CN110863801A - Method for changing coalbed methane pre-pumping well into mining well - Google Patents
Method for changing coalbed methane pre-pumping well into mining well Download PDFInfo
- Publication number
- CN110863801A CN110863801A CN201911100952.XA CN201911100952A CN110863801A CN 110863801 A CN110863801 A CN 110863801A CN 201911100952 A CN201911100952 A CN 201911100952A CN 110863801 A CN110863801 A CN 110863801A
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- China
- Prior art keywords
- well
- coal bed
- shaft
- bed gas
- mining
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/11—Perforators; Permeators
Abstract
A method for changing a coal bed gas pre-pumping well into a mining well belongs to the field of coal bed gas extraction, can solve the problem that the gas production of a ground coal bed gas well is seriously influenced due to the fact that the number of coal bed gas pre-pumping wells is large in the mining activity damage, selects the coal bed gas well in an area which is 0.15-0.3 times of the length of a working face and is close to the air return side of the working face, removes ground and underground extraction equipment, puts down an underground peeping instrument to peep whether an inner sleeve of a shaft is deformed or damaged, blocks the position below a top plate of the mined coal bed by adopting G-grade cement in a shaft, performs perforation in the shaft with the mining height of 5-8 times of the upper part of the coal bed, puts down a high-strength small-size protective casing after washing the shaft, takes a perforated section as a screen pipe, hangs on a well mouth, selects negative pressure extraction equipment according to the inner diameter of the protective casing, then installs the extraction, and finally, adopting a generator or an overhead line to supply power for extraction, and enabling the produced coal bed gas to enter a gathering and transportation pipeline or be utilized nearby.
Description
Technical Field
The invention belongs to the technical field of coal bed gas extraction, and particularly relates to a method for changing a coal bed gas pre-pumping well into a mining well.
Background
The conventional coal bed gas well is usually required to be closed when damaged after coal mine underground coal is excavated, and a large amount of underground gas is gushed out during underground coal mining to influence coal mining safety, so that the conventional pre-pumping coal bed gas well is reformed in advance before coal mine working face excavation, and the coal bed gas generated in the coal bed mining influence process can still be extracted when the coal mine working face coal mining is carried out.
Disclosure of Invention
The invention provides a method for improving a coal bed gas pre-pumping well into a mining well, aiming at the problem that the gas production of a ground coal bed gas well is seriously influenced due to the fact that the number of coal bed gas pre-pumping wells damaged by mining activities is large.
The invention adopts the following technical scheme:
a method for changing a coalbed methane pre-pumping well into a mining well comprises the following steps:
firstly, selecting a coal bed gas well which is close to a working face air return side and is about to close and seal a well in an area which is 0.15-0.3 times of the length of the working face;
secondly, removing the selected ground extraction equipment and underground extraction equipment of the coal bed gas well;
thirdly, after the ground and underground extraction equipment is removed, putting a peeping instrument into the underground, peeping the inner sleeve of the shaft, and determining that the inner sleeve is intact;
fourthly, adopting high-grade G-grade cement in the shaft to plug the shaft to a position below the coal seam roof of the excavated coal seam;
fifthly, after the top plate of the coal seam of the excavated coal seam is sealed and plugged by cement, perforating is carried out in a shaft with the height 4-9 times of the mining height of the upper part of the coal seam to form a perforating section, 16 holes or 24 holes per meter and the azimuth angle is 90 degrees;
sixthly, after the perforation is finished, the shaft is washed, a protective sleeve is placed and hung on the well mouth, and the bottom of the protective sleeve is flush with the bottom of the perforation section;
and seventhly, selecting negative pressure extraction equipment according to the residual space of the shaft after protective reinforcement is put into the shaft, installing extraction equipment and safety protection equipment on the ground, connecting an extraction pipeline, installing a concentration, pressure and flow data monitoring instrument, and finally adopting a generator or stringing for power supply to extract, wherein the produced coal bed gas is directly emptied, utilized on site or enters a gathering and transportation pipeline.
The perforation section is a slotted sieve tube, the length of the slot is 200mm, the width of the slot is 20mm, and the phase angle is 90 degrees.
The invention has the following beneficial effects:
by the method, the coal bed gas well to be closed and shut down can be changed into the mining well, so that coal bed gas generated in the coal bed mining influence process can be extracted when the coal is mined on the working face, and the generated coal bed gas is directly emptied, utilized on the spot or enters a gathering and transportation pipeline.
Drawings
FIG. 1 is a schematic illustration of a modified production well configuration;
wherein: 1-wellhead ground; 2-surface casing pipe; 3-producing the sleeve; 4-protective sleeves; 5-perforation hole; 6-protective sieve tube; 7-collecting a coal bed; 8-cement plunger; 9-suspension device.
Detailed Description
A method for changing a coalbed methane pre-pumping well into a mining well comprises the following steps:
(1) the selected conventional pre-pumping coal-bed gas well is a coal-bed gas well which is about to be shut down and sealed, and the coal-bed gas well in an area which is close to the return air side of the working face and is 0.15-0.3 times the length of the working face is preferentially selected.
(2) The selected coal bed gas well needs to be dismantled from ground extraction equipment such as an oil pumping unit and a cement base, and underground extraction equipment such as an oil pumping pipe and an oil pumping rod.
(3) After the ground and the underground extraction equipment are removed, a downhole peeping instrument is put into the well to peep whether the inner sleeve of the shaft is deformed or damaged, and whether the modification requirement is met is judged.
(4) After the casing is confirmed to be intact, high grade G-grade cement (cement slurry density greater than 1.7G/cm) is used in the wellbore3) Plugging the coal seam to be below the coal seam roof of the excavated coal seam.
(5) After cement is used for plugging the position below a coal seam roof of a coal seam, a fracture zone formed due to the coal seam mining influence is located at the height 5-8 times of the coal seam upper mining height, then, perforation is carried out in a shaft with the height 4-9 times of the coal seam upper mining height, 16 holes or 24 holes per meter are formed, and the azimuth angle is 90 degrees.
(6) After perforation is completed, a shaft is washed through, then a protective casing with high strength and small size (the outer diameter is the inner diameter of a production casing coupling) is put in and hung on a well head, the putting position is the bottom of a perforation section, the perforation section is a slotted sieve tube, the length of a slot is 200mm, the width of the slot is 20mm, and the phase angle is 90 degrees.
(7) After a protective reinforcing pipe column is put into a shaft, negative pressure extraction equipment of a proper model is selected according to the size of the residual space (approximately equal to the inner diameter of the protective pipe column) of the shaft, then the extraction equipment and safety protection equipment are installed on the ground, and are all explosion-proof devices and connected with an extraction pipeline, the safety protection equipment comprises a bypass pipeline, a fire-proof device, an explosion-proof device and the like, in addition, data monitoring instruments such as concentration, pressure, flow and the like need to be installed, finally, extraction is carried out by adopting a generator or overhead line for power supply, and produced coal bed gas is directly emptied, utilized on the spot or enters a gathering and transportation pipeline.
Claims (2)
1. A method for changing a coal bed gas pre-pumping well into a mining well is characterized by comprising the following steps: the method comprises the following steps:
firstly, selecting a coal bed gas well which is close to a working face air return side and is about to close and seal a well in an area which is 0.15-0.3 times of the length of the working face;
secondly, removing the selected ground extraction equipment and underground extraction equipment of the coal bed gas well;
thirdly, after the ground and underground extraction equipment is removed, putting a peeping instrument into the underground, peeping the inner sleeve of the shaft, and determining that the inner sleeve is intact;
fourthly, adopting high-grade G-grade cement in the shaft to plug the shaft to a position below the coal seam roof of the excavated coal seam;
fifthly, after the top plate of the coal seam of the excavated coal seam is sealed and plugged by cement, perforating is carried out in a shaft with the height 4-9 times of the mining height of the upper part of the coal seam to form a perforating section, 16 holes or 24 holes per meter and the azimuth angle is 90 degrees;
sixthly, after the perforation is finished, the shaft is washed, a protective sleeve is placed and hung on the well mouth, and the bottom of the protective sleeve is flush with the bottom of the perforation section;
and seventhly, selecting negative pressure extraction equipment according to the residual space of the shaft after protective reinforcement is put into the shaft, installing extraction equipment and safety protection equipment on the ground, connecting an extraction pipeline, installing a concentration, pressure and flow data monitoring instrument, and finally adopting a generator or stringing for power supply to extract, wherein the produced coal bed gas is directly emptied, utilized on site or enters a gathering and transportation pipeline.
2. The method for improving the mining well of the coalbed methane pre-pumping well according to claim 1, wherein the method comprises the following steps: the perforation section is a slotted sieve tube, the length of the slot is 200mm, the width of the slot is 20mm, and the phase angle is 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100952.XA CN110863801A (en) | 2019-11-12 | 2019-11-12 | Method for changing coalbed methane pre-pumping well into mining well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100952.XA CN110863801A (en) | 2019-11-12 | 2019-11-12 | Method for changing coalbed methane pre-pumping well into mining well |
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| Publication Number | Publication Date |
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| CN110863801A true CN110863801A (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911100952.XA Pending CN110863801A (en) | 2019-11-12 | 2019-11-12 | Method for changing coalbed methane pre-pumping well into mining well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796680A (en) * | 2021-01-04 | 2021-05-14 | 中煤科工集团重庆研究院有限公司 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU721541A1 (en) * | 1977-07-25 | 1980-03-15 | Ордена Трудового Красного Знамени Институт Горного Дела Им.А.А.Скочинского | Method of preventing endoghenic fire in minedout area of frozen ground |
| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
| CN106930730A (en) * | 2017-03-10 | 2017-07-07 | 太原理工大学 | A kind of pumping method of abandoned mine goaf coal bed gas |
| CN109519211A (en) * | 2019-01-15 | 2019-03-26 | 中煤科工集团重庆研究院有限公司 | A method of coal bed gas surface well extraction minery gas is taken out using pre- |
-
2019
- 2019-11-12 CN CN201911100952.XA patent/CN110863801A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU721541A1 (en) * | 1977-07-25 | 1980-03-15 | Ордена Трудового Красного Знамени Институт Горного Дела Им.А.А.Скочинского | Method of preventing endoghenic fire in minedout area of frozen ground |
| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
| CN106930730A (en) * | 2017-03-10 | 2017-07-07 | 太原理工大学 | A kind of pumping method of abandoned mine goaf coal bed gas |
| CN109519211A (en) * | 2019-01-15 | 2019-03-26 | 中煤科工集团重庆研究院有限公司 | A method of coal bed gas surface well extraction minery gas is taken out using pre- |
Non-Patent Citations (1)
| Title |
|---|
| 周雷雷: "煤炭规划区地面煤层气井预抽技术体系", 《煤》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796680A (en) * | 2021-01-04 | 2021-05-14 | 中煤科工集团重庆研究院有限公司 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
| CN112796680B (en) * | 2021-01-04 | 2022-05-03 | 中煤科工集团重庆研究院有限公司 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
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