CN106121604B - It is a kind of to utilize CO2Drive away the method for coal-bed gas and residual gas with modified water - Google Patents
It is a kind of to utilize CO2Drive away the method for coal-bed gas and residual gas with modified water Download PDFInfo
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- CN106121604B CN106121604B CN201610485877.3A CN201610485877A CN106121604B CN 106121604 B CN106121604 B CN 106121604B CN 201610485877 A CN201610485877 A CN 201610485877A CN 106121604 B CN106121604 B CN 106121604B
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- seam
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000000605 extraction Methods 0.000 claims abstract description 66
- 239000003245 coal Substances 0.000 claims abstract description 47
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims description 72
- 239000007864 aqueous solution Substances 0.000 claims description 18
- 230000037452 priming Effects 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000003325 tomography Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 9
- 239000001569 carbon dioxide Substances 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 74
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000001629 suppression Effects 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
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B43/20—Displacing by water
Landscapes
- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
CO is utilized the invention discloses a kind of2The method for driving away coal-bed gas and residual gas with modified water, the expeling that gas and residual gas are carried out using three phases are respectively：Conventional gas pumping stage, gas phase displacement stage and waterpower displacement stage；Gas pumping is first carried out, gas phase displacement stage, final waterpower displacement stage are then carried out；Such mode can effectively improve the extraction efficiency of coal-bed gas, the range of coal-bed gas displacement is expanded using carbon dioxide gas, the permeability for improving coal seam is that waterpower displacement is provided convenience condition, carbon dioxide gas extra in coal seam is not only absorbed by injecting modified water into coal seam, it can go deep into inside coal body again, improve coal seam moisture content.
Description
Technical field
It is specifically a kind of to utilize CO the present invention relates to a kind of method of expeling coal-bed gas and residual gas2And modified water
Drive away the method for coal-bed gas and residual gas.
Background technology
Coal-bed gas gas is the main hazard source in seam mining at present, and the aggregation of a large amount of methane gas be easy to cause coal
With gas burst accident, while in the mining process of coal seam, in coal seam the effusion of methane gas be also downhole production it is dangerous because
Element, therefore coal bed gas extraction is the effective means for preventing coal-bed gas disaster.
To promote the efficient extraction of coal-bed gas, a large amount of technical staff propose displacement coal-bed gas, to improve extraction
Efficiency, it is existing it is the most widely used be waterpower displacement and inert gas displacement.The two respectively has advantage and disadvantage, and waterpower displacement can not only
Methane gas in enough displacement coal seams, while coal seam moisture increase has been improved the intensity in coal seam while can also play the work of dust suppression
With, but compared to gas, infiltration capacity of the moisture in coal seam is weaker, thus the effective range of waterpower displacement is unsatisfactory,
The spacing of wells is smaller great in constructing amount in.Inert gas（CO2）When driving away coal-bed gas gas, effect is preferable, and influences model
It encloses larger.But inert gas remains in coal seam again during gas is driven away, the especially stronger CO of adsorption capacity2, should
Gas adsorption capacity in coal seam causes unpredictable secondary hidden danger far more than gas.How efficiently to drive away in coal seam watt
This gas, but do not generate secondary hidden danger become prevention and control of mine disaster primary study work.It can be seen that can efficient displacement
Coal-bed gas can provide effective technical support to avoid the scientific method of secondary hidden danger for coal-bed gas preventing and controlling again.
Invention content
CO is utilized in view of the above existing problems in the prior art, the present invention provides a kind of2Drive away coal-bed gas with modified water
And the method for residual gas, the range of coal-bed gas displacement is not only expanded, the permeability in coal seam is improved and is provided for waterpower displacement
Convenience；It is can absorb residual gas also by waterpower displacement, avoids the generation of secondary hidden danger.
To achieve the goals above, the technical solution adopted by the present invention is：This kind utilizes CO2Drive away coal seam watt with modified water
The method of this and residual gas, the specific steps are：
A, the region that selection is discharged without tomography and no swell in coal seam, measures gas reset pressure value in the regional coal-seam,
At least three drillings are set into regional coal-seam, 10m~15m is separated by between each drilling, each drilling are connected take out after the completion
Extraction system carries out gas pumping；
B, the gas concentration that extraction goes out is monitored and recorded during gas pumping, when the average mash gas extraction of each drilling
When concentration is reduced to the 50% of initial mash gas extraction concentration, each drilling is spaced and stops gas pumping, the drilling of extraction will be stopped
With note CO2Device connects, remaining drilling is normally carried out gas pumping；
C, note CO is opened2Device injects CO into the drilling for stopping extraction2Gas, gas injection pressure are at least the coal seam watt
2 times of this reset pressure value, remaining drilling are normally carried out extraction work；
D, it monitors and records the mixed gas concentration value extracted out in each extraction borehole, when in the mixed gas that extraction goes out
CO2Gas concentration and CH4Gas concentration ratio is increased to 4:When 1, note CO is closed2Device, remaining drilling are normally carried out extraction work
Make；
E, note CO is removed2Device will note CO2Drilling connect with extraction system after start extraction work, it is each drilling continue
Extraction is until CO2Gas and CH4When gas mixture concentration is down to extraction and goes out 5% or less gas, note CO is disconnected2Drilling and extraction system
Priming device is connect by the connection of system with the drilling of above-mentioned disconnection, and the aqueous solution of the priming device injection is that alkalinity mixing is molten
Liquid；
F, it is 2MPa to 4MPa that priming device, which uses low pressure slow injection mode aqueous solution into drilling, aqueous solution pressure,
Aqueous solution amount is the 4% of the region coal body quality, and the described region coal body quality is according to coal seam thickness and the regional coal-seam model
It encloses and show that the region coal body volume is multiplied by coal body density, remaining drilling persistently carries out extraction work；
G, when liquid exudation occurs in the drilling of lasting extraction, stop priming device work, disconnect aqueous solution drilling with
Aqueous solution drilling is connected into extraction system by the connection of priming device, proceeds by extraction, and all drillings continue extraction until opening
Extraction system is removed when the beginning digging regional coal-seam.
Further, the alkaline mixed solution is the NaOH aqueous solutions of saturation.
Further, it is separated by 10m between each drilling.
Compared with prior art, the present invention carries out the expeling of gas and residual gas using three phases：Conventional gas is taken out
It adopts the stage, gas phase displacement stage and waterpower displacement stage；Gas pumping is first carried out, gas phase displacement stage, final water are then carried out
The power displacement stage；Such mode can effectively improve the extraction efficiency of coal-bed gas, and coal is expanded using carbon dioxide gas
The range of layer gas displacement, the permeability for improving coal seam is that waterpower displacement is provided convenience condition, by being injected into coal seam
Modified water not only absorbs carbon dioxide gas extra in coal seam, and can go deep into inside coal body, improves coal seam moisture content.
Description of the drawings
Fig. 1 is the construction location schematic diagram of the present invention.
In figure：1, coal seam, 2, rock stratum.
Specific implementation mode
The invention will be further described below.
Embodiment：As shown in Figure 1, the present invention the specific steps are：
A, the region that selection is discharged without tomography and no swell in coal seam, measures gas reset pressure value in the regional coal-seam,
Three drillings are set into coal seam, respectively A drillings, B drillings and C drillings are separated by 10m~15m, after the completion between three drillings
Gas pumping is carried out to three drilling connection extraction systems；
B, the gas concentration that extraction goes out is monitored and recorded during gas pumping, when the average mash gas extraction of each drilling
When concentration is reduced to the 50% of initial mash gas extraction concentration, to A drilling and C drilling stop gas pumping, by A drilling and C drilling and
Note CO2Device connects, and B drillings are normally carried out gas pumping；
C, note CO is opened2Device injects CO into A drillings and C drillings2Gas, gas injection pressure are at least the coal-bed gas
2 times of reset pressure value, B drillings are normally carried out extraction work；
D, it monitors and records the mixed gas concentration value extracted out in each extraction borehole, when in the mixed gas that extraction goes out
CO2Gas concentration and CH4Gas concentration ratio is increased to 4:When 1, note CO is closed2Device, B drillings are normally carried out extraction work；
E, note CO is removed2Device starts extraction work after connecting A drillings and C drillings with extraction system, and three drillings are held
Continuous extraction is until CO2Gas and CH4When gas mixture concentration is down to extraction and goes out 5% or less gas, disconnect A drillings and C drillings and
Priming device and A are drilled and C drillings connect by the connection of extraction system, and the aqueous solution of the priming device injection is that alkalinity is mixed
Close solution；
F, using low pressure slow injection mode, aqueous solution, aqueous solution pressure into A drillings and C drillings are 2MPa to priming device
To 4MPa, aqueous solution amount is the 4% of the region coal body quality, and the described region coal body quality is according to coal seam thickness and the area
Domain coal seam range show that the region coal body volume is multiplied by coal body density, and B drillings persistently carry out extraction work；
G, when liquid exudation occurs in the lasting extraction of B drillings, stop priming device work, disconnection A drills and C drills and note
A drillings and C drillings are connected into extraction system by the connection of liquid device, proceed by extraction, and three drillings continue extraction until starting
Extraction system is removed when the digging regional coal-seam.
Further, the alkaline mixed solution is the NaOH aqueous solutions of saturation.
Further, it is separated by 10m between three drilling.
Claims (3)
1. a kind of utilizing CO2Drive away the method for coal-bed gas and residual gas with modified water, which is characterized in that the specific steps are：
A, the region that selection is discharged without tomography and no swell in coal seam, measures gas reset pressure value in the regional coal-seam, to area
At least three drillings are set in the coal seam of domain, 10m~15m is separated by between each drilling, after the completion to each drilling connection extraction system
System carries out gas pumping；
B, the gas concentration that extraction goes out is monitored and recorded during gas pumping, when the average mash gas extraction concentration of each drilling
When being reduced to the 50% of initial mash gas extraction concentration, each drilling is spaced and stops gas pumping, drilling and the note of extraction will be stopped
CO2Device connects, remaining drilling is normally carried out gas pumping；
C, note CO is opened2Device injects CO into the drilling for stopping extraction2Gas, gas injection pressure are at least coal-bed gas original
2 times of beginning pressure value, remaining drilling are normally carried out extraction work；
D, the mixed gas concentration value extracted out in each extraction borehole is monitored and records, as CO in the mixed gas that extraction goes out2Gas
Concentration and CH4Gas concentration ratio is increased to 4:When 1, note CO is closed2Device, remaining drilling are normally carried out extraction work；
E, note CO is removed2Device will note CO2Drilling connect with extraction system after start extraction work, it is each drilling continue extraction
Until CO2Gas and CH4When gas mixture concentration is down to extraction and goes out 5% or less gas, note CO is disconnected2Drilling and extraction system
Connection, priming device is connect with the drilling of above-mentioned disconnection, and the aqueous solution of the priming device injection is alkaline mixed solution；
F, it is 2MPa to 4MPa, water filling that priming device, which uses low pressure slow injection mode aqueous solution into drilling, aqueous solution pressure,
Amount of solution is the 4% of the region coal body quality, and the described region coal body quality is to be obtained according to coal seam thickness and the regional coal-seam range
Go out the region coal body volume and be multiplied by coal body density, remaining drilling persistently carries out extraction work；
G, when liquid exudation occurs in the drilling of lasting extraction, stop priming device work, disconnect aqueous solution drilling and fluid injection
Aqueous solution drilling is connected into extraction system by the connection of device, proceeds by extraction, and all drillings continue extraction until starting to adopt
Extraction system is removed when digging the regional coal-seam.
2. utilizing CO according to described in claim 12Drive away the method for coal-bed gas and residual gas, feature with modified water
It is, the alkaline mixed solution is the NaOH aqueous solutions of saturation.
3. utilizing CO according to described in claim 12Drive away the method for coal-bed gas and residual gas, feature with modified water
It is, is separated by 10m between each drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610485877.3A CN106121604B (en) | 2016-06-27 | 2016-06-27 | It is a kind of to utilize CO2Drive away the method for coal-bed gas and residual gas with modified water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610485877.3A CN106121604B (en) | 2016-06-27 | 2016-06-27 | It is a kind of to utilize CO2Drive away the method for coal-bed gas and residual gas with modified water |
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| Publication Number | Publication Date |
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| CN106121604A CN106121604A (en) | 2016-11-16 |
| CN106121604B true CN106121604B (en) | 2018-08-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505565B (en) * | 2018-12-18 | 2021-01-26 | 中国矿业大学 | Method for extracting coal seam gas by water injection and gas injection alternating displacement |
| CN113550784B (en) * | 2021-03-31 | 2022-05-24 | 湖南科技大学 | Method for extracting high-sulfur coal seam gas and treating hydrogen sulfide through acid-base synergy |
| CN113236344B (en) * | 2021-06-11 | 2023-10-13 | 煤炭科学技术研究院有限公司 | Device and method for preventing and controlling spontaneous combustion of coal seam by injecting nitrogen and mixing flame retardant for displacement pumping promotion |
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Family Cites Families (1)
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| WO2015076839A1 (en) * | 2013-11-25 | 2015-05-28 | Halliburton Energy Services, Inc. | Methods and systems for determining and using gas extraction correction coefficients at a well site |
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|---|---|---|---|---|
| US6035933A (en) * | 1997-10-17 | 2000-03-14 | Petroleo Brasileiro S.A.-Petrobras | Process for the thermo-hydraulic control of gas hydrates |
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