CN108533223B - Residual coal bed gas extraction and utilization system in underground goaf - Google Patents
Residual coal bed gas extraction and utilization system in underground goaf Download PDFInfo
- Publication number
- CN108533223B CN108533223B CN201810143840.1A CN201810143840A CN108533223B CN 108533223 B CN108533223 B CN 108533223B CN 201810143840 A CN201810143840 A CN 201810143840A CN 108533223 B CN108533223 B CN 108533223B
- Authority
- CN
- China
- Prior art keywords
- extraction pipe
- well
- ground
- valve
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/005—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of dissimilar working principle
Abstract
A system and a method for extracting and utilizing residual coalbed methane in an underground goaf are suitable for extracting and utilizing residual coalbed methane in the underground goaf of high-gas coalbeds with various inclination angles. A ground drilling is constructed from the ground to the main air return roadway vertically until the ground drilling is communicated with the air return roadway, and an extraction pipe I is inserted into the constructed drilling. And after the stoping is finished, pre-burying an extraction pipe II at one side of the goaf close to the return airway, arranging a slot on the extraction pipe II and protecting the slot by using a wood crib. And connecting the extraction pipe I with the extraction pipe II. A water ring vacuum pump, a screw rod booster pump and an adsorption tower are sequentially installed at a ground well drilling wellhead, so that residual coalbed methane in the underground goaf is extracted to the ground through an extraction pipe I and an extraction pipe II, the concentration of the coalbed methane is improved through the adsorption tower, and extraction and utilization of the residual coalbed methane in the underground goaf are realized. The invention reduces the gas accident under the well. The method has the advantages of low energy consumption, high efficiency, simplicity and easiness in implementation, and can generate huge economic benefits.
Description
Technical Field
The invention relates to a system for extracting and utilizing residual coalbed methane in an underground goaf, which is particularly suitable for extracting and utilizing residual coalbed methane in the underground goaf of high-gas coalbeds with various inclination angles.
Background
Coal mining in China is mostly underground operation, and the gas content of a mine is generally high. Goafs are formed after the underground working face is stoped, and a large amount of methane gas can be gradually desorbed by the residual coal and coal pillars scattered in the goafs. Methane is a main component of coal bed gas, is a clean energy source, and can be used as automobile gas, gas for residents to live, power generation and the like. The method for extracting residual coalbed methane in the underground goaf at the present stage in China mainly comprises the step of arranging a conventional buried pipe for extracting coalbed methane in the underground goaf. However, the conventional pipe burying method has a small extraction range, and cannot effectively extract residual coal bed gas in the goaf.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system for extracting and utilizing residual coalbed methane in an underground goaf with high extraction efficiency. The method comprises the steps of firstly, vertically constructing a ground well from the ground to a main return airway, communicating the ground well with the main return airway, then connecting an extraction pipe inserted into the ground well with an extraction pipe inserted into a goaf, and then sequentially installing a water ring vacuum pump, a screw rod booster pump and an adsorption tower at a wellhead to realize extraction and utilization of residual coal bed gas in the underground goaf.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
a. constructing a ground drilling well with the diameter of 113 and 155mm vertically from the ground to the main return airway so as to ensure that the drilling well is communicated with the main return airway;
b. inserting a casing pipe with the diameter of 110-152mm into the ground well to a position 15-20cm beyond the bottom of the ground well, and sealing the space between the bottom of the ground well and the casing pipe by using cement to form a hole sealing section I;
c. sealing the space between the upper part of the ground drilling well and the casing with cement to form a hole sealing section II;
d. inserting an extraction pipe I with the diameter of 108-;
e. embedding an extraction pipe II with the diameter of 108-;
f. a slit groove with the length of 30-50cm is arranged on the extraction pipe II and is protected by a wood crib;
g. connecting the extraction pipe I with the extraction pipe II by using a flange plate;
h. arranging a first valve at a wellhead of the ground well drilling, arranging a second valve at the joint of the extraction pipe I and the extraction pipe II, and closing the first valve and the second valve;
i. and a water ring vacuum pump, a screw booster pump and an adsorption tower are sequentially arranged at the well mouth, and a first valve and a second valve are opened.
The invention has the beneficial effects that:
(1) the problem of small extraction effect of the conventional buried pipe extraction method for extracting the coal bed gas in the underground goaf is solved. Greatly improves the extraction effect and is easy to popularize and apply on site.
(2) Residual coalbed methane in the underground goaf is efficiently pumped out through the pumping pipe I and the pumping pipe II by utilizing a water ring vacuum pump and a screw booster pump which are installed on the ground, and the concentration of the coalbed methane is improved through the adsorption tower, so that the process is simple, safe and reliable.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: 1. the method comprises the following steps of ground 2, ground drilling, 3, a main air return roadway, 4, a sleeve, 5, cement, 6, hole sealing sections I and 7, hole sealing sections II and 8, extraction pipes I and 9, a goaf, 10, an air return roadway, 11, extraction pipes II and 12, a slot, 13, a wood buttress, 14, a flange plate, 15, a wellhead, 16, a first valve, 17, a second valve, 18, a water ring vacuum pump, 19, a screw rod booster pump, 20 and an adsorption tower.
Detailed Description
Examples of the invention are further illustrated below with reference to the accompanying drawings:
as shown in the figure, firstly, a ground well 2 with the diameter of 113-155mm is vertically constructed from the ground 1 to the main return airway 3 to be communicated with the main return airway 3. Then, a casing 4 with the diameter of 110-. And sealing the space between the upper part of the ground drilling well 2 and the casing 4 by using cement 5 to form a hole sealing section II 7. Then, an extraction pipe I8 with the diameter of 108-150mm is inserted into the casing 4 and fixed. In the goaf 9, firstly, an extraction pipe II 11 with the diameter of 108-150mm is pre-buried at the position 3-5m away from the return airway 10. And a slot 12 with the length of 30-50cm is arranged on the extraction pipe II 11 and is protected by a wood crib 13. And then, connecting the extraction pipe I8 with the extraction pipe II 11 by using a flange 14, arranging a first valve 16 at a wellhead 15 of the ground well 2, arranging a second valve 17 at the connection part of the extraction pipe I8 and the extraction pipe II 11, and closing the first valve 16 and the second valve 17. And then a water ring vacuum pump 18, a screw rod booster pump 19 and an adsorption tower 20 are sequentially arranged on the well mouth 15, and the residual coal bed gas in the goaf 9 can be efficiently extracted by opening the first valve 16 and the second valve 17.
Claims (1)
1. A residual coal bed gas extraction and utilization system of an underground goaf comprises a drilling machine and is characterized in that the drilling machine drills a well to the ground, and a drilling well (2) is communicated with a main return airway (3); the casing (4) is arranged in the drilling well (2), and the drilling well (2) and the casing (4) are sealed by cement (5); one end of an extraction pipe I (8) is inserted into the casing pipe (4) and is connected with an extraction pipe II (11) pre-buried in the goaf (9) through a second valve (17), and the other end of the extraction pipe I (8) is located on the ground and is sequentially connected with a first valve (16), a water ring vacuum pump (18), a screw booster pump (19) and an adsorption tower (20);
the diameter of the well (2) is 155mm, the diameter of the casing (4) is 152mm, the diameters of the extraction pipe I (8) and the extraction pipe II (11) are 150mm, the distance between the extraction pipe II (11) and the return airway (10) is 3-5m, the length of the slot (12) is 30-50cm, and the distance between adjacent slots (12) is 30-50 m;
the coal bed gas extraction method comprises the following steps:
a. vertically constructing a ground well from the ground (1) to the main return airway (3) to ensure that the well (2) is communicated with the main return airway (3);
b. inserting a casing (4) into the drilling well (2), and sealing the space between the bottom of the drilling well (2) and the casing (4) by using cement (5) to form a hole sealing section I (6);
c. sealing the space between the upper part of the well drilling (2) and the casing (4) by using cement (5) to form a hole sealing section II (7);
d. an extraction pipe I (8) is inserted into the casing pipe (4) and fixed;
e. an extraction pipe II (11) is pre-buried at one side of the goaf (9) close to the return airway (10);
f. a slot (12) is arranged on the extraction pipe II (11);
g. the slot (12) is protected by a wood stack (13);
h. connecting an extraction pipe I (8) with an extraction pipe II (11) by using a flange plate (14);
i. arranging a first valve (16) at a wellhead (15) of the well (2), arranging a second valve (17) at the connection part of the extraction pipe I (8) and the extraction pipe II (11), and closing the first valve (16) and the second valve (17);
j. a water ring vacuum pump (18), a screw rod booster pump (19) and an adsorption tower (20) are sequentially installed on a well head (15), a first valve (16) and a second valve (17) are opened, and residual coal bed gas in a goaf (9) is efficiently extracted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810143840.1A CN108533223B (en) | 2018-02-12 | 2018-02-12 | Residual coal bed gas extraction and utilization system in underground goaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810143840.1A CN108533223B (en) | 2018-02-12 | 2018-02-12 | Residual coal bed gas extraction and utilization system in underground goaf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108533223A CN108533223A (en) | 2018-09-14 |
| CN108533223B true CN108533223B (en) | 2020-09-11 |
Family
ID=63485993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810143840.1A Active CN108533223B (en) | 2018-02-12 | 2018-02-12 | Residual coal bed gas extraction and utilization system in underground goaf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108533223B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669004A (en) * | 2021-08-11 | 2021-11-19 | 中国煤炭地质总局水文地质局 | Coal bed gas control method |
| CN113803104B (en) * | 2021-09-29 | 2023-07-28 | 太原理工大学 | Method for integrally arranging upper mining area buried pipe and downward drilling and extracting full-period gas |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9309749B2 (en) * | 2009-07-01 | 2016-04-12 | Exxonmobil Upstream Research Company | System and method for producing coal bed methane |
| WO2015157812A1 (en) * | 2014-04-14 | 2015-10-22 | Peabody Energy Australia | A multi purpose drilling system and method |
| CN104481578B (en) * | 2014-11-27 | 2016-04-20 | 辽宁工程技术大学 | A kind of high gas layer large-mining-height working surface mash gas harnessing method |
| CN105114038B (en) * | 2015-08-04 | 2018-01-02 | 太原理工大学 | A kind of system and method for improving the old dead zone coal bed gas extraction amount of ground well drainage |
| CN106223996B (en) * | 2016-09-14 | 2019-11-01 | 山西汾西中兴煤业有限责任公司 | Super-large diameter coal bed drilling is intubated extraction goaf gas technique |
| CN106437632B (en) * | 2016-11-09 | 2018-04-20 | 山西潞安矿业(集团)有限责任公司 | A kind of old goaf gas pumping method in colliery |
| CN106884673B (en) * | 2017-02-25 | 2019-11-12 | 太原理工大学 | A kind of method that goaf coal bed gas pinpoints efficient 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 |
| CN106761754A (en) * | 2017-03-31 | 2017-05-31 | 中国矿业大学 | A kind of girdle comprehensive mining and gas control network one cooperative control system and method |
| CN207485466U (en) * | 2017-11-30 | 2018-06-12 | 梁福和 | Gas at upper corner drainage device during high methane coal working face is just adopted |
-
2018
- 2018-02-12 CN CN201810143840.1A patent/CN108533223B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108533223A (en) | 2018-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020113870A1 (en) | Method for cooperatively draining roof separation water and mining coal-measure gas | |
| CN104405283B (en) | The technique of L-type well mash gas extraction is bored on a kind of minery ground | |
| CN104989339B (en) | A kind of system and method for old dead zone extraction coal bed gas | |
| CN106988719B (en) | Anti-reflection system and anti-reflection method for circularly injecting hot water and liquid nitrogen into coal seam | |
| CN104989356A (en) | Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system | |
| CN105114038A (en) | System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf | |
| CN104234740B (en) | A kind of low middle pressure air displacement high pressure coal seam gas train and method thereof | |
| CN107120087B (en) | Coal bed supercritical carbon dioxide plugging device and method | |
| CN104481580B (en) | A kind of down-hole coal bed mash gas pumping drilling restorative procedure and the device of use thereof | |
| CN205047207U (en) | Colliery binary channels segmentation in pit hydraulic fracturing device | |
| CN103277129B (en) | One prevents Top Corner Gas on Coal Face to transfinite technology | |
| CN109098750B (en) | Device for underground gas extraction hole to be used as coal seam water injection hole and construction method | |
| CN101915086B (en) | Coal mine underground gas borehole fracturing method | |
| CN108533223B (en) | Residual coal bed gas extraction and utilization system in underground goaf | |
| CN205063929U (en) | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device | |
| CN105114116A (en) | Method for strengthening regional gas extraction through hydro-thermal coupling fracturing | |
| CN103883304A (en) | Method for underground coal gasification for gasifier channel establishment | |
| CN113803104B (en) | Method for integrally arranging upper mining area buried pipe and downward drilling and extracting full-period gas | |
| CN203531877U (en) | Underground coal mine fracturing connecting device | |
| CN105804786A (en) | Method for layer penetrating, drilling, pressing punching and permeability improving of soft coal seam floor | |
| CN106930746A (en) | The alternative expression coal seam anti-reflection method that drilling acetone invasion and attack are combined with hydraulic fracturing | |
| CN206957684U (en) | A kind of roof fracturing system | |
| CN201874543U (en) | Underground boosting water injection process pipe string | |
| CN105401973A (en) | Method for performing extraction treatment on corner gas on work faces of adjacent roadways | |
| CN115492557B (en) | Deep non-recoverable coal seam CO 2 Sealing and storing device and method for extracting coalbed methane under negative pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |