CN106837330A - A kind of supercritical CO2Improve the device of coal seam permeability - Google Patents
A kind of supercritical CO2Improve the device of coal seam permeability Download PDFInfo
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- CN106837330A CN106837330A CN201710173601.6A CN201710173601A CN106837330A CN 106837330 A CN106837330 A CN 106837330A CN 201710173601 A CN201710173601 A CN 201710173601A CN 106837330 A CN106837330 A CN 106837330A
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- 239000003245 coal Substances 0.000 title claims abstract description 49
- 230000035699 permeability Effects 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000006641 stabilisation Effects 0.000 abstract description 6
- 238000011105 stabilization Methods 0.000 abstract description 6
- 239000008236 heating water Substances 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 206010037544 Purging Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a kind of supercritical CO2The device of coal seam permeability is improved, belongs to the device for improving coal bed gas recovery ratio.The device provides source of the gas from gas injection system and autoclave pressure to three axle seepage apparatus, by loading system for three axle seepage apparatus provide axle pressure, confined pressure, temperature needed for experiment is provided using water bath.Device includes：Gas injection system, supercharging device, autoclave pressure, temperature control system, three axle seepage apparatus, loading system, gas gathering system, pumped vacuum systems, data collecting system.Gas injection system of the present invention can ensure bleed pressure stabilization, liquid CO2It is passed through again in autoclave pressure by heating water bath by supercharging device supercharging, reaches supercriticality；By heating water bath, temperature control system can ensure autoclave pressure and three axle seepage apparatus temperature stabilizations, and check device air-tightness；The pressure of three axle seepage apparatus outlet sides is atmospheric pressure, and increasing collector can ensure that fluid steadily flows out.
Description
Technical field
Increase the present invention relates to coal bed gas and adopt technical field category, more particularly to a kind of supercritical CO2Improve coal seam permeability
Device.
Background technology
China's coal bed gas resource enriches, and Occurrence of Coalbed Methane complicated condition, high gas layer and projecting mine coal seam are commonly
Low permeability coal seam.At present, mainly carried using methods such as hole pumping and mining, hydrofracturing extraction, hydraulic slotted liner technique extraction and water filling purgings
The recovery ratio of coal bed gas high, but effect is undesirable.And as seam mining depth increases, crustal stress, coal bed gas pore pressure
Increase with ground temperature, gas permeability of coal seam reduction also results in coal bed gas recovery ratio relatively low.Using CO2Reinforcing storage coal bed gas back production side
Method (ECBM) can significantly improve recovery ratio, but reduce coal seam permeability, and easily induce coal and CO2Prominent accident.
When coal seam buried depth is more than 800m, the Virgin rock temperature and pressure in coal seam make CO2Supercriticality is reached, it is overcritical
CO2Viscosity and gaseous state CO2It is close, density and liquid CO2It is close, the features such as with zero surface tension, high diffusivity coefficient.Note in coal seam
Enter supercritical CO2Can be with effective displacement coal seam CH4, improve coal bed gas recovery ratio, can also improve coal bed texture, improve coal seam ooze
Permeability.In order to study supercritical CO in detail2Coal seam permeability rule is improved, it is necessary to be reformed to original experimental rig.
The content of the invention
A kind of supercritical CO of the present invention2The purpose for improving the device of coal seam permeability is to change existing experimental rig pressure
Power is unstable, achieves effective control fluid phase state and test temperature.To change the low present situation of coal bed gas recovery ratio, improving coal bed gas
A kind of recovery ratio, there is provided device that can effectively change coal bed texture, improve coal seam permeability.
To achieve the above object, the technical scheme is that：
A kind of supercritical CO2The device of coal seam permeability is improved, including：Gas injection system 21, supercharging device 22, autoclave pressure 7,
Temperature control system 23, three axle seepage apparatus 9, loading system 24, gas gathering system 25, pumped vacuum systems 26 and data collecting system
27；The gas injection system 21 is by N21 and liquid CO of bottle2Bottle 2 is constituted, the N2Bottle 1 passes through six-way valve 6 and one end phase of autoclave pressure 7
Even, the liquid CO2Bottle 2 is connected by supercharging device 22 with autoclave pressure 7, and the other end of autoclave pressure 7 passes through the axle seepage flow of valve 8 and three
The injection end of device 9 connect, the outlet side of three axle seepage apparatus 9 by six-way valve 15 respectively with loading system 24, gas gathering system 25 and
Pumped vacuum systems 26 is connected；The axle seepage apparatus 9 of the autoclave pressure 7 and three are respectively positioned in temperature control system 23；Data acquisition system
System 27 is connected with six-way valve 6 or six-way valve 15.
Wherein, in described gas injection system 21, liquid CO2Autoclave pressure 7 is directly injected into after being boosted through supercharging device 22, is passed through
The water bath with thermostatic control of temperature control system 23 is heated, and reaches supercriticality.
Wherein, described supercharging device 22 is made up of booster pump 3 and air compressor 4.
Wherein, described temperature control system 23 includes water bath 5.
Wherein, described loading system 24 is made up of hand-operating pressure pump 11 and voltage-stablizer 10.
Wherein, described pumped vacuum systems 26 includes vavuum pump 14.
Wherein, described gas gathering system 25 is made up of collector 12 and flowmeter 13.
Wherein, described data collecting system 27 includes data collecting instrument 16,17.
A kind of supercritical CO of the present invention2Improve the effective benefit of the device of coal seam permeability：
On the basis of the axle seepage apparatus of laboratory three, the present invention is additionally arranged gas injection system, autoclave pressure, temperature control system,
And water bath with thermostatic control is heated during autoclave pressure and three axle seepage apparatus are placed on into water bath；Gas injection system can ensure bleed pressure
Stabilization, liquid CO2It is passed through again in autoclave pressure by heating water bath by supercharging device supercharging, reaches supercriticality；By water
Bath heating, temperature control system can ensure autoclave pressure and three axle seepage apparatus temperature stabilizations, and check device air-tightness；Three axles
The pressure of seepage apparatus outlet side is atmospheric pressure, and increasing collector can ensure that fluid steadily flows out.
Brief description of the drawings
Fig. 1 is a kind of supercritical CO of the invention2Improve the system schematic of the device of coal seam permeability；
In Fig. 1,1-N2Bottle；2- liquid CO2Bottle；3- booster pumps；4- air compressors；5- water baths；6- six-way valves；7- is pressed
Power kettle；8- valves；The axle seepage apparatus of 9- tri-；10- voltage-stablizers；11- hand-operating pressure pumps；12- collectors；13- flowmeters；14-
Vavuum pump；15- six-way valves；16th, 17- data collecting instruments；21- gas injection systems；22- supercharging devices；23- temperature control systems；24-
Loading system；25- gas gathering systems；26- pumped vacuum systems；27- data collecting systems.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is a kind of supercritical CO of the invention2The system schematic of the device of coal seam permeability is improved, as seen from Figure 1, this
Invent a kind of supercritical CO2The device for improving coal seam permeability includes：Gas injection system 21, supercharging device 22, autoclave pressure 7, temperature
Control system 23, three axle seepage apparatus 9, loading system 24, gas gathering system 25, pumped vacuum systems 26 and data collecting system 27；
The gas injection system 21 is by N21 and liquid CO of bottle2Bottle 2 is constituted, the N2Bottle 1 is connected by six-way valve 6 with the one end of autoclave pressure 7, institute
State liquid CO2Bottle 2 is connected by supercharging device 22 with autoclave pressure 7, and the other end of autoclave pressure 7 passes through the axle seepage apparatus 9 of valve 8 and three
Injection end is connected, the outlet side of three axle seepage apparatus 9 by six-way valve 15 respectively with loading system 24, gas gathering system 25 and vacuumize
System 26 is connected；The axle seepage apparatus 9 of the autoclave pressure 7 and three are respectively positioned in temperature control system 23；Data collecting system 27 with
Six-way valve 6 or six-way valve 15 are connected.
In described gas injection system 21, liquid CO2Autoclave pressure 7 is directly injected into after being boosted through supercharging device 22, through excess temperature
The water bath with thermostatic control of control system 23 is heated, and reaches supercriticality.
Described supercharging device 22 is made up of booster pump 3 and air compressor 4.
Described temperature control system 23 includes water bath 5.The temperature adjustable extent of the water bath 5 is 20 DEG C -60 DEG C,
Temperature is 30 DEG C -60 DEG C when actually used, and water bath 5 ensure that the stabilization of autoclave pressure and three axle seepage apparatus temperature, using water
Bath heating and temperature control system can be with check device air-tightness.
Described loading system 24 is that three axle seepage apparatus 9 provide axle pressure and confined pressure, and loading system 24 is by hand-operating pressure pump
11 and voltage-stablizer 10 constitute, axle pressure, confined pressure are applied to test specimen using hand-operating pressure pump 11, pressure range is 0-15MPa.
Described pumped vacuum systems 26 includes vavuum pump 14.
Described gas gathering system 25 is made up of collector 12 and flowmeter 13.
Described data collecting system 27 includes data collecting instrument 16,17, can precisely record the hole of experiment overall process
Pressure, axle pressure and confined pressure.
A kind of supercritical CO of the present invention2The operating method for improving the device of coal seam permeability is as follows：
(1) coal test specimen is prepared.Drill through coal test specimen along coal seam Ceng Li directions using Rock and coal cutting machine, size be φ 50 ×
100mm。
(2) coal test specimen is put into device.
(3) check device air-tightness.Adjust external temperature controller to be heated to water bath 5 to test 55 DEG C of maximum temperature, utilize
Hand-operating pressure pump 11 alternately applies axle pressure and confined pressure extremely tests maximum 12MPa；Using supercharging device to CO2It is pressurized to experiment most
High pressure 14MPa, in injection autoclave pressure 7, CO2Reach supercriticality；Checkout facility system after stablizing 1 hour, if data are adopted
Pressure is unchanged in collecting system shows that pilot system air-tightness is good.
(4) pumped vacuum systems is opened, system is vacuumized.
(5) valve 8, six-way valve 15 are closed, six-way valve 6 is opened.Prefiring system, opens supercharging device, control supercharging
Pump 3 is to liquid CO2Pressurization is passed through in autoclave pressure 7 again, by heating water bath, CO2Reach supercriticality.
(6) supercritical CO is worked as2Pressure value closes six-way valve 6 to predetermined value, opens valve 8, fully absorption 24 hours.It is logical
Cross initial pressure and pressure value during adsorption saturation in data collecting system record autoclave pressure 7.
(7) valve 8 is closed, six-way valve 15 is opened, free gas is discharged.
(8) loading system is opened, axle pressure and confined pressure is alternately applied to predetermined value to coal sample using hand-operating pressure pump 11, opened
Six-way valve 6, is passed through certain pressure N2, N2Pressure is less than confined pressure, after after gas flow rate stabilization, opens collector 12, recycles stream
Gauge 13 measures flow, and measurement is averaged for three times.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of supercritical CO2Improve the device of coal seam permeability, it is characterised in that including：Gas injection system (21), supercharging device
(22), autoclave pressure (7), temperature control system (23), three axle seepage apparatus (9), loading system (24), gas gathering system (25), take out
Vacuum system (26) and data collecting system (27)；The gas injection system (21) is by N2Bottle (1) and liquid CO2Bottle (2) composition, institute
State N2Bottle (1) is connected by six-way valve (6) with autoclave pressure (7) one end, the liquid CO2Bottle (2) is by supercharging device (22) and pressure
Power kettle (7) is connected, and autoclave pressure (7) other end is connected by valve (8) with three axle seepage apparatus (9) injection ends, three axle seepage flow dress
(9) outlet side is put to be connected with loading system (24) gas gathering system (25) and pumped vacuum systems (26) respectively by six-way valve (15)；
The autoclave pressure (7) is respectively positioned in temperature control system (23) with three axle seepage apparatus (9)；Data collecting system (27) is led to six
Valve (6) or six-way valve (15) are connected.
2. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described note
In gas system (21), liquid CO2Autoclave pressure (7) is directly injected into after being boosted through supercharging device (22), by temperature control system
(23) water bath with thermostatic control heating, reaches supercriticality.
3. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described increasing
Pressure device (22) is made up of booster pump (3) and air compressor (4).
4. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described temperature
Degree control system (23) includes water bath (5).
5. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described adds
Loading system (24) is made up of hand-operating pressure pump (11) and voltage-stablizer (10).
6. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described takes out
Vacuum system (26) includes vavuum pump (14).
7. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described collection
Gas system (25) is made up of collector (12) and flowmeter (13).
8. a kind of supercritical CO according to claim 12Improve the device of coal seam permeability, it is characterised in that described number
Include data collecting instrument (16), (17) according to acquisition system (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710173601.6A CN106837330A (en) | 2017-03-22 | 2017-03-22 | A kind of supercritical CO2Improve the device of coal seam permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710173601.6A CN106837330A (en) | 2017-03-22 | 2017-03-22 | A kind of supercritical CO2Improve the device of coal seam permeability |
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| Publication Number | Publication Date |
|---|---|
| CN106837330A true CN106837330A (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710173601.6A Pending CN106837330A (en) | 2017-03-22 | 2017-03-22 | A kind of supercritical CO2Improve the device of coal seam permeability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037016A (en) * | 2017-12-28 | 2018-05-15 | 太原理工大学 | Supercritical CO 2 reaction kettle and rock mass creep diffusion erosion test system |
| CN109342287A (en) * | 2018-10-25 | 2019-02-15 | 中国石油天然气股份有限公司 | Method for judging gas-water steady-state seepage |
| CN113092271A (en) * | 2021-04-02 | 2021-07-09 | 中国矿业大学 | Supercritical fluid generation device, coal rock mechanical test system and test method |
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2017
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037016A (en) * | 2017-12-28 | 2018-05-15 | 太原理工大学 | Supercritical CO 2 reaction kettle and rock mass creep diffusion erosion test system |
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| CN109342287A (en) * | 2018-10-25 | 2019-02-15 | 中国石油天然气股份有限公司 | Method for judging gas-water steady-state seepage |
| CN113092271A (en) * | 2021-04-02 | 2021-07-09 | 中国矿业大学 | Supercritical fluid generation device, coal rock mechanical test system and test method |
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Application publication date: 20170613 |