CN102778554B - Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process - Google Patents
Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process Download PDFInfo
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- CN102778554B CN102778554B CN201210276714.6A CN201210276714A CN102778554B CN 102778554 B CN102778554 B CN 102778554B CN 201210276714 A CN201210276714 A CN 201210276714A CN 102778554 B CN102778554 B CN 102778554B
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- 230000035699 permeability Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title abstract description 14
- 230000008569 process Effects 0.000 title abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000013480 data collection Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 49
- 238000002474 experimental method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
本发明公开了一种超临界CO2致裂增加页岩气储层渗透率的实验装置，包括气源供应系统、气体增压器、压力室、温度控制器以及数据自动采集系统，所述压力室内设有中心钻孔的页岩试件，所述气源供应系统通过气体增压器与压力室的进气管连通，所述气体增压器和压力室均置于温度控制器内，数据自动采集系统对页岩破裂过程应力-应变关系、压力、温度、声发射信号等进行实时采集，并对超临界CO2致裂页岩前后的渗流特性进行测定；本发明的装置能够模拟多场（地应力、温度、压力）耦合条件下超临界CO2致裂过程页岩气储层渗透率动态变化，为超临界CO2致裂增加页岩气储层渗透率机理的研究提供实验平台。
The invention discloses an experimental device for increasing the permeability of shale gas reservoirs by fracturing with supercritical CO2 , including a gas source supply system, a gas booster, a pressure chamber, a temperature controller and an automatic data acquisition system. There is a shale test piece with a central borehole in the room. The gas source supply system is connected with the inlet pipe of the pressure chamber through a gas booster. The gas booster and the pressure chamber are both placed in the temperature controller, and the data is automatically The acquisition system collects the stress-strain relationship, pressure, temperature, acoustic emission signals, etc. in the shale fracture process in real time, and measures the seepage characteristics before and after the shale is fractured by supercritical CO2 ; the device of the present invention can simulate multiple fields ( The dynamic change of shale gas reservoir permeability during supercritical CO 2 fracturing under the coupled conditions of in-situ stress, temperature and pressure provides an experimental platform for the research on the mechanism of supercritical CO 2 fracturing to increase the permeability of shale gas reservoirs.
Description
Technical field
The present invention relates to a kind of supercritical CO
2fracturing increases the experimental provision of shale gas reservoir permeability, and particularly one can be carried out differently supercritical CO under stress, different reservoir pressure and condition of different temperatures
2the experimental provision of the research of fracturing shale gas reservoir mechanism experiment and the research of fracturing process shale stress-strain-permeability variation rule.
Background technology
China's natural gas demand is growing, and inlet natural gas amount increases day by day, and externally interdependency is also increasing, serious threat Chinese energy safety.China's shale gas resource is very abundant, and Efficient Development shale gas is for alleviating China's energy supply and demand contradiction, readjusting the energy structure, ensure that energy security is significant.Due to shale gas reservoir low porosity and low permeability, exploitation shale gas must carry out reservoir fracturing and anatonosis.The U.S. that successfully exploits at present shale gas mainly adopts hydraulic fracturing technology, but a large amount of water resource of this Technology Need consumption and seriously polluted to underground water.
Research is found, is worked as CO
2temperature and pressure respectively in 31.1 DEG C and 7.38 MPa when above, CO
2to reach supercriticality and (be called for short SC-CO
2).Supercritical CO
2character between gas and liquid, the low viscosity of existing gas and easily diffusivity, also have high density and the good feature of dissolubility of liquid, have superpower flow, infiltration and transmit performance, can replace clear water as fracturing liquid.
Therefore, in conjunction with China's shale gas exploitation and national CO
2the great demand reducing discharging, applicant proposes to adopt supercritical CO
2the technical thought that replaces clear water to carry out the anatonosis of shale gas reservoir fracturing, this thinking, in increasing shale gas reservoir permeability, can also realize carbon dioxide and seal up for safekeeping for a long time in shale gas reservoir.Specific operation process is: make by changing pressure and temperature the CO trapping from industrial emission source
2in the supercriticality between gaseous state and liquid state, use it for a large amount of clear water required while replacing shale gas performance history hydrofracturing reservoir, carry out the pressure break of shale gas reservoir, improve reservoir permeability, strengthen CO
2can injection, expand CO
2in shale bed, involve scope, make CO
2fully contact with shale bed, utilize shale body to CO
2and CH
4the difference of adsorptive power is by CH
4cement out, sealing CO up for safekeeping
2time improve shale gas recovery ratio, realize CO
2seal for a long time the best combination with high-efficiency resource recycling up for safekeeping.
But at present for supercritical CO
2the research of the theory of fracturing shale and experiment aspect is all gone back seldom, particularly lacks corresponding experimental provision and simulates supercritical CO
2the Changing Pattern of fracturing process shale gas reservoir permeability, stress, strain.Existing experimental provision can only carry out the experimental study of hydrofracturing, for supercritical CO
2exist following not enough: (1) can not effectively control CO
2phase; (2) can not simulate supercritical CO under many (terrestrial stress, temperature, pressure) coupling conditions
2the dynamic change of fracturing process shale gas reservoir permeability.
Summary of the invention
In view of this, the invention provides a kind of supercritical CO
2fracturing increases the experimental provision of shale gas reservoir permeability, and this device can be simulated supercritical CO under many (terrestrial stress, temperature, pressure) coupling conditions
2the dynamic change of fracturing process shale gas reservoir permeability, and shale rupture process strain-stress relation, acoustic emission signal are carried out to Real-time Collection, be supercritical CO
2the research that fracturing increases shale gas reservoir permeability mechanism provides experiment porch.
Supercritical CO of the present invention
2fracturing increases the experimental provision of shale gas reservoir permeability, comprise source of the gas supply system, gas booster, pressure chamber, temperature controller and automatic data acquisition system, in described pressure chamber, be provided with the shale test specimen of centre-drilling hole, pressure chamber is provided with draft tube and escape pipe and draft tube and escape pipe and is communicated with the centre-drilling hole of shale test specimen, described source of the gas supply system is communicated with the draft tube of pressure chamber by gas booster, described gas booster and pressure chamber are all placed in temperature controller, described automatic data acquisition system comprises computing machine, temperature sensor, pressure transducer, acoustic emission device, flowmeter, axial strain sensor and radial strain sensor, described temperature sensor, pressure transducer and acoustic emission device gather respectively the temperature of pressure chamber, pressure and acoustic emission signal are also input in computing machine in real time, described flowmeter gathers CO
2flow signal and be input in real time in computing machine, described axial strain sensor and radial strain sensor gather the deformation signal of shale test specimen and are input in real time in computing machine.
Further, described source of the gas supply system comprises the CO being communicated with successively
2gas cylinder, filtrator and non-return valve.
Further, described gas booster is high pressure CO
2syringe pump.
Further, described temperature controller is thermostatical oil bath.
Beneficial effect of the present invention is: use device of the present invention to carry out supercritical CO
2when the experiment of fracturing shale, gas booster is by CO
2be converted into liquid state, to be injected in the shale test specimen of pressure chamber higher than the pressure of 7.38MPa, by temperature controller, pressure chamber heated, temperature is increased to the temperature that is greater than 31.4 DEG C, make liquid CO
2be transformed into supercriticality, utilize supercritical CO
2fracturing shale, automatic data acquisition system carries out Real-time Collection to shale rupture process strain-stress relation, pressure, temperature, acoustic emission signal etc. simultaneously, and to supercritical CO
2seepage characteristic before and after fracturing shale is measured; Therefore, device of the present invention can be simulated supercritical CO under many (terrestrial stress, temperature, pressure) coupling conditions
2the dynamic change of fracturing process shale gas reservoir permeability is supercritical CO
2the research that fracturing increases shale gas reservoir permeability mechanism provides experiment porch.
Brief description of the drawings
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is supercritical CO of the present invention
2fracturing increases the structural representation of the experimental provision of shale gas reservoir permeability;
Fig. 2 is shale test specimen boring schematic diagram.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is supercritical CO of the present invention
2fracturing increases the structural representation of the experimental provision of shale gas reservoir permeability, as shown in the figure, and supercritical CO of the present invention
2fracturing increases the experimental provision of shale gas reservoir permeability, comprise source of the gas supply system, gas booster 2, pressure chamber 3, temperature controller 4 and automatic data acquisition system, in described pressure chamber 3, be provided with the shale test specimen 5 of centre-drilling hole, pressure chamber 3 is provided with draft tube 6 and escape pipe 7 and draft tube 6 and escape pipe 7 and is communicated with the centre-drilling hole of shale test specimen 5, described source of the gas supply system is communicated with the draft tube 6 of pressure chamber 3 by gas booster 2, described gas booster 2 and pressure chamber 3 are all placed in temperature controller 4, described automatic data acquisition system comprises computing machine 8, temperature sensor 9, pressure transducer 10, acoustic emission device 11, flowmeter 12, axial strain sensor 13 and radial strain sensor 14, described temperature sensor 9, pressure transducer 10 and acoustic emission device 11 gather respectively the temperature of pressure chamber 3, pressure and acoustic emission signal are also input in computing machine 8 in real time, described flowmeter 12 gathers CO
2flow signal and be input in real time in computing machine 8, described axial strain sensor 13 and radial strain sensor 14 gather shale test specimen 5 deformation signal and be input in real time in computing machine 8.
In the present embodiment, described source of the gas supply system comprises the CO being communicated with successively
2gas cylinder 1, filtrator 15 and non-return valve 16.
In the present embodiment, described gas booster 2 is high pressure CO
2syringe pump.
In the present embodiment, described temperature controller 4 is thermostatical oil bath.
Use device of the present invention to carry out supercritical CO
2when the experiment of fracturing shale, first according to experimental program, shale test specimen 5 is holed, boring is carried out (as shown in Figure 2) at test specimen center, and centre-drilling hole is CO
2entrance, then gas booster 2 is by CO
2be converted into liquid state, to be injected in the shale test specimen 5 of pressure chamber 3 higher than the pressure of 7.38MPa, by temperature controller 4, pressure chamber 3 heated, temperature is increased to the temperature that is greater than 31.4 DEG C, make liquid CO
2be transformed into supercriticality, utilize supercritical CO
2fracturing shale; Meanwhile, automatic data acquisition system carries out Real-time Collection to shale rupture process strain-stress relation, pressure, temperature, acoustic emission signal etc., and to supercritical CO
2seepage characteristic before and after fracturing shale is measured, and is measuring supercritical CO
2when seepage characteristic in shale, in order to keep CO
2phase, the escape pipe 7 of pressure chamber 3 must be closed, and can not be communicated with atmospheric pressure, and need to be kept above supercritical CO
2the pressure of state, need to adopt Transient Method to carry out the mensuration of permeability, and concrete operations mode is that adopts pressure sensor records test specimen two ends pressure reduction relation over time, obtains by calculating, and the Seepage Experiment of other gases can record by steady state method; The working fluid pressure scope of apparatus of the present invention is 0-15MPa, axial compression range of control is 0-100MPa, and confined pressure range of control is 0-15MPa, and maximum fluid pressure control range is 0-15MPa, temperature controlling range is 0-100 DEG C, and shale sample dimensions size is φ 100mm × 200mm.
Device of the present invention can be simulated supercritical CO under many (terrestrial stress, temperature, pressure) coupling conditions
2the dynamic change of fracturing process shale gas reservoir permeability is supercritical CO
2the research that fracturing increases shale gas reservoir permeability mechanism provides experiment porch.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although by with reference to the preferred embodiments of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, can make various changes to it in the form and details, and not depart from the spirit and scope of the present invention that appended claims limits.
Claims (4)
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| CN201210276714.6A CN102778554B (en) | 2012-08-06 | 2012-08-06 | Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process |
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|---|---|---|---|
| CN201210276714.6A CN102778554B (en) | 2012-08-06 | 2012-08-06 | Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process |
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| CN102778554A CN102778554A (en) | 2012-11-14 |
| CN102778554B true CN102778554B (en) | 2014-08-13 |
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