CN104535727B - A kind of waterpower sandfrac system - Google Patents
A kind of waterpower sandfrac system Download PDFInfo
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- CN104535727B CN104535727B CN201510008771.XA CN201510008771A CN104535727B CN 104535727 B CN104535727 B CN 104535727B CN 201510008771 A CN201510008771 A CN 201510008771A CN 104535727 B CN104535727 B CN 104535727B
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Abstract
The invention provides a kind of waterpower sandfrac system, comprising: fracturing device is connected by the water injection interface of water inlet with pressure break test specimen, confined pressure room is arranged on the side of described pressure break test specimen; Axial compression room is for loading the axial compression value of pressure break test specimen; One end of first pressure head is connected with one end of pressure break test specimen, for launching shear wave and compressional wave signal; One end of second pressure head is connected with the other end of described pressure break test specimen, for receiving shear wave and compressional wave signal; Test specimen outer cover is connected to thermoplastic tube; Acoustic emission probe is socketed in the surface of thermoplastic tube, and for monitoring acoustic emission signal, the pressure break obtaining described pressure break test specimen plays the acoustic emission data of seam and fracture propagation; Wherein, described axial compression value and described confined pressure value is preset by control device, described fracturing liquid is injected described pressure break test specimen, when monitoring the hydraulic pressure bust of fracturing device, play rule and the migration rule of propping agent in test specimen fracture planes of seam and fracture propagation according to the acoustic emission data obtained, shear wave, compressional wave signal analysis pressure break.
Description
Technical Field
The invention belongs to the technical field of rock mechanics in petroleum engineering, and particularly relates to a hydraulic sand fracturing system.
Background
In recent years, the rapid development of unconventional natural gas represented by shale gas, tight sandstone gas and coal bed gas, which mainly includes clean energy such as shale gas, tight sandstone gas and coal bed gas, has attracted worldwide attention. At present, China urgently needs a large amount of high-quality clean energy. One of the main methods of non-conventional natural gas stimulation is hydraulic fracturing.
At present, hydraulic fracturing equipment used in the prior art can only measure the deformation and the fracture initiation pressure of rocks, cannot simulate hydraulic sand fracturing under different stratum stress conditions, cannot meet the observation of the migration conditions of the hydraulic sand fracturing and a propping agent, and further cannot provide a theoretical basis for on-site hydraulic sand fracturing.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a hydraulic sand fracturing system, which is used for solving the technical problem that a hydraulic fracturing device in the prior art cannot simulate hydraulic sand fracturing experiments under different stratum stress conditions.
The invention provides a hydraulic sand fracturing system, which comprises:
the fracturing device is connected with a water injection interface of a fracturing test piece through a water inlet and is used for injecting fracturing fluid mixed with a propping agent into the fracturing test piece;
the confining pressure chamber is arranged on one side of the fracturing test piece and is used for loading the confining pressure value of the fracturing test piece;
the axial pressure chamber is used for loading the axial pressure value of the fracturing test piece;
one end of the first pressure head is connected with one end of the fracturing test piece and used for transmitting transverse wave signals and longitudinal wave signals;
one end of the second pressure head is connected with the other end of the fracturing test piece and is used for receiving the transverse wave signal and the longitudinal wave signal;
the thermoplastic pipe is sleeved outside the fracturing test piece;
the acoustic emission probe is sleeved on the surface of the thermoplastic pipe and used for monitoring acoustic emission signals and acquiring acoustic emission data of fracture starting and fracture extension of the fracture test piece;
the axial pressure value and the confining pressure value are preset through a control device, the fracturing fluid is injected into the fracturing test piece through the control device, and when the control device monitors sudden drop of water pressure of the fracturing device, the rules of fracturing crack initiation and crack extension and the migration rule of the propping agent in the fracturing surface of the fracturing test piece are analyzed according to the acoustic emission data, the transverse wave signals and the longitudinal wave signals of the fracturing test piece.
In the above scheme, the first pressure head is connected to the control device through a first data line, and is configured to emit the transverse wave signal and the longitudinal wave signal;
the second pressure head is connected with the control device through a second data line and used for sending the received transverse wave signals and the received longitudinal wave signals to the control device;
and the acoustic emission probe is connected with the control device through a third data line and sends acoustic emission signals of fracturing crack initiation and crack extension of the fracturing test piece to the control device.
In the above solution, the system further includes:
the axial strain gauge is clamped on one side of the thermoplastic pipe and used for monitoring the axial strain of the fracturing test piece;
and the radial strain gauge is sleeved on the surface of the thermoplastic pipe and used for monitoring the radial strain of the fracturing test piece.
In the above scheme, the axial strain gauge is connected with the control device through a fourth data line, and is used for sending the axial strain of the fracturing test piece to the control device;
the radial strain gauge is connected with the control device through a fifth data line and used for sending the radial strain of the fracturing test piece to the control device.
In the above scheme, the acoustic emission probes comprise four probes which are sleeved on the surfaces of the thermoplastic pipes in a cross shape.
In the above solution, the system further includes:
one end of the ball head is attached to the other end of the first pressure head;
one end of the T-shaped block is attached to the other end of the ball head;
the other end of the T-shaped block is connected with two sides of one end of the frame through a movable cross rod;
the other end of the second pressure head is connected with one side of the test bed through a cushion block;
one end of the first sheet is connected with one end of the other side of the test bed, and the other end of the first sheet is connected with one side of the other end of the frame;
and one end of the second sheet is connected with the other end of the other side of the test bed, and the other end of the second sheet is connected with the other side of the other end of the frame.
In the above aspect, an axial pressure chamber is provided between the first sheet and the second sheet.
In the above aspect, the fracturing device includes:
a fracturing fluid chamber provided with a fracturing fluid mixed with a proppant;
one end of the first pipeline is connected with the fracturing liquid chamber, and the other end of the first pipeline is connected with the water inlet;
the first booster pump is arranged on the first pipeline and used for injecting the fracturing fluid into the fracturing test piece through the first pipeline and a first valve;
the vacuum pump is connected with the first pipeline through a second pipeline and is used for vacuumizing the first pipeline through a three-way valve before the fracturing fluid is injected into the fracturing test piece;
and the first overflow valve is connected with the first pipeline through a third pipeline and is used for overflowing and stabilizing the fracturing fluid.
In the above solution, the system further includes: a first hydraulic device; wherein the first hydraulic device comprises:
a first hydraulic oil chamber provided with first hydraulic oil;
one end of the fourth pipeline is connected with the first hydraulic oil chamber, and the other end of the fourth pipeline is connected with the first oil inlet;
the second booster pump is arranged on the fourth pipeline, and the hydraulic oil is injected into the confining pressure chamber through the fourth pipeline and a second valve;
one end of the fifth pipeline is connected with the first hydraulic oil chamber, and the other end of the fifth pipeline is connected with an oil outlet through a third valve;
and the second overflow valve is connected with the fourth pipeline through a sixth pipeline.
In the above solution, the system further includes: a second hydraulic device; wherein the second hydraulic device includes:
a second hydraulic oil chamber provided with second hydraulic oil;
one end of the seventh pipeline is connected with the second hydraulic oil chamber, and the other end of the seventh pipeline is connected with the second oil inlet;
the third booster pump is arranged on the seventh pipeline, and the hydraulic oil is injected into the axial pressure chamber through the seventh pipeline and a fourth valve;
and the third overflow valve is connected with the seventh pipeline through an eighth pipeline.
The invention provides a hydraulic sand fracturing system, which comprises: the fracturing device is connected with a water injection interface of a fracturing test piece through a water inlet and is used for injecting fracturing fluid mixed with a propping agent into the fracturing test piece; the confining pressure chamber is arranged on one side of the fracturing test piece and is used for loading the confining pressure value of the fracturing test piece; the axial pressure chamber is used for loading the axial pressure value of the fracturing test piece; one end of the first pressure head is connected with one end of the fracturing test piece and used for transmitting transverse wave signals and longitudinal wave signals; one end of the second pressure head is connected with the other end of the fracturing test piece and is used for receiving the transverse wave signal and the longitudinal wave signal; the thermoplastic pipe is sleeved outside the fracturing test piece; the acoustic emission probe is sleeved on the surface of the thermoplastic pipe and used for monitoring acoustic emission signals and acquiring acoustic emission data of fracture starting and fracture extension of the fracture test piece; the axial pressure value and the confining pressure value are preset through a control device, the fracturing fluid is injected into the fracturing test piece through the control device, and when the control device monitors sudden drop of water pressure of the fracturing device, the rules of fracturing crack initiation and crack extension and the migration rule of the propping agent in the fracturing surface of the fracturing test piece are analyzed according to the acoustic emission data, the transverse wave signals and the longitudinal wave signals of the fracturing test piece, so that the hydraulic sanding fracturing system can simulate hydraulic sanding fracturing under different stress conditions, can monitor the acoustic wave change rule of the fracturing test piece, the three-dimensional positioning of crack opening and extension and the migration rule of the propping agent in the crack in real time, and provides a theoretical basis for field hydraulic sanding fracturing.
Drawings
Fig. 1 is a schematic overall structure diagram of a hydraulic pressure system provided by an embodiment of the invention;
fig. 2 is a front view of a fracture test piece provided in an embodiment of the present invention.
Detailed Description
In order to simulate hydraulic sand fracturing experiments under different stress conditions and provide guarantee for the growth of unconventional natural gas, the invention provides a hydraulic sand fracturing system, which comprises: the confining pressure chamber is arranged on one side of the fracturing test piece and is used for loading the confining pressure value of the fracturing test piece; the axial pressure chamber is used for loading the axial pressure value of the fracturing test piece; one end of the first pressure head is connected with one end of the fracturing test piece and used for transmitting transverse wave signals and longitudinal wave signals; one end of the second pressure head is connected with the other end of the fracturing test piece and is used for receiving the transverse wave signal and the longitudinal wave signal; the thermoplastic pipe is sleeved outside the fracturing test piece; the acoustic emission probe is sleeved on the surface of the thermoplastic pipe and used for monitoring acoustic emission signals and acquiring acoustic emission data of fracture starting and fracture extension of the fracture test piece; the axial pressure value and the confining pressure value are preset through the control device, the fracturing fluid is injected into the fracturing test piece through the control device, and when the control device monitors sudden drop of the water pressure of the fracturing device, the rules of fracture starting and fracture extension and the migration rule of the propping agent in the fracturing surface of the fracturing test piece are analyzed according to the acoustic emission data, the transverse wave signals and the longitudinal wave signals of the fracturing test piece.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
The present embodiment provides a hydraulic sand fracturing system, as shown in fig. 1, including: the device comprises a fracturing device 1, a water inlet 2, a fracturing test piece 3, a water injection interface 4, a confining pressure chamber 5, an axial pressure chamber 6, a control device 7, a first hydraulic device 8 and a second hydraulic device 9; wherein,
the fracturing device 1 is connected with a water injection interface of the fracturing test piece 3 through a water inlet 2 and is used for injecting fracturing fluid mixed with a propping agent into the fracturing test piece 3 to perform a fracturing experiment.
Specifically, the fracturing device 1 includes: a fracturing liquid chamber 101, a first pipeline 102, a first booster pump 103, a first valve 104, a vacuum pump 105, a second pipeline 106, a three-way valve 107, a first overflow valve 108 and a third pipeline 109; wherein,
the fracturing fluid chamber 101 is provided with fracturing fluid mixed with proppant; one end of the first pipeline 102 is connected with the fracturing fluid chamber 101, and the other end of the first pipeline 102 is connected with the water inlet 2;
the first booster pump 103 is arranged on the first pipeline 102, and the first booster pump 103 injects the fracturing fluid into the fracturing test piece 3 through the first pipeline 102 and a first valve 104;
the vacuum pump 105 is connected with the first pipeline 102 through a second pipeline 106, and is used for vacuumizing the first pipeline 102 through a three-way valve 107 before the fracturing fluid is injected into the fracturing test piece 3, so that the influence of air compression on a fracturing experiment is eliminated.
The first overflow valve 108 is connected to the first pipeline 102 through a third pipeline 109, and is configured to overflow and stabilize the fracturing fluid when the fracturing fluid is injected into the fracturing test piece 3.
The confining pressure chamber 5 is arranged on one side of the fracturing test piece 3 and is used for loading the confining pressure value of the fracturing test piece 3; specifically, the control device 7 may set the confining pressure value, which is the oil pressure value of the hydraulic oil in the first hydraulic device 8, through the confining pressure chamber 5 according to actual experimental requirements.
The first hydraulic device 8 comprises: a first hydraulic oil chamber 80, a fourth pipeline 81, a first oil inlet 82, a second booster pump 83, a second valve 84, a fifth pipeline 85, a third valve 86, an oil outlet 87, a second overflow valve 88 and a sixth pipeline 89; wherein,
the first hydraulic oil chamber 80 is provided with first hydraulic oil, in the experimental process, the oil pressure of the first hydraulic oil is the confining pressure value, and the control device 7 can monitor the confining pressure value in real time;
one end of the fourth pipeline 81 is connected with the first hydraulic oil chamber 80, and the other end of the fourth pipeline 81 is connected with a first oil inlet 82;
the second booster pump 83 is arranged on the fourth pipeline 81, is connected with the control device 7, and injects the first hydraulic oil into the confining pressure chamber 5 through the fourth pipeline 81 and a second valve 84; here, since the surrounding pressure chamber 5 is filled with air before the first hydraulic oil is injected; in order to prevent the air compression in the confining pressure chamber 5 from affecting the fracturing experiment, the oil outlet 87 needs to be closed after the air is completely discharged through the oil outlet 87.
One end of the fifth pipeline 85 is connected to the first hydraulic oil chamber, and the other end of the fifth pipeline 85 is connected to an oil outlet 87 through a third valve 86, so as to discharge the first hydraulic oil out of the confining pressure chamber 5;
the second overflow valve 88 is connected to the fourth pipe 81 through a sixth pipe 89, and is configured to overflow and stabilize the first hydraulic oil when the first hydraulic oil is injected into the confining pressure chamber.
Here, the axial pressure chamber 6 is used for loading the axial pressure value of the fracturing test piece 3; specifically, the control device 7 may load the shaft pressure value, which is a pressure reflection value of the second hydraulic oil in the second hydraulic device, through the second booster pump 83 according to actual experimental requirements.
The second hydraulic device 9 includes: a second hydraulic oil chamber 91, a seventh pipeline 92, a second oil inlet 93, a third booster pump 94, a fourth valve 95, a third overflow valve 96 and an eighth pipeline 97; wherein,
and second hydraulic oil is arranged in the second hydraulic oil chamber 91, in the experimental process, the reflected value of the oil pressure of the second hydraulic oil is the shaft pressure value, and the control device 7 can monitor the shaft pressure value in real time.
One end of the seventh pipeline 92 is connected with the second hydraulic oil chamber 91, and the other end of the seventh pipeline 92 is connected with a second oil inlet 93;
the third booster pump 94 is provided on the seventh pipe 92, and injects the second hydraulic oil into the axial chamber 6 through the seventh pipe 92 and a fourth valve 95;
the third relief valve 96 is connected to the seventh conduit 92 through an eighth conduit 97, and is configured to relief and stabilize the pressure of the second hydraulic oil when the second hydraulic oil is injected into the axial compression chamber 6.
Here, the system further includes: the device comprises a first pressure head 10, a second pressure head 11, a thermoplastic pipe 12 and an acoustic emission probe 13; wherein,
one end of the first pressure head 10 is connected with one end of the fracturing test piece 3 and used for transmitting transverse wave signals and longitudinal wave signals. Wherein the first ram 10 is connected to the control device 7 via a first data line.
And one end of the second pressure head 11 is connected with the other end of the fracturing test piece 3 and is used for receiving the transverse wave signal and the longitudinal wave signal. The second pressure head 11 is connected with the control device 7 through a second data line, and the transverse wave signal and the longitudinal wave signal of the fracturing test piece 3 are sent to the control device 7 through the second data line.
The outside of fracturing test piece 3 has cup jointed thermoplastic pipe 12, can blow through hot blowing thermoplastic pipe 12, guarantees thermoplastic pipe 12 with fracturing test piece 3 zonulae occludens.
The acoustic emission probe 13 is sleeved on the surface of the thermoplastic pipe 12 and is used for monitoring the fracture starting and fracture extending displacement data of the fracture test piece 3; the acoustic emission probes 13 include four probes, and the four probes are sleeved on the surface of the thermoplastic pipe 12 in a cross shape. The acoustic emission probe 13 is connected with the control device 7 through a third data line, and transmits acoustic emission signals of fracture starting and fracture extension of the fracturing test piece 3 to the control device 7.
Here, the system further includes: axial strain gauges 14 and radial strain gauges 15; wherein,
the axial strain gauge 14 is clamped on one side of the thermoplastic pipe 12 and used for monitoring the axial strain of the fracturing test piece 3; the axial strain gauge 14 is connected with the control device 7 through a fourth data line, and is used for sending the axial strain of the fracturing test piece 3 to the control device 7.
The radial strain gauge 15 is sleeved on the surface of the thermoplastic pipe 12 and used for monitoring the radial strain of the fracturing test piece 3; the radial strain gauge 15 is connected with the control device 7 through a fifth data line and is used for sending the radial strain of the fracturing test piece 3 to the control device 7 through the fifth data line.
The system further comprises: the device comprises a ball head 16, a T-shaped block 17, a frame 18, a movable cross rod 19, a cushion block 20, a test bed 21, a first sheet 22 and a second sheet 23; wherein,
one end of the ball head 16 is attached to the other end of the first pressure head 10, so that the first pressure head 10 is in full contact with one end of the fracturing test piece 3 to prevent stress concentration;
one end of the T-shaped block 17 is attached to the other end of the ball head 16; the other end of the T-shaped block 17 is connected with two sides of one end of the frame 18 through a movable cross rod 19; here, the T-block 17 is connected to the control device 7 through a sixth data line, and the control device 7 controls the T-block 17 to move up and down along both sides of one end of the frame 18 through a moving cross bar 19 to fix the fracturing specimen 3 in a proper position for a fracturing experiment.
Here, the other end of the second ram 11 is connected to one side of the test bed 21 through a spacer 20;
one end of the first sheet 22 is connected with one end of the other side of the test bed 21, and the other end of the first sheet 22 is connected with one side of the other end of the frame 18;
one end of the second sheet 23 is connected to the other end of the other side of the test bed 21, and the other end of the second sheet 23 is connected to the other side of the other end of the frame 18. Wherein an axial pressure chamber 6 is provided between the first sheet 22 and the second sheet 23. The first sheet 22 and the second sheet 23 may be made of plastic and have a certain shrinkage property, so as to protect the axial pressure chamber 6 from being contaminated by dust.
In practical application, the hydraulic sand fracturing system provided by the invention can be used for carrying out experiments through the following steps:
step 1, preparing a fracturing test piece 3 from rocks such as shale and tight sandstone retrieved on site, wherein the fracturing test piece 3 is cylindrical as shown in fig. 2; the diameter of the bottom surface of the cylinder is 100mm, and the height of the cylinder is 200 mm.
Step 2, a cylindrical central hole is arranged in the center of the fracturing test piece 3 and is used for loading a metal hollow pipe 24, and the material of the hollow pipe 24 can comprise: stainless steel tubes, iron tubes, copper tubes, and the like. The height of the central hole is 113.5mm, and the diameter of the bottom surface of the central hole is 12 mm. The height of the hollow pipe 24 is 95mm, and the diameter of the bottom surface of the hollow pipe 24 is 6 mm. Here, epoxy resin 25 may be injected around the hollow tube 24, so that the hollow tube 24 and the fracturing test piece 3 are firmly adhered to achieve a sealing effect.
Step 3, with the fracturing test piece 3 that makes one end with first pressure head 10 is connected, the one end of hollow tube 24 with first pressure head 10 adopts "O" type circle sealed, cup joints thermoplastic pipe 12 with fracturing test piece 3's outside, blows through hot-blast wind thermoplastic pipe 12 guarantees thermoplastic pipe 12 with fracturing test piece 3 zonulae occludens.
And sleeving the acoustic emission probe 13 on the surface of the thermoplastic pipe 12, and connecting the acoustic emission probe 13 with the control device through a third data line. The axial strain gauge 14 is clamped on one side of the thermoplastic pipe 12, and the axial strain gauge 14 is connected with the control device 7 through a fourth data wire. Sleeving the radial strain gauge 15 on the surface of the thermoplastic pipe 12, and connecting the radial strain gauge 15 with the control device 7 through a fifth data line.
And 3, adjusting the T-shaped block 17 to move up and down to a proper position through the control device 7 so as to accurately fix the fracturing test piece in the frame 18.
And 4, setting the confining pressure value to a first specified value through a confining pressure chamber 5 and setting the shaft pressure value to a second specified value through a shaft pressure chamber 6 according to experimental requirements by using the control device 7.
Here, there are different first and second specified values due to different subsurface depths; for example, in the underground 1500 meters, the axial pressure value should be about 38MPa, the confining pressure value should be about 38MPa, and the specific value needs to be obtained by actual measurement. The experimental requirements include: different formation stress conditions.
And 5, injecting high-pressure fracturing fluid mixed with proppant into the fracturing test piece 3 according to a flow control mode, and stopping injecting when the control device 7 monitors that the pressure value of the fracturing fluid suddenly drops.
Here, the flow control mode is the volume of the fracturing fluid injected into the fracturing specimen 3 per unit time, and different flow control modes can be selected according to experimental requirements.
Step 6, the control device 7 acquires and stores the transverse wave signal and the longitudinal wave signal of the fracturing test piece 3 received by the second pressure head 11; acquiring acoustic emission data of fracture starting and fracture extension of the fracture test piece monitored by the acoustic emission probe 13; acquiring the axial strain of the fracturing test piece 3 monitored by the axial strain gauge 14; and acquiring the radial strain of the fracturing test piece 3 monitored by the radial strain gauge 15.
And analyzing the sound wave change rule of the fracturing test piece 3 under different stratum stress conditions.
Here, the compaction, crack, and the like of the fracture specimen 3 are analyzed from the acquired acoustic emission data. The acoustic wave includes: longitudinal waves and transverse waves.
And 7, taking out the fracturing test piece 3, and observing the fracture mode of the fracturing test piece 3 and the migration rule of the propping agent in the fracture surface of the fracturing test piece 3.
The hydraulic fracturing sand adding pressure system provided by the invention can simulate hydraulic fracturing sand adding fracturing experiments under different stratum stress conditions, monitor the three-dimensional positioning of the sound wave change, crack opening and crack extension of a fracturing test piece in the fracturing process in real time, observe the migration rule of a propping agent in cracks and provide a theoretical basis for field hydraulic fracturing sand adding.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A hydraulic sanding fracturing system, the system comprising:
the fracturing device is connected with a water injection interface of a fracturing test piece through a water inlet and is used for injecting fracturing fluid mixed with a propping agent into the fracturing test piece;
the confining pressure chamber is arranged on one side of the fracturing test piece and is used for loading the confining pressure value of the fracturing test piece;
the axial pressure chamber is used for loading the axial pressure value of the fracturing test piece;
one end of the first pressure head is connected with one end of the fracturing test piece and used for transmitting transverse wave signals and longitudinal wave signals;
one end of the second pressure head is connected with the other end of the fracturing test piece and is used for receiving the transverse wave signal and the longitudinal wave signal;
the thermoplastic pipe is sleeved outside the fracturing test piece;
the acoustic emission probe is sleeved on the surface of the thermoplastic pipe and used for monitoring acoustic emission signals and acquiring acoustic emission data of fracture starting and fracture extension of the fracture test piece;
wherein the system further comprises: the axial strain gauge is clamped on one side of the thermoplastic pipe and used for monitoring the axial strain of the fracturing test piece;
presetting the axial pressure value and the confining pressure value through a control device, injecting the fracturing fluid into the fracturing test piece through the control device, and analyzing the rules of fracturing crack initiation and crack extension and the migration rule of the propping agent in the fracturing surface of the fracturing test piece according to the acoustic emission data, the transverse wave signal and the longitudinal wave signal of the obtained fracturing test piece when the control device monitors that the water pressure of the fracturing device suddenly drops.
2. The system of claim 1, wherein said first ram is connected to said control device by a first data line for transmitting said shear wave signal and said longitudinal wave signal;
the second pressure head is connected with the control device through a second data line and used for sending the received transverse wave signals and the received longitudinal wave signals to the control device;
and the acoustic emission probe is connected with the control device through a third data line and sends acoustic emission signals of fracturing crack initiation and crack extension of the fracturing test piece to the control device.
3. The system of claim 1, wherein the system further comprises:
and the radial strain gauge is sleeved on the surface of the thermoplastic pipe and used for monitoring the radial strain of the fracturing test piece.
4. The system of claim 3, wherein the axial strain gauge is connected to the control device via a fourth data line for transmitting the axial strain of the fracturing test piece to the control device;
the radial strain gauge is connected with the control device through a fifth data line and used for sending the radial strain of the fracturing test piece to the control device.
5. The system of claim 1, wherein said acoustic emission probe comprises four, cross-shaped sockets on the surface of said thermoplastic pipe.
6. The system of claim 1, wherein the system further comprises:
one end of the ball head is attached to the other end of the first pressure head;
one end of the T-shaped block is attached to the other end of the ball head;
the other end of the T-shaped block is connected with two sides of one end of the frame through a movable cross rod;
the other end of the second pressure head is connected with one side of the test bed through a cushion block;
one end of the first sheet is connected with one end of the other side of the test bed, and the other end of the first sheet is connected with one side of the other end of the frame;
and one end of the second sheet is connected with the other end of the other side of the test bed, and the other end of the second sheet is connected with the other side of the other end of the frame.
7. The system of claim 6, wherein an axial plenum is disposed between the first sheet and the second sheet.
8. The system of claim 1, wherein the fracturing device comprises:
a fracturing fluid chamber provided with a fracturing fluid mixed with a proppant;
one end of the first pipeline is connected with the fracturing liquid chamber, and the other end of the first pipeline is connected with the water inlet;
the first booster pump is arranged on the first pipeline and used for injecting the fracturing fluid into the fracturing test piece through the first pipeline and a first valve;
the vacuum pump is connected with the first pipeline through a second pipeline and is used for vacuumizing the first pipeline through a three-way valve before the fracturing fluid is injected into the fracturing test piece;
and the first overflow valve is connected with the first pipeline through a third pipeline and is used for overflowing and stabilizing the fracturing fluid.
9. The system of claim 1, wherein the system further comprises: a first hydraulic device; wherein the first hydraulic device comprises:
a first hydraulic oil chamber provided with first hydraulic oil;
one end of the fourth pipeline is connected with the first hydraulic oil chamber, and the other end of the fourth pipeline is connected with the first oil inlet;
the second booster pump is arranged on the fourth pipeline, and the hydraulic oil is injected into the confining pressure chamber through the fourth pipeline and a second valve;
one end of the fifth pipeline is connected with the first hydraulic oil chamber, and the other end of the fifth pipeline is connected with an oil outlet through a third valve;
and the second overflow valve is connected with the fourth pipeline through a sixth pipeline.
10. The system of claim 1, wherein the system further comprises: a second hydraulic device; wherein the second hydraulic device includes:
a second hydraulic oil chamber provided with second hydraulic oil;
one end of the seventh pipeline is connected with the second hydraulic oil chamber, and the other end of the seventh pipeline is connected with the second oil inlet;
the third booster pump is arranged on the seventh pipeline, and the hydraulic oil is injected into the axial pressure chamber through the seventh pipeline and a fourth valve;
and the third overflow valve is connected with the seventh pipeline through an eighth pipeline.
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| CN106771052B (en) * | 2016-11-14 | 2019-05-28 | 河海大学 | A kind of circumferential direction and axial strain measuring device for rocks sample |
| CN106679871A (en) * | 2017-01-05 | 2017-05-17 | 中国石油大学(华东) | Method for obtaining actual stress value of rock under uniaxial acoustic emission by using internal friction angle |
| CN108489799B (en) * | 2018-02-27 | 2020-09-08 | 中国科学院武汉岩土力学研究所 | Rock gas triaxial/bare triaxial compression test device, system and method |
| CN108956311B (en) * | 2018-04-26 | 2020-06-30 | 中国科学院武汉岩土力学研究所 | Method for characterizing thin interbed fracture |
| CN109025948A (en) * | 2018-08-22 | 2018-12-18 | 重庆大学 | A kind of acid takes sand frac system and method |
| CN109001042A (en) * | 2018-09-17 | 2018-12-14 | 中国科学院地质与地球物理研究所 | A kind of three axis hydraulic fracturing experiments devices based on Fluid pressure load |
| CN109297830A (en) * | 2018-11-27 | 2019-02-01 | 山东大学 | A kind of refracturing laboratory testing rig and its operating method |
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| CN103954690B (en) * | 2014-04-25 | 2014-12-17 | 中国科学院武汉岩土力学研究所 | Method and device for synchronously measuring rock sound wave and acoustic emission |
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