CN105277970B - A kind of hydraulic pressure based on optical fiber grating sensing splits microseism analogue experiment method - Google Patents
A kind of hydraulic pressure based on optical fiber grating sensing splits microseism analogue experiment method Download PDFInfo
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Abstract
The present invention provides a kind of hydraulic pressure based on optical fiber grating sensing to split microseism analogue experiment method, belongs to vibration detection field.This method includes：(1), in tested model enclosed inside diversion pipe, tested model is stretched out in one end of diversion pipe；Fiber-optic grating sensor in fiber-optic grating detection device is pasted on the surface of tested model；(2) tested model is placed on triaxial pressure device, which shifts tested model in Pressure chamber onto, and X-axis, Y-axis, Z axis pressurization stop being pressurized and remaining unchanged after reaching scheduled pressure；(3) the fluid output tube of water fracturing device is connect with the diversion pipe on tested model, carry out water pressurization, until tested model is completely severed；(4) constantly acquired in fracturing process due to being tested the microseism signal that model rupture generates using fiber-optic grating sensor, and be stored in computer for post-processing after being converted to digital signal.
Description
Technical field
The invention belongs to vibration detection fields, and in particular to a kind of hydraulic pressure based on optical fiber grating sensing splits microseism simulation
Experimental method.
Background technique
Hydraulic fracturing is an important technique measure of well production increment.It is not only widely used in Low permeable oil and gas reservoirs,
And good effect is achieved in the storey increase design of middle and high permeability gas reservoir.It is using ground high-pressure pump by fluid with significantly
More than in the discharge capacity injection well of formation absorption ability, high pressure has been suppressed in predetermined position in well.It is answered when this pressure is greater than neighbouring ground
When power and formation rock tensile strength, crack is generated near predetermined position to increase the permeative transport ability of oil gas.In rock
In the rupture process of equal fragile materials, the physical phenomenons such as sound, electromagnetism and deformation are generally accompanied with, wherein sound emission is a kind of common
Physical phenomenon.When rock or cement block are deformed or are broken by external force or endogenetic process, just discharged in the form of elastic wave
Ess-strain energy out, this phenomenon are referred to as microseism phenomenon.
So-called microseism Fracturing Monitoring technology is exactly to monitor in hydraulic fracturing process caused by subsurface rock rupture micro-ly
Signal is shaken, by data process and interpretation, the geometry and spatial that crack generates in fracturing process is described, draws crack
Direction, variation and the development degree of development provide scientific basis for oil gas and non-conventional gas exploitation.
At pressure break scene, strong mechanicalness noise and other environmental noises are interfered so that microseism signal is difficult to detect.It is logical
It crosses and simulates fracturing experiments indoors, the actual physics process that can be extended to rock fracture crack is monitored, and to formation
Crack directly observed, to obtain the true characteristic of crack microseism signal.This is for correctly recognizing certain layer position water
The mechanism of power crack extension, and establish have great importance closer to actual numerical model on this basis.
One complete indoor simulation hydraulic pressure, which splits experimental method, to be accomplished：
1. rock can be simulated in well in the force environment by triaxial pressure of different depth in a certain range；
2. the injection rate for injecting fluid should be adjustable controllable as needed, quickly note is needed when rock permeability is big
Enter, otherwise needs to inject at a slow speed；Crossing slow rock can not press off because practical fracturing process is long, it is too fast then can not true mould
Intend practical fracturing process.
3. the rock that within the bounds of possibility, can be tested may be big, bigger about close with actual conditions；
4. microseism point detection signal is as more as possible, detection sensor should have high sensitivity, broadband, size small and easy
In installation the features such as；
Due to various aspects, the existing microseism analogue experiment method for carrying out hydraulic fracturing simulated experiment is not able to satisfy
Whole requirements above, therefore fidelity is lower.One of major reason is to detect the sensor bulk phase of microseism signal
To larger, after triaxial pressure addition, the bad installation of sensor or installation number mostly after influence triaxial pressure effect.
Summary of the invention
It is an object of the invention to solve above-mentioned problem existing in the prior art, provide a kind of based on optical fiber grating sensing
Hydraulic pressure split microseism analogue experiment method, construct a kind of new hydraulic pressure by using technologies such as fiber-optic grating sensors and split micro-ly
Shake analogue experiment method.This method is by splitting and using up to experimental rock or cement block application triaxial pressure, the controllable hydraulic pressure of progress
Fiber grating sensor to microseismic signals carry out high density, broadband acquire, can in laboratory real simulation field water pressure break it is micro-
The process and collection process of the generation of seismic signal.
The present invention is achieved by the following technical solutions：
A kind of hydraulic pressure based on optical fiber grating sensing splits microseism analogue experiment method, including：
(1), in tested model enclosed inside diversion pipe, tested model is stretched out in one end of diversion pipe；Fiber grating is detected and is filled
The fiber-optic grating sensor set is pasted on the surface of tested model；
(2) tested model is placed on triaxial pressure device, which shifts tested model onto Pressure chamber
In, X-axis, Y-axis, Z axis pressurization stop being pressurized and remaining unchanged after reaching scheduled pressure；
(3) the fluid output tube of water fracturing device is connect with the diversion pipe on tested model, water pressurization is carried out, until quilt
Model is surveyed to be completely severed；
(4) carried out in fracturing process due to being tested the microseism signal that model rupture generates using fiber-optic grating sensor
Constantly acquisition, and computer is stored in for post-processing after being converted to digital signal.
The step (4) includes：
(41) judge collected any microseism signal together signal amplitude whether be more than setting threshold value, such as
Fruit is then to store and show data, (42) are then transferred to, if the signal amplitude of the microseism signal in all roads is not above
The threshold value of setting is then transferred to (42)；
(42) judge whether tested model has been crushed, if it is, be transferred to (43), if it is not, then water fracturing device after
Then pressure of continuing rising returns to (41)；
(43) stop pressurization and acquisition, experiment terminates.
The triaxial pressure device includes：X-axis, Y-axis, Z axis and hydraulic for respectively driving X-axis, Y-axis, the X-axis of Z axis
Driving device, Y-axis fluid pressure drive device and Z axis fluid pressure drive device, are respectively provided with X-axis pressing plate, Y-axis on X-axis, Y-axis, Z axis
Pressing plate, Z axis pressing plate are provided with stria on X-axis pressing plate, Y-axis pressing plate and Z axis pressing plate.
The triaxial pressure device includes forklift, determines beam and ejection cylinder afterwards；
Tested model is fitted into the Pressure chamber of triaxial pressure device by forklift, by controlling X-axis, Y-axis, Z axis for tested mould
Type push-in is compressed and is pressurizeed until pressure reaches predetermined value；
Diversion pipe is stretched out from the fluid injecting hole opened on Hou Dingliang, connect with the fluid output tube of water fracturing device so as to
Input high-pressure fluid；
The ejection cylinder from Pressure chamber for ejecting tested model.
The water fracturing device is pumped using constant speed and constant pressure；
Water pressurization is filled into inside tested model by diversion pipe and finally makes its rupture by constant speed and constant pressure pump.
The fiber-optic grating detection device includes：FP laser, circulator, dense wave division multiplexer, photodetector, A/
D converter, fiber-optic grating sensor and computer；The FP laser exports multiwavelength laser；
The FP laser is connect with the first port of the circulator, the second port of the circulator and the optical fiber
One end of grating sensor connects；The third port of the circulator is connect with the dense wave division multiplexer；
The dense wave division multiplexer is connect with the photodetector, and the photodetector is connect with A/D converter,
The A/D converter is connect with computer.
The fiber-optic grating sensor uses and carves multiple fiber gratings on an optical fiber and be made, or utilizes optical fiber
Multiple fiber gratings are sequentially connected in series and are made.
The designed central wavelength of every fiber grating and the output wavelength of FP laser match, i.e. a fiber grating pair
Answer an output wavelength of FP laser；
Each channel connection of the corresponding photodetector of each output wavelength, A/D conversion and data collecting card is all the way
Signal.
On the position and X-axis pressing plate, Y-axis pressing plate or Z axis pressing plate of the surface mount fiber-optic grating sensor of tested model
Stria it is corresponding, when X-axis pressing plate, Y-axis pressing plate or Z axis pressing plate compress tested model, the fiber-optic grating sensor is located at thin
In slot.
The laser of FP laser output enters circulator by the first port of circulator, then from the of circulator
Two-port netwerk enters fiber-optic grating sensor, and the signal of fiber-optic grating sensor reflection enters annular by the second port of circulator
Device, then export from the third port of circulator, into dense wave division multiplexer, dense wave division multiplexer is by fiber-optic grating sensor
It is input to photodetector after the wavelength-division multiplex signals separation of reflection, the optical signal after demodulation is converted into telecommunications by photodetector
Number, it is converted by A/D after carrying out data acquisition, send to computer and handled and shown.
Compared with prior art, the beneficial effects of the invention are as follows：By this method carry out indoor microseism experiment and
Post-processing can understand the relationship of waterpower rock rupture rule Yu rock institute stress, it is known that rock rupture generated
The parameters such as feature, frequency, the energy of microearthquake wave, fracture orientation, form and extension situation are monitored and describe, these numbers
According to can be used for fracture pattern research and analyse and for instruct field three-dimensional microseism explore.
Detailed description of the invention
Fig. 1 is triaxial pressure schematic diagram.
Fig. 2 is pressing plate fluting.
Fig. 3 is that hydraulic pressure splits working principle.
Fig. 4 is optical fiber grating sensing method.
Fig. 5 is the structural schematic diagram of this method equipment therefor.
Fig. 6-1 is collected first of microseism signal in embodiment
Fig. 6-2 is collected second microseism signal in embodiment
Fig. 6-3 is collected third road microseism signal in embodiment
Fig. 6-4 is collected 4th microseism signal in embodiment
Fig. 6-5 is collected 5th microseism signal in embodiment
Fig. 6-6 is collected 6th microseism signal in embodiment
Fig. 6-7 is collected 7th microseism signal in embodiment
Fig. 6-8 is collected 8th microseism signal in embodiment
Fig. 7 is the step block diagram of the method for the present invention.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing：
Hydraulic pressure based on optical fiber grating sensing splits the general frame of microseism experimental system for simulating as shown in figure 5, including three
Axis pressure apparatus 501 is tested model 502, water fracturing device 503, fiber-optic grating detection device 504.Based on optical fiber grating sensing
The hydraulic pressure of device splits microseism analogue experiment method and mainly consists of three parts, i.e. triaxial pressure analogy method, water fracture simulation side
Method and fiber-optic grating sensor detection method.
1. triaxial pressure analogy method
Triaxial pressure device 501 is as shown in Figure 1, include：X, Y, Z, three axis fluid pressure drive device 101,102,103, X-axis pressure
Plate 104 is tested model 105, can be cement block or rock, and forklift 106 determines beam 107 afterwards, ejects cylinder 108, test model
Diversion pipe 111.It adds pressing plate respectively on three axis, is convenient for Grating examinations, is only labelled with X-axis pressing plate on Fig. 1, Y, Z axis have
Pressing plate, and stria is all provided on pressing plate.
Triaxial pressure analogy method is to press from three mutually perpendicular directions to test rock or cement block 105, purpose
Rock or cement block are not damaged by pressure, the compression environment of simulation rock in the earth formation.It will be seen from figure 1 that tested rock
Or cement block is packed by forklift 106, three axis 101,102,103 by controlling three axis press can be by rock or cement block push-in pressure
Tight and pressurization reaches predetermined value until pressure.111 be to be inserted into rock or cement block and be bonded the diversion pipe sealed in figure, works as rock
Or after cement block shifts position onto, diversion pipe 111 is stretched out from the fluid injecting hole opened on Hou Dingliang 107, can split part with hydraulic pressure
Fluid output tube 309 connects to input high-pressure fluid.The effect that cylinder 108 is ejected in figure is after testing by rock or water
Clod ejects recycling from Pressure chamber.104 be X-axis pressing plate, and Y, Z axis also have pressing plate in figure.
2. hydraulic pressure splits analogy method
Water fracturing device 503 is pumped using universal constant speed and constant pressure, such as petroleum instrument limited public affairs Jiangsu jade-like stone can be used
The constant speed and constant pressure pump of the model KD-240 of production is taken charge of, as described in Figure 3, including：Piston pump 301,302, transfer valve 303,304,
Delivery valve 305,306, pressure gauge 307, excess pressure valve 308, fluid output tube 309, water 310.
By the way that water pressurization is filled into rock or 311 inside of cement block by diversion pipe and finally makes its rupture.Its method
It is first to be injected into water 310 301,302 in the pump housing through transfer valve 303,304, then as needed, is exported by predetermined speed.For
Guarantee pressure process will not have been exported because of water, interruption when refilling the pump housing, use two groups of concurrent working modes.Work as pump
301 through delivery valve 305 export when, pump 302 by transfer valve 304 input water；After pump 301 has been pressed, pump 302 is automatically engaged.In this way
Avoid the infiltration due to rock or cement block itself, the problem that pressure does not add.
Hydraulic pressure, which is split, can be used constant speed, constant pressure working method.The work that can be pumped by computer by software control.
3. multiple groups fiber-optic grating sensor laying method
Fiber-optic grating detection device 504 is as shown in figure 4, include：FP laser 401, circulator 402, dense wave division multipurpose
Device 403, photodetector 404, A/D converter 405, computer 406, fiber-optic grating sensor 407.FP laser 401 exports
Multiwavelength laser.By the way of carving multiple fiber-optic grating sensor FBG (quantity is not fixed) on an optical fiber.
The FP laser 401 is connect with the first port of the circulator 402, the second port of the circulator 402
It is connect with one end of the fiber-optic grating sensor 407；The third port of the circulator 402 and the dense wave division multiplexer
403 connections；
Institute's dense wave division multiplexer 403 is connect with the photodetector 404, and the photodetector 404 and A/D is converted
Device 405 connects, and the A/D converter 405 is connect with computer 406.If needing 8 light using 8 fiber gratings 103
Electric explorer, the corresponding photodetector of each wavelength, A/D capture card is also 8 channels, and each channel connects signal all the way.
The working principle of fiber-optic grating detection device is as follows：The laser of laser output passes through the first end of circulator 402
Mouthful, then enter fiber-optic grating sensor 407 from the second port of circulator 402, the signal of grating sensor reflection passes through ring
The second port of shape device enters circulator 402, then exports from third port, close into the dense wave division multiplexer 403 of multichannel
The wavelength-division multiplex signals that collection wavelength division multiplexer 403 reflects grating sensor separate, finally, will be solved by photodetector 404
Optical signal after tune is converted into electric signal, by A/D conversion 405 carry out data acquisitions after, send to computer 406 carry out processing and
Display.
Fiber-optic grating sensor has the characteristics that small in size, bandwidth and high sensitivity, with conventional piezoelectric formula sensor phase
Than when carrying out high density detection advantage it is obvious.When carrying out fracturing experiments, fiber-optic grating sensor is pasted onto tested rock
Stone or cement block surface can also be as needed generally in face of end clamp plate 201 before press X-axis, are pasted onto before press Y, Z axis
On end clamp plate 202,203.From Fig. 2, (104 in 201 corresponding diagrams 1 in Fig. 2, this is the pressing plate of X-direction, the pressing plate of Y, Z axis
It is identical with this, 201,202,203 be respectively X, Y, Z axis pressing plate) as can be seen that being provided on the pressing plate that X-axis press front end pushes
Multiple groups stria, opening these strias is not influence to apply to avoid the fiber-optic grating sensor pasted on rock or cement block simultaneously
Pressure.When pasting fiber-optic grating sensor, it is necessary to be pasted on the corresponding position of stria.Due to each fiber-optic grating sensor pole
Carefully (general long less than 1 centimetre, diameter is less than 200 microns), the Pasting multiple groups fiber grating on the corresponding position of a stria
Sensor (determine, such as can be used by multiple fiber gratings for carving on an optical fiber, the port number acquired when being designed according to system
8 fiber gratings, one group of fiber grating correspond to 8 channels in Fig. 4, i.e. eight wavelength), fiber grating is horizontal positioned, fluting
Length be greater than sensor length.In addition a plurality of stria can also be opened on pressing plate, therefore in this way can be as needed one
Enough fiber-optic grating sensors can be laid on a face.Another feature of optical fiber grating sensing is bandwidth (0-
200kHz), therefore obtained microseism signal spectrum is relatively abundanter.When the tested strain in the external world and temperature change, to light
The refractive index and grating space periodic of fine grating have an impact, and fiber grating sensing system carries out sensing grating reflectance spectrum real-time
Monitoring obtains wavelength variable quantity, and then analyzes the variation of external physical quantity.
4. the hydraulic pressure based on fiber-optic grating sensor splits experiment flow
(1) fiber-optic grating sensor 407 is pasted onto tested rock or cement block 105,
(2) then rock or cement block 105 are placed in triaxial pressure equipment, which shifts rock or cement block onto
The pressurization of three axis stops being pressurized and remaining unchanged after reaching scheduled pressure in pressure break storehouse.
(3) the output 309 of water fracturing device is connected with diversion pipe 111, water pressurization is carried out, until rock or cement block are complete
Full rupture.
Fiber-optic grating sensor 407 in fracturing process due to rock rupture generate microseism signal constantly adopt
Collection, and computer is stored in for post-processing after being converted to digital signal.
As shown in fig. 7, overall experimentation is as follows：First by fiber-optic grating sensor bonding partially in tested rock
502, then rock is placed in triaxial pressure equipment 501, which shifts onto rock in pressure break storehouse and pressurize until scheduled
Stop being pressurized and remaining unchanged after pressure.The output of water fracturing device 503 is connected with diversion pipe, is pressurizeed, until rock
It is completely severed.At the same time, fiber-optic grating detection device 504 constantly adopts the microseism signal tested in fracturing process
Collection, and computer is stored in for post-processing after being converted to digital signal.
When it is implemented, starting laser is acquired, but computer is true by collected signal in water pressurization former point
Vacation carries out judgement and decides whether to store.Such as setting signal threshold value, if signal amplitude is less than some preset threshold value,
Then it is considered interference signal, not stores；Otherwise it is considered effective as long as having signal to be together sometime more than threshold value
Signal (or event) is stored and is shown to the signal in set period of time before and after each road moment.
One embodiment of the present of invention is as follows：
One group of fibre optical sensor (8) is installed according to above-mentioned experiment flow 4., three axis then are carried out to cement block
Pressurization and hydraulic pressure are split, and are generated when rupture to give capture card after microseism signal is acquired by fibre optical sensor and be converted to digital signal and be sent
It is stored and processed to computer.Collected eight microseisms signal is as shown in Fig. 6-1 to Fig. 6-8 in embodiment.
Set of the present invention fiber grating sensing technology, hydraulic pressure split analogue technique and triaxial pressure analogue technique, form
A set of hydraulic pressure based on optical fiber grating sensing splits microseism analogy method.The method that the method applies triaxial pressure using control
The compression environment of simulation rock different depth in well carries out pressure break to test rock or cement block using controllable hydraulic pressure to simulate
Well water fracturing process generates crack and microseism signal, and fiber grating is utilized while applying triaxial pressure and water pressure
Sensor carries out multiple spot to the microseism signal that fracturing fracture generates and broadband detects, and obtains voltage signal, then voltage is believed
Number be converted into digital data transmission is handled to computer.Present invention can apply to hydraulic pressure to split microseism simulated experiment.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application method and principle, it is easy to make various types of improvement or deformation, be not limited solely to this
Invent method described in above-mentioned specific embodiment, therefore previously described mode is only preferred, and and do not have limitation
The meaning of property.
Claims (6)
1. a kind of hydraulic pressure based on optical fiber grating sensing splits microseism analogue experiment method, it is characterised in that：The method includes：
(1), in tested model enclosed inside diversion pipe, tested model is stretched out in one end of diversion pipe；It will be in fiber-optic grating detection device
Fiber-optic grating sensor be pasted on the surface of tested model；
(2) tested model is placed on triaxial pressure device, which shifts tested model in Pressure chamber onto, X
Axis, Y-axis, Z axis pressurization stop being pressurized and remaining unchanged after reaching scheduled pressure；
(3) the fluid output tube of water fracturing device is connect with the diversion pipe on tested model, carry out water pressurization, until being tested mould
Type is completely severed；
(4) carried out constantly in fracturing process due to being tested the microseism signal that model rupture generates using fiber-optic grating sensor
Acquisition, and computer is stored in for post-processing after being converted to digital signal；
The fiber-optic grating sensor uses and carves multiple fiber gratings on an optical fiber and be made, or will be more using optical fiber
A fiber grating is sequentially connected in series and is made；
The triaxial pressure device includes：X-axis, Y-axis, Z axis and for respectively driving X-axis, Y-axis, the X-axis hydraulic-driven of Z axis
Device, Y-axis fluid pressure drive device and Z axis fluid pressure drive device, be respectively provided on X-axis, Y-axis, Z axis X-axis pressing plate, Y-axis pressing plate,
Z axis pressing plate is provided with stria on X-axis pressing plate, Y-axis pressing plate and Z axis pressing plate；
The designed central wavelength of every fiber grating and the output wavelength of FP laser match, i.e., a fiber grating corresponds to FP
One output wavelength of laser；
Each channel of the corresponding photodetector of each output wavelength, A/D conversion and data collecting card connects signal all the way；
Tested model surface mount fiber-optic grating sensor position with it is thin on X-axis pressing plate, Y-axis pressing plate or Z axis pressing plate
Slot is corresponding, and when X-axis pressing plate, Y-axis pressing plate or Z axis pressing plate compress tested model, the fiber-optic grating sensor is located in stria.
2. the hydraulic pressure according to claim 1 based on optical fiber grating sensing splits microseism analogue experiment method, feature exists
In：The step (4) includes：
(41) judge collected any microseism signal together signal amplitude whether be more than setting threshold value, if
It is then to store and show data, be then transferred to (42), set if the signal amplitude of the microseism signal in all roads is not above
Fixed threshold value is then transferred to (42)；
(42) judge whether tested model has been crushed, if it is, (43) are transferred to, if it is not, then water fracturing device is after of continuing rising
Then pressure returns to (41)；
(43) stop pressurization and acquisition, experiment terminates.
3. the hydraulic pressure according to claim 1 based on optical fiber grating sensing splits microseism analogue experiment method, feature exists
In：The triaxial pressure device includes forklift, determines beam and ejection cylinder afterwards；
Tested model is fitted into the Pressure chamber of triaxial pressure device by forklift, is pushed away tested model by control X-axis, Y-axis, Z axis
Enter compression and pressurizes until pressure reaches predetermined value；
Diversion pipe is stretched out from the fluid injecting hole opened on Hou Dingliang, is connected with the fluid output tube of water fracturing device to input
High-pressure fluid；
The ejection cylinder from Pressure chamber for ejecting tested model.
4. the hydraulic pressure according to claim 3 based on optical fiber grating sensing splits microseism analogue experiment method, feature exists
In：The step (4) includes：The water fracturing device is pumped using constant speed and constant pressure；
Water pressurization is filled into inside tested model by diversion pipe and finally makes its rupture by constant speed and constant pressure pump.
5. the hydraulic pressure according to claim 4 based on optical fiber grating sensing splits microseism analogue experiment method, feature exists
In：The fiber-optic grating detection device includes：FP laser, circulator, dense wave division multiplexer, photodetector, A/D conversion
Device, fiber-optic grating sensor and computer；The FP laser exports multiwavelength laser；
The FP laser is connect with the first port of the circulator, the second port of the circulator and the fiber grating
One end of sensor connects；The third port of the circulator is connect with the dense wave division multiplexer；
Institute's dense wave division multiplexer is connect with the photodetector, and the photodetector is connect with A/D converter, the A/
D converter is connect with computer.
6. the hydraulic pressure according to claim 5 based on optical fiber grating sensing splits microseism analogue experiment method, feature exists
In：The laser of the FP laser output enters circulator by the first port of circulator, then from the second end of circulator
Mouth enters fiber-optic grating sensor, and the signal of fiber-optic grating sensor reflection enters circulator by the second port of circulator,
It is exported again from the third port of circulator, into dense wave division multiplexer, dense wave division multiplexer is anti-by fiber-optic grating sensor
It is input to photodetector after the wavelength-division multiplex signals separation penetrated, the optical signal after demodulation is converted into telecommunications by photodetector
Number, it is converted by A/D after carrying out data acquisition, send to computer and handled and shown.
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| CN109239801A (en) * | 2017-07-10 | 2019-01-18 | 中国石油化工股份有限公司 | Simulation system and method are split in minute-pressure |
| CN107449879B (en) * | 2017-07-25 | 2019-07-16 | 中国海洋石油总公司 | Three axis fracturing device of rock |
| CN112762851B (en) * | 2020-12-24 | 2022-12-02 | 哈尔滨工业大学 | Crack simulation calibration device based on fracture mechanics and optical fiber sensing |
| CN113865498B (en) * | 2021-09-07 | 2023-09-05 | 天津大学 | Deepwater pipeline damage monitoring method based on fiber bragg grating sensing |
| CN115248151B (en) * | 2022-06-24 | 2023-02-28 | 东北石油大学 | Rock core fixing device for real triaxial reservoir in-situ state hydraulic fracturing experiment |
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| US20010013934A1 (en) * | 1997-11-15 | 2001-08-16 | Malcolm Paul Varnham | Seismic sensor with interferometric sensing apparatus |
| US20110029293A1 (en) * | 2009-08-03 | 2011-02-03 | Susan Petty | Method For Modeling Fracture Network, And Fracture Network Growth During Stimulation In Subsurface Formations |
| CN101858926B (en) * | 2010-05-17 | 2012-03-14 | 哈尔滨工程大学 | Integrated two-dimensional fiber optic micro accelerometer based on four-core fiber optic |
| CN103513280B (en) * | 2012-06-19 | 2016-05-04 | 中国石油化工股份有限公司 | A kind of microseism monitoring simulation system |
| CN103513272B (en) * | 2012-06-19 | 2016-05-04 | 中国石油化工股份有限公司 | A kind of microseism analog monitoring method |
| CN103033842B (en) * | 2012-12-18 | 2016-01-20 | 电子科技大学 | Time division multiplexing array formula optical fiber grating earthquake ripple real-time monitoring system |
| CN103364070B (en) * | 2013-07-20 | 2015-07-15 | 北京航空航天大学 | Fiber bragg grating vibration sensing system based on volume phase grating demodulation |
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