gas production determination |
| CN106884638A (en) * | 2017-04-14 | 2017-06-23 | 太原理工大学 | A kind of In Situ Heating method of coal bed gas heating exploitation |
| CN110578508A (en) * | 2019-08-05 | 2019-12-17 | 邓惠荣 | Horizontal well one-well multi-mining combined coal bed gas mining and coal gasification method |
| CN111561303A (en) * | 2020-04-13 | 2020-08-21 | 中国地质大学（北京） | Device and method for improving low-coal-rank coal bed gas yield by heating coal reservoir |
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Application publication date: 20210507 |
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