CN103993867B - A kind of experimental provision simulating shale air pressure fracturing process and experimental technique - Google Patents
A kind of experimental provision simulating shale air pressure fracturing process and experimental technique Download PDFInfo
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- CN103993867B CN103993867B CN201410235314.XA CN201410235314A CN103993867B CN 103993867 B CN103993867 B CN 103993867B CN 201410235314 A CN201410235314 A CN 201410235314A CN 103993867 B CN103993867 B CN 103993867B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 30
- 238000002474 experimental method Methods 0.000 title claims abstract description 29
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 70
- 230000000694 effects Effects 0.000 abstract description 12
- 230000008859 change Effects 0.000 abstract description 7
- 238000009533 lab test Methods 0.000 abstract description 6
- 238000011156 evaluation Methods 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000004459 forage Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
A kind of experimental provision simulating shale air pressure fracturing process and experimental technique, belong to shale gas exploitation engineering technical field.The present invention is made up of true triaxial loading unit and air pressure frac system unit, true triaxial loading unit provides true triaxial stress loading, under true triaxial stress state, air pressure frac system unit simulation shale air pressure fracturing process, meet air pressure fracture simulation laboratory experiment requirement, meet gas boosting, it is achieved shale sample pressure break and cracks can spread, and waste gas recovery can be realized；Before air pressure fracturing experiments, can measuring the stress-strain relation of shale sample, shale sample, after air pressure pressure break, also can directly be measured the change contrasting the permeability before and after shale sample pressure break, accurate evaluation fracturing effect；By changing the pressure break gas in gas cylinder, it is possible to help experimenter to find most suitable pressure break gas, and help experimenter to study shale fracture breaks mechanism, provide theoretical foundation for realizing fracturing yield increasing.
Description
Technical field
The invention belongs to shale gas exploitation engineering technical field, particularly relate to a kind of experimental provision simulating shale air pressure fracturing process and experimental technique.
Background technology
Shale gas is as a kind of Unconventional forage; the different exploitation with conventional gas of its production technique; and mainly include hydraulic pressure fracturing technique and air pressure fracturing technique; wherein hydraulic pressure fracturing technique is the most ripe in the U.S.; but hydraulic pressure fracturing technique needs to expend substantial amounts of water resource, and also needs in water add substantial amounts of chemicals, thus result in the pollution of subsoil water; therefore from environmental conservation angle, hydraulic pressure fracturing technique not environmentally.
And air pressure fracturing technique is as a kind of up-to-date production technique, there is the advantage of water saving and environmental protection, and this technology has carried out industrial experiment in Canada's shale test gas field, and reached desirable experiment effect.
At present, in order to study air pressure fracturing technique further, it is requisite for carrying out fracture simulation laboratory experiment, but existing fracture simulation laboratory experiment is all for hydraulic pressure fracturing technique, shale air pressure fracturing experiments device cannot simply be transplanted or be adjusted to by experimental provision for shale hydraulic pressure pressure break, and the fracture simulation laboratory experiment that more existing air pressure fracturing experiments devices are when can only meet normal triaxial, present stage disclosure satisfy that fracture simulation laboratory experiment when true triaxial but without a kind of shale air pressure fracturing experiments device, more cannot realize finding the purpose of suitable pressure break gas, also cannot accurate evaluation fracturing effect.
Summary of the invention
For prior art Problems existing, the present invention provides a kind of experimental provision simulating shale air pressure fracturing process and experimental technique, can under true triaxial stress state, meet gas boosting, realize shale sample pressure break and cracks can spread, and waste gas recovery can be realized, meet the purpose finding suitable pressure break gas.
To achieve these goals, the present invention adopts the following technical scheme that a kind of experimental provision simulating shale air pressure fracturing process, including true triaxial loading unit and air pressure frac system unit, described true triaxial loading unit includes vertical loading frame, horizontal addload framework, pressure chamber and support platform, described vertical loading frame is arranged on support platform by support cylinder, described horizontal addload framework is arranged on support platform by rail plate, vertical loading frame is mutually orthogonal with horizontal addload framework, described pressure chamber is arranged in horizontal addload framework, shale sample is positioned at pressure chamber；
Described air pressure frac system unit includes gas cylinder, supercharger, the first high-pressure metering pump, the second high-pressure metering pump, vacuum pump and gas sampling tank, described gas cylinder is connected with supercharger, supercharger one tunnel is connected with the first high-pressure metering pump, another road of supercharger is connected with the second high-pressure metering pump, second high-pressure metering pump one tunnel is connected with shale sample, second high-pressure metering pump the second tunnel is connected with vacuum pump, and the second high-pressure metering pump the 3rd tunnel is connected with gas sampling tank.
Pipeline between described gas cylinder and supercharger is provided with pressure regulator valve, the pipeline between pressure regulator valve and supercharger is disposed with the first switch valve and second switch valve.
Pipeline between described supercharger and the second high-pressure metering pump is provided with the 3rd switch valve.
Pipeline between described second high-pressure metering pump and shale sample is connected to pressure transducer, the pipeline between the second high-pressure metering pump and pressure transducer is disposed with the 4th switch valve and the 5th switch valve.
The air inlet of described vacuum pump is provided with the 6th switch valve, the air inlet of described gas sampling tank is provided with the 7th switch valve, described shale sample with the public air inlet pipeline of vacuum pump and gas sampling tank are provided with the 8th switch valve.
Adopt the experimental technique of the experimental provision of described simulation shale air pressure fracturing process, comprise the steps:
Step one: before experiment, to shale sample drilling machining center hole, centre bore is through the geometric center of shale sample；
Step 2: shale sample and pressure-bearing cushion block are carried out clamping, and the pressure-bearing cushion block of side, shale sample centre bore aperture is processed in advance gas port, centre bore passes through gas port and is connected externally to lead to；Again the shale sample after clamping and pressure-bearing cushion block are carried out encapsulation process, sealed rear fixing body and become measurement sensor, constituted sample assembly；
Step 3: sample assembly is sent in pressure chamber, first body is become the data line measuring sensor to be connected with the corresponding data port in pressure chamber, then air pressure frac system unit and shale sample centre bore are connected, now confining pressure room, oil-filled pressurization, and load the true triaxial stress in big principal stress, intermediate principal stress and minor principal stress direction, by the stress-strain relation of true triaxial stress loading process measurement shale sample；
Step 4: start air pressure fracturing experiments, before experiment, starts vacuum pump and gets rid of the air in pipeline and in shale sample centre bore；
Step 5: make the pressure break gas in gas cylinder enter supercharger through pressure regulator valve, sets the pressure in supercharger and pipeline by pressure regulator valve, closes gas cylinder, and then passing through the first high-pressure metering pump increases the pressure in pipeline；
Step 6: close supercharger gas outlet, pipeline internal gas pressure pressure rates is regulated by the second high-pressure metering pump, injected flow and the pressure data of pressure break gas by the second high-pressure metering pump collection simultaneously, until the second high-pressure metering pump occurs that pressure drop and body become measures sensor number value mutation, shale sample completes first pressure break, simultaneously by the frac pressure in pipeline in the first fracturing process of pressure transducer record；
Step 7: observing the intrinsic pressure flow splitting gas of pipeline by the second high-pressure metering pump and consume numerical value, until continuous consumption occurs in the flow of pressure break gas, now shale sample completes extension pressure break, and fracturing process terminates；
Step 8: collected by the residual gas in shale sample and in pipeline by gas sampling tank, now air pressure frac system unit is prepared for air pressure fracturing experiments next time.
Beneficial effects of the present invention:
The present invention under true triaxial stress state, can simulate shale air pressure fracturing process, meet the requirement of air pressure fracture simulation laboratory experiment, meet gas boosting, it is achieved shale sample pressure break and cracks can spread, and can realize waste gas recovery；Before air pressure fracturing experiments, can measuring the stress-strain relation of shale sample, shale sample, after air pressure pressure break, also can directly be measured the change contrasting the permeability before and after shale sample pressure break, accurate evaluation fracturing effect；By changing the pressure break gas in gas cylinder, it is possible to help experimenter to find most suitable pressure break gas, and help experimenter to study shale fracture breaks mechanism, provide theoretical foundation for realizing fracturing yield increasing.
Accompanying drawing explanation
Fig. 1 is the true triaxial loading unit structural representation in the embodiment of the present invention；
Fig. 2 is the air pressure frac system unit pipeline connection diagram in the embodiment of the present invention；
Fig. 3 is the clamping schematic diagram of shale sample and pressure-bearing cushion block in embodiment；
Fig. 4 is that in embodiment, shale sample and pressure-bearing cushion block fixing body become the sample assembly schematic diagram after measuring sensor；
In figure, the vertical loading frame of 1-, 2-horizontal addload framework, 3-pressure chamber, 4-supports platform, 5-support cylinder, 6-rail plate, 7-shale sample, 8-gas cylinder, 9-supercharger, 10-the first high-pressure metering pump, 11-the second high-pressure metering pump, 12-vacuum pump, 13-gas sampling tank, 14-pressure regulator valve, 15-pressure transducer, 16-the first switch valve, 17-second switch valve, 18-the 3rd switch valve, 19-the 4th switch valve, 20-the 5th switch valve, 21-the 6th switch valve, 22-the 7th switch valve, 23-the 8th switch valve, 24-centre bore, 25-gas port, the big principal stress body of 26-becomes sensor, 27-intermediate principal stress body becomes sensor, 28-minor principal stress body becomes sensor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, 2, a kind of experimental provision simulating shale air pressure fracturing process, including true triaxial loading unit and air pressure frac system unit, described true triaxial loading unit includes vertical loading frame 1, horizontal addload framework 2, pressure chamber 3 and supports platform 4, described vertical loading frame 1 is arranged on support platform 4 by support cylinder 5, described horizontal addload framework 2 is arranged on support platform 4 by rail plate 6, vertical loading frame 1 is mutually orthogonal with horizontal addload framework 2, described pressure chamber 3 is arranged in horizontal addload framework 2, and shale sample 7 is positioned at pressure chamber 3；
Described air pressure frac system unit includes gas cylinder 8, supercharger the 9, first high-pressure metering pump the 10, second high-pressure metering pump 11, vacuum pump 12 and gas sampling tank 13, described gas cylinder 8 is connected with supercharger 9, supercharger 9 one tunnel is connected with the first high-pressure metering pump 10, another road of supercharger 9 is connected with the second high-pressure metering pump 11, second high-pressure metering pump 11 1 tunnel is connected with shale sample 7, second high-pressure metering pump 11 second tunnel is connected with vacuum pump 12, and the second high-pressure metering pump 11 the 3rd tunnel is connected with gas sampling tank 13.
Pipeline between described gas cylinder 8 and supercharger 9 is provided with pressure regulator valve 14, pipeline between pressure regulator valve 14 and supercharger 9 is disposed with the first switch valve 16 and second switch valve 17, the effect of the first switch valve 16 is the keying controlling gas cylinder 8, and the effect of second switch valve 17 is the keying controlling supercharger 9 air inlet.
Being provided with the 3rd switch valve 18 on pipeline between described supercharger 9 and the second high-pressure metering pump 11, the effect of the 3rd switch valve 18 is the keying controlling supercharger 9 gas outlet.
Pipeline between described second high-pressure metering pump 11 and shale sample 7 is connected to pressure transducer 15, being disposed with the 4th switch valve 19 and the 5th switch valve 20 on pipeline between the second high-pressure metering pump 11 and pressure transducer 15, the effect of the 4th switch valve 19 and the 5th switch valve 20 is the keying controlling place pipeline.
The air inlet of described vacuum pump 12 is provided with the 6th switch valve 21, the air inlet of described gas sampling tank 13 is provided with the 7th switch valve 22, described shale sample 7 with the public air inlet pipeline of vacuum pump 12 and gas sampling tank 13 are provided with the 8th switch valve 23, the effect of the 6th switch valve 21 is the keying controlling vacuum pump 12 air inlet, the effect of the 7th switch valve 22 is the keying controlling gas sampling tank 13 air inlet, and the effect of the 8th switch valve 23 is the pressure when shale sample 7 pressure break in closing pipe line.
According to requirement of experiment, the dimensions of shale sample 7 has three kinds of selections, respectively 50 × 50 × 100mm, 75 × 75 × 150mm and 100 × 100 × 200mm, in the present embodiment, for the shale sample 7 of 75 × 75 × 150mm.Pressure break gas in gas cylinder 8 is on pretreatment it has been determined that the conventional optional nitrogen of pressure break gas, carbon dioxide, helium, methane or mixing gas etc., it is possible to for being used for the new gas found, in the present embodiment, and pressure break gas is for nitrogen.In the present embodiment, the pressure operating range of pressure break gas is 0～100MPa, and the big principal stress that true triaxial loading unit applies is 300MPa, and intermediate principal stress is 300MPa, and minor principal stress is 100MPa.
Adopt the experimental technique of the experimental provision of described simulation shale air pressure fracturing process, comprise the steps:
Step one: before experiment, to shale sample 7 drilling machining center hole, this centre bore is used for dummy level drilling well, and centre bore is through the geometric center of shale sample 7, and center-hole diameter is 8mm, 10mm or 12mm, and the hole depth of centre bore is 100mm；
Step 2: shale sample 7 and pressure-bearing cushion block are carried out clamping, and the pressure-bearing cushion block of side, shale sample 7 centre bore 24 aperture is processed in advance gas port 25, centre bore 24 passes through gas port 25 and is connected externally to lead to, specifically as shown in Figure 3；Again the shale sample 7 after clamping is carried out encapsulation process with pressure-bearing cushion block, sealing is installed the change of big principal stress body successively and is measured sensor 26, intermediate principal stress body change measurement sensor 27 and minor principal stress body change measurement sensor 28 after completing, now constitute sample assembly, specifically as shown in Figure 4；
Step 3: sample assembly is sent in pressure chamber 3, first large, medium and small body is become the data line measuring sensor to be connected with the corresponding data port in pressure chamber 3, then air pressure frac system unit and shale sample 7 centre bore 24 are connected, now confining pressure room 3, oil-filled pressurization, and load the true triaxial stress in big principal stress, intermediate principal stress and minor principal stress direction, by the stress-strain relation of true triaxial stress loading process measurement shale sample 7；
Step 4: starting air pressure fracturing experiments, before experiment, the first switch valve 16, second switch valve 17 and the 7th switch valve 22 are closed, rest switch valve is opened, and starts vacuum pump 12 and gets rid of the air in pipeline and in shale sample 7 centre bore 24；
Step 5: the first switch valve 16 and second switch valve 17 are opened, pressure break gas in gas cylinder 8 enters supercharger 9 through pressure regulator valve 14, pressure in supercharger 9 and pipeline is set as 10MPa by pressure regulator valve 14, first switch valve 16 and second switch valve 17 are closed, then passing through the pressure that the first high-pressure metering pump 10 increases in pipeline, pressure increases within the scope of 30～50MPa；
Step 6: the 3rd switch valve 18 cuts out, supercharger 9 gas outlet is closed, pipeline internal gas pressure pressure rates is regulated by the second high-pressure metering pump 11, atmospheric pressure speed range for 0.01～5MPa/min, gathered the flow and pressure data that inject pressure break gas by the second high-pressure metering pump 11 simultaneously, until the second high-pressure metering pump 11 occurs that pressure drop and body become measures sensor number value mutation, shale sample 7 completes first pressure break, the frac pressure simultaneously recorded in first fracturing process in pipeline by pressure transducer 15；
Step 7: observing the intrinsic pressure flow splitting gas of pipeline by the second high-pressure metering pump 11 and consume numerical value, until continuous consumption occurs in the flow of pressure break gas, now shale sample 7 completes extension pressure break, and fracturing process terminates；
Step 8: the 7th switch valve 22 is opened, is collected the residual gas in shale sample 7 and in pipeline by gas sampling tank 13, and now air pressure frac system unit is prepared for air pressure fracturing experiments next time.
If the pressure break gas that next time, air pressure fracturing experiments used is not changed, only the residual gas in pipeline after the 5th switch valve 20 need to be collected.
Shale sample 7, after air pressure pressure break, also can directly be measured the change contrasting the permeability before and after shale sample 7 pressure break, accurate evaluation fracturing effect, be provided theoretical foundation for realizing fracturing yield increasing.
According to above-mentioned air pressure fracturing process, by changing different pressure break gas, it is possible to help experimenter to search out most suitable pressure break gas, provide theoretical foundation for realizing fracturing yield increasing.
Scheme in embodiment is also not used to the scope of patent protection of the restriction present invention, and all equivalences done without departing from the present invention are implemented or change, and are both contained in the scope of the claims of this case.
Claims (6)
1. the experimental provision simulating shale air pressure fracturing process, it is characterized in that: include true triaxial loading unit and air pressure frac system unit, described true triaxial loading unit includes vertical loading frame, horizontal addload framework, pressure chamber and supports platform, described vertical loading frame is arranged on support platform by support cylinder, described horizontal addload framework is arranged on support platform by rail plate, vertical loading frame is mutually orthogonal with horizontal addload framework, described pressure chamber is arranged in horizontal addload framework, and shale sample is positioned at pressure chamber；
Described air pressure frac system unit includes gas cylinder, supercharger, first high-pressure metering pump, second high-pressure metering pump, vacuum pump and gas sampling tank, described gas cylinder is connected with supercharger, supercharger one tunnel is connected with the first high-pressure metering pump, another road of supercharger is connected with the second high-pressure metering pump, second high-pressure metering pump one tunnel is connected with shale sample, second high-pressure metering pump the second tunnel is connected with vacuum pump, second high-pressure metering pump the 3rd tunnel is connected with gas sampling tank, described gas sampling tank and vacuum pump are connected with shale sample by a public air inlet pipeline.
2. a kind of experimental provision simulating shale air pressure fracturing process according to claim 1, it is characterized in that: the pipeline between described gas cylinder and supercharger is provided with pressure regulator valve, the pipeline between pressure regulator valve and supercharger is disposed with the first switch valve and second switch valve.
3. a kind of experimental provision simulating shale air pressure fracturing process according to claim 1, it is characterised in that: the pipeline between described supercharger and the second high-pressure metering pump is provided with the 3rd switch valve.
4. a kind of experimental provision simulating shale air pressure fracturing process according to claim 1, it is characterized in that: the pipeline between described second high-pressure metering pump and shale sample is connected to pressure transducer, the pipeline between the second high-pressure metering pump and pressure transducer is disposed with the 4th switch valve and the 5th switch valve.
5. a kind of experimental provision simulating shale air pressure fracturing process according to claim 1, it is characterized in that: the 6th switch valve is installed on the air inlet of described vacuum pump, the air inlet of described gas sampling tank is provided with the 7th switch valve, described shale sample with the public air inlet pipeline of vacuum pump and gas sampling tank are provided with the 8th switch valve.
6. the experimental technique of the experimental provision of the simulation shale air pressure fracturing process described in employing claim 1, it is characterised in that: comprise the steps:
Step one: before experiment, to shale sample drilling machining center hole, centre bore is through the geometric center of shale sample；
Step 2: shale sample and pressure-bearing cushion block are carried out clamping, and the pressure-bearing cushion block of side, shale sample centre bore aperture is processed in advance gas port, centre bore passes through gas port and is connected externally to lead to；Again the shale sample after clamping and pressure-bearing cushion block are carried out encapsulation process, sealed rear fixing body and become measurement sensor, constituted sample assembly；
Step 3: sample assembly is sent in pressure chamber, first body is become the data line measuring sensor to be connected with the corresponding data port in pressure chamber, then air pressure frac system unit and shale sample centre bore are connected, now confining pressure room, oil-filled pressurization, and load the true triaxial stress in big principal stress, intermediate principal stress and minor principal stress direction, by the stress-strain relation of true triaxial stress loading process measurement shale sample；
Step 4: start air pressure fracturing experiments, before experiment, starts vacuum pump and gets rid of the air in pipeline and in shale sample centre bore；
Step 5: make the pressure break gas in gas cylinder enter supercharger through pressure regulator valve, sets the pressure in supercharger and pipeline by pressure regulator valve, closes gas cylinder, and then passing through the first high-pressure metering pump increases the pressure in pipeline；
Step 6: close supercharger gas outlet, pipeline internal gas pressure pressure rates is regulated by the second high-pressure metering pump, injected flow and the pressure data of pressure break gas by the second high-pressure metering pump collection simultaneously, until the second high-pressure metering pump occurs that pressure drop and body become measures sensor number value mutation, shale sample completes first pressure break, simultaneously by the frac pressure in pipeline in the first fracturing process of pressure transducer record；
Step 7: observing the intrinsic pressure flow splitting gas of pipeline by the second high-pressure metering pump and consume numerical value, until continuous consumption occurs in the flow of pressure break gas, now shale sample completes extension pressure break, and fracturing process terminates；
Step 8: collected by the residual gas in shale sample and in pipeline by gas sampling tank, now air pressure frac system unit is prepared for air pressure fracturing experiments next time.
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| CN104594885B (en) * | 2014-10-16 | 2017-05-17 | 北京科技大学 | Measuring test device and method for seepage law of shale gas in microfractures |
| CN105134186B (en) * | 2015-08-18 | 2017-12-29 | 中国地质大学（武汉） | Shale gas hydraulic fracturing physical simulation experiment system |
| CN105136646A (en) * | 2015-09-15 | 2015-12-09 | 东北大学 | Permeability evolution experimental device and method considering shale adsorption and fracturing process |
| CN105332683B (en) * | 2015-11-16 | 2017-07-21 | 中国石油大学(北京) | Fracturing experiments device and method |
| CN105672974B (en) * | 2016-02-25 | 2018-06-29 | 重庆大学 | Supercritical carbon dioxide fracturing shale tests test specimen production method under triaxial stress |
| CN106918687A (en) * | 2017-04-19 | 2017-07-04 | 贵州大学 | A kind of hydraulic fracturing and water-blocking effect evaluate integrated device |
| CN110928181B (en) * | 2019-12-13 | 2021-04-13 | 东北大学 | Intelligent control method for hard rock post-peak damage process under true triaxial surface disturbance |
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| CA2538936A1 (en) * | 2006-03-03 | 2007-09-03 | Dwight N. Loree | Lpg mix frac |
| CN202850976U (en) * | 2012-10-19 | 2013-04-03 | 河南理工大学 | Gas and water flowing state and effect simulator in coalbed methane well discharging and mining process |
| CN203097887U (en) * | 2013-03-01 | 2013-07-31 | 河南理工大学 | Device for testing gas production contribution ability of coal bed with different fracture development degrees |
| CN103132971B (en) * | 2013-03-11 | 2015-08-12 | 河南理工大学 | Carbon dioxide injection improves the test simulator of coal bed methane recovery rate |
| CN203420700U (en) * | 2013-09-05 | 2014-02-05 | 东北石油大学 | Measuring device for rock fracture steering simulation experiment |
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