CN112761585A - Process method for improving yield of coal-bed gas well - Google Patents

Process method for improving yield of coal-bed gas well Download PDF

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Publication number
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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CN202110074131.4A
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Chinese (zh)
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王柱军
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods 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

Process method for improving yield of coal-bed gas well
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.
CN202110074131.4A 2021-01-20 2021-01-20 Process method for improving yield of coal-bed gas well Pending CN112761585A (en)

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)

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CN112761585A true CN112761585A (en) 2021-05-07

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Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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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