CN105735958A - Method and system for increasing coal bed gas permeability based on water vapor injection - Google Patents
Method and system for increasing coal bed gas permeability based on water vapor injection Download PDFInfo
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- CN105735958A CN105735958A CN201610272645.XA CN201610272645A CN105735958A CN 105735958 A CN105735958 A CN 105735958A CN 201610272645 A CN201610272645 A CN 201610272645A CN 105735958 A CN105735958 A CN 105735958A
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- water
- coal bed
- water vapor
- coal
- gas
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003245 coal Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000035699 permeability Effects 0.000 title claims abstract description 24
- 238000002347 injection Methods 0.000 title abstract 3
- 239000007924 injection Substances 0.000 title abstract 3
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 238000009835 boiling Methods 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 30
- 238000000605 extraction Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
Classifications
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention provides a method and a system for increasing coal bed gas permeability based on water vapor injection and belongs to the field of exploitation of coal bed methane. The method includes pumping water into a vapor generator by a water pump; generating normal-pressure water vapor, superheated water vapor or boiling water by the vapor generator; enabling the normal-pressure water vapor, the superheated water vapor or the boiling water generated by the vapor generator to pass pipelines and hole packers arranged in a target coal bed and drilling holes in the coal bed to be injected into the coal bed. The method and the system for increasing the coal bed gas permeability based on water vapor injection have the advantages that the normal-pressure water vapor, the superheated water vapor or the boiling water are injected into the target coal bed, on one hand, coal bed temperature is increased to enhance kinetic energy of methane molecules so as to be beneficial to gas resolution; on the other hand, a methane and water crystalline structure is destroyed, so that gas resolution is accelerated greatly, methane flowing passages are dredged, coal bed gas permeability is enhanced to benefit extraction of a great quantity of coal bed methane, high-efficiency cheap clean energy is obtained, mine gas emission quantity is decreased, and coal and gas prominent conditions can be eliminated to guarantee environmental safety of extracting the coal bed methane.
Description
Technical field
The present invention relates to a kind of method increasing gas permeability of coal seam, it is possible to for exploiting coal bed methane, coal mine gas drainage and elimination coal and gas prominent, particularly relate to a kind of based on injecting water vapour to increase method and the system thereof of gas permeability of coal seam.
Background technology
The coal seam of poor air permeability is difficult to the coal bed gas within direct extraction when not taking anti-reflection technology, and it is also the coal seam easily causing coal and gas prominent that these hard-pumpeds put coal seam simultaneously.The method processing this high methane low permeability coal seam being widely used at present has: a, adjacent layer release exhaust technology, but, this kind of method extraction can not solve this coal-bed gas；B, Upward mining technology, this kind of method needs the gas geological conditions possessing Upward mining, and the scope of application is limited；C, hydraulic turbulence or high-pressure pulsating water filling, these method techniques, equipment complex effects are undesirable；D, deep hole blasting presplitting technology, carbon dioxide flooding drainage technique etc., these method Technologies are complicated, have certain danger etc..
Said method or the scope of use are limited, thus spread is not easily, or high cost, technical matters is complicated, operation inconvenience.Therefore, a kind of new method increasing gas permeability of coal seam of research it is badly in need of.
Summary of the invention
Present invention aim to address that the use scope that the method for existing increase gas permeability of coal seam exists is little, the complicated and unhandy technical problem of high cost, technical matters, it is provided that a kind of based on injecting water vapour to increase method and the system thereof of gas permeability of coal seam.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of based on injecting the water vapour method to increase gas permeability of coal seam, it comprises the following steps:
1) water pump is utilized to be pumped in steam generator by water；
2) described steam generator produces water at atmospheric pressure steam, superheated vapour or boiling water；
3) pipeline, hole packer and coal bed drilling that water at atmospheric pressure steam, superheated vapour or the boiling water that steam generator produces passes through to be set in advance in target coal seam inject in coal seam.
A kind of realize above-mentioned based on inject water vapour to increase the system of the method for gas permeability of coal seam, it includes water tank, water pump, steam generator, hole packer and pipeline, the water inlet of water pump is connected with water tank, the outlet of water pump is connected with the water inlet of steam generator by water pipe, the venthole of steam generator is connected with one end of pipeline, and the other end of pipeline is connected with coal bed drilling by being arranged at the hole packer of coal bed drilling port.
The described steam generator of the another technical scheme of the present invention can also be arranged in the port of described coal bed drilling, to reduce the loss of heat energy.
The technique scheme of the present invention is based on deposits recognizing incomplete same with current adsorption theory and proposing of gas to the tax that the low property of high methane is projecting coal bed.High methane low permeability coal seam gas is that except adsorption gas, some exists with the form of methane with the crystalline solid of water except part, these crystalline solid are that uneven dispersed is distributed in the porous dehiscence gap in coal seam, the existence of these crystalline solid just makes coal-bed gas not easily flow just, thus producing gas accumulation district, and then cause coal and gas prominent under suitable condition, the existence of this crystalline solid is an essential condition of coal and gas prominent, explain why Gas Outburst time outburst area temperature reduce and the many gas amount bigger than surveyed coal seam gas-bearing capacity of gushing out at short notice.The scheme that the present invention proposes is by injecting target coal seam by water at atmospheric pressure steam, superheated vapour or boiling water, improve coal seam temperature on the one hand, add the kinetic energy of methane molecule, be conducive to gasresolution, destroy the structure of methane and water crystallization body on the other hand, not only significantly speed up the parsing of gas, dredged the passage of methane flowing simultaneously, added the breathability in coal seam.
The present invention is compared with background technology, there is the feature of the breathability that efficiently can increase coal seam easily, coal bed gas is extracted in a large number thus being beneficial to, obtain the clean energy resource of high efficiency low cost, reduce mine gas emission rate, the condition of coal and gas prominent can be eliminated, it is ensured that the advantages such as the Environmental security of extraction coal bed gas simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of present system；
Fig. 2 is the structural representation of the another kind of embodiment of present system.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
In the present embodiment a kind of based on inject the water vapour method to increase gas permeability of coal seam, it comprises the following steps:
1) water pump is utilized to be pumped in steam generator by water；
2) described steam generator produces water at atmospheric pressure steam；
3) pipeline, hole packer and the coal bed drilling that the water at atmospheric pressure steam that steam generator produces passes through to be set in advance in target coal seam injects in coal seam.
As shown in Figure 1, a kind of realize above-mentioned based on inject water vapour to increase the system of the method for gas permeability of coal seam, it includes water tank 1, water pump 2, steam generator 3, hole packer 4 and pipeline 5, the water inlet of water pump 2 is connected with water tank 1 by water pipe 8, the outlet of water pump 2 is connected with the water inlet of steam generator 3 by water pipe 8, the water pipe 8 of water pump 2 outlet is provided with Pressure gauge 6, the venthole of steam generator 3 is connected with one end of pipeline 5, the other end of pipeline 5 is connected with coal bed drilling 9 by being arranged at the hole packer 4 of coal bed drilling 9 port, pipeline 5 is provided with Pressure gauge 7.
Embodiment 2
In the present embodiment a kind of based on inject the water vapour method to increase gas permeability of coal seam, it comprises the following steps:
1) water pump is utilized to be pumped in steam generator by water；
2) described steam generator produces boiling water；
3) pipeline, hole packer and the coal bed drilling that the boiling water that steam generator produces passes through to be set in advance in target coal seam injects in coal seam.
Realizing in the present embodiment is above-mentioned identical with embodiment 1 with the system increasing the method for gas permeability of coal seam based on injecting water vapour.
Embodiment 3
In the present embodiment a kind of based on inject the water vapour method to increase gas permeability of coal seam, it comprises the following steps:
1) water pump is utilized to be pumped in steam generator by water；
2) described steam generator produces superheated vapour；
3) pipeline, hole packer and the coal bed drilling that the superheated vapour that steam generator produces passes through to be set in advance in target coal seam injects in coal seam.
Realizing in the present embodiment is above-mentioned identical with embodiment 1 with the system increasing the method for gas permeability of coal seam based on injecting water vapour.
As shown in Figure 2, a kind of described in above-described embodiment realizes above-mentioned based on injecting water vapour to increase the system of the method for gas permeability of coal seam, it can also be following structure, it includes water tank 1, water pump 2, steam generator 3, hole packer 4 and pipeline 5, the water inlet of water pump 2 is connected with water tank 1 by water pipe 8, the water pipe 8 of water pump 2 outlet is provided with Pressure gauge 6, the outlet of water pump 2 is connected with the water inlet of steam generator 3 by water pipe 8, steam generator 3 is arranged on the port of described coal bed drilling 9, the venthole of steam generator 3 is connected with one end of pipeline 5, the other end of pipeline 5 is connected with coal bed drilling 9 by the hole packer 4 being arranged in coal bed drilling 9, to reduce the loss of heat energy.
The angle of coal bed drilling described in above-described embodiment is the unspecified angle between 0-90 degree.
In above-described embodiment, the quantity of hole packer 4 can according to the angle-determining of concrete coal bed texture and coal bed drilling 9.
Through the Gas-bearing Coal Seams that the present invention processes, breathability obtains increase at double, under same extraction technological parameter, the present invention draws out methane concentration than existing technique and pumping volume improves 5～10 times, this coal bed gas drainage rate reaches more than 45%, substantially eliminating the probability of coal and gas prominent, improves the level of security of mine, obtain abundant coal bed gas resource simultaneously, reduce the greenhouse effect of air.
Claims (3)
1. one kind based on inject the water vapour method to increase gas permeability of coal seam, it is characterised in that comprise the following steps:
1) water pump is utilized to be pumped in steam generator by water；
2) described steam generator produces water at atmospheric pressure steam, superheated vapour or boiling water；
3) pipeline, hole packer and coal bed drilling that water at atmospheric pressure steam, superheated vapour or the boiling water that steam generator produces passes through to be set in advance in target coal seam inject in coal seam.
2. one kind realizes described in claim 1 based on injecting water vapour to increase the system of the method for gas permeability of coal seam, it is characterized in that, it includes water tank, water pump, steam generator, hole packer and pipeline, the water inlet of water pump is connected with water tank, the outlet of water pump is connected with the water inlet of steam generator by water pipe, the venthole of steam generator is connected with one end of pipeline, and the other end of pipeline is connected with coal bed drilling by being arranged at the hole packer of coal bed drilling port.
3. system according to claim 2, it is characterised in that described steam generator can also be arranged in the port of described coal bed drilling, to reduce the loss of heat energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272645.XA CN105735958A (en) | 2016-04-27 | 2016-04-27 | Method and system for increasing coal bed gas permeability based on water vapor injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272645.XA CN105735958A (en) | 2016-04-27 | 2016-04-27 | Method and system for increasing coal bed gas permeability based on water vapor injection |
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| CN105735958A true CN105735958A (en) | 2016-07-06 |
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| CN201610272645.XA Pending CN105735958A (en) | 2016-04-27 | 2016-04-27 | Method and system for increasing coal bed gas permeability based on water vapor injection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014363A (en) * | 2016-05-18 | 2016-10-12 | 中国矿业大学 | Method for improving underground coal mine gas extraction efficiency |
| CN107701157A (en) * | 2017-09-30 | 2018-02-16 | 太原理工大学 | A kind of device and method of underground heat injection transformation coal seam physical characteristic |
| CN109594983A (en) * | 2019-01-29 | 2019-04-09 | 山西省地质矿产研究院(山西省煤层气测试技术研究院) | Coal bed gas injection pressure drop well testing top-up injection and Original strata stress test monitoring system |
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| CN1508387A (en) * | 2002-12-13 | 2004-06-30 | 石油大学(北京) | Thermal recovery method for coal seam gas |
| US20050211438A1 (en) * | 2004-03-29 | 2005-09-29 | Stromquist Marty L | Methods of stimulating water sensitive coal bed methane seams |
| CN101832149A (en) * | 2010-05-20 | 2010-09-15 | 太原理工大学 | Method for extracting coal seam gas by underground heat injection |
| CN203335050U (en) * | 2013-06-25 | 2013-12-11 | 中国石油大学(华东) | Steam generating device for seabed natural gas hydrate exploitation |
| CN104481575A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Hot steam displacement gas method for improving gas extraction efficiency |
| CN104696003A (en) * | 2015-01-06 | 2015-06-10 | 中国矿业大学 | Coal seam gas extraction method capable of realizing drilling and cutting integration and oscillation and heat injection cooperative reinforcement |
-
2016
- 2016-04-27 CN CN201610272645.XA patent/CN105735958A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1508387A (en) * | 2002-12-13 | 2004-06-30 | 石油大学(北京) | Thermal recovery method for coal seam gas |
| US20050211438A1 (en) * | 2004-03-29 | 2005-09-29 | Stromquist Marty L | Methods of stimulating water sensitive coal bed methane seams |
| CN101832149A (en) * | 2010-05-20 | 2010-09-15 | 太原理工大学 | Method for extracting coal seam gas by underground heat injection |
| CN203335050U (en) * | 2013-06-25 | 2013-12-11 | 中国石油大学(华东) | Steam generating device for seabed natural gas hydrate exploitation |
| CN104481575A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Hot steam displacement gas method for improving gas extraction efficiency |
| CN104696003A (en) * | 2015-01-06 | 2015-06-10 | 中国矿业大学 | Coal seam gas extraction method capable of realizing drilling and cutting integration and oscillation and heat injection cooperative reinforcement |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014363A (en) * | 2016-05-18 | 2016-10-12 | 中国矿业大学 | Method for improving underground coal mine gas extraction efficiency |
| CN106014363B (en) * | 2016-05-18 | 2018-06-15 | 中国矿业大学 | A kind of method for improving coal mine gas extraction efficiency |
| CN107701157A (en) * | 2017-09-30 | 2018-02-16 | 太原理工大学 | A kind of device and method of underground heat injection transformation coal seam physical characteristic |
| CN109594983A (en) * | 2019-01-29 | 2019-04-09 | 山西省地质矿产研究院(山西省煤层气测试技术研究院) | Coal bed gas injection pressure drop well testing top-up injection and Original strata stress test monitoring system |
| CN109594983B (en) * | 2019-01-29 | 2022-04-22 | 山西省地质矿产研究院(山西省煤层气测试技术研究院) | Constant-current injection and in-situ stress test monitoring system for coal bed gas injection pressure drop well testing |
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Application publication date: 20160706 |