Ground stress measurement and movable imaging integrated device based on hydraulic fracturing method

Abstract

The invention relates to the technical field of crustal stress measurement, in particular to a crustal stress measurement and movable imaging integrated device based on a hydraulic fracturing method, and the crustal stress measurement and movable imaging integrated device based on the hydraulic fracturing method comprises a packer, a fracturing assembly and a collecting assembly, the packer comprises a first packer and a second packer which are arranged at an interval to form a packing space, the fracturing assembly comprises a fracturing pipe which is provided with a fracturing cavity and a fracturing hole communicating the fracturing cavity with the packing space, the collecting assembly comprises a collecting barrel and an imaging component, and the collecting barrel is connected with the fracturing assembly and the second packer; the collecting cylinder is arranged in the fracturing assembly, the collecting cylinder can move in the vertical direction and can rotate in the vertical direction relative to the fracturing assembly, and the imaging component is arranged in the collecting cylinder and used for obtaining traces of induced fractures in real time, the crustal stress measurement and movable imaging integrated device based on the hydraulic fracturing method can obtain the clear traces of the induced fractures, and the accuracy of the crustal stress measurement and movable imaging integrated device based on the hydraulic fracturing method is improved. And the crustal stress measurement precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ground stress measurement, and in particular to a ground stress measurement and movable imaging integrated device based on a hydraulic fracturing method. Background Art

[0002] The hydraulic fracturing method is to measure the geostress by isolating a section of open rock in the borehole, injecting high-pressure liquid into the isolation section, and causing the rock mass in the borehole wall fracturing section to fracture to determine the magnitude and direction of the geostress. The hydraulic fracturing method has relatively loose environmental requirements and can measure the absolute stress state at a deeper depth. It is the most direct measurement method. After hydraulic fracturing, the rock mass in the borehole wall fracturing section will produce two symmetrical, perpendicular to the hole axis, and 180° parallel induced fractures. The azimuth of the induced fractures represents the direction of the maximum horizontal principal stress. Obtaining the direction of the maximum horizontal principal stress is an important part of the borehole hydraulic fracturing method geostress measurement.

[0003] In the related art, the traces of induced cracks are mostly collected through the impression method. However, the stress that induces the reopening of cracks in a borehole with a large stress value is relatively large, and the traces of induced cracks are difficult to be clearly printed on the impression rubber tube. Moreover, the traces printed on the surface of the impression rubber tube are easily worn away by the hole wall during the drilling process, resulting in unclear extracted traces and low accuracy of ground stress measurement. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention proposes a ground stress measurement and movable imaging integrated device based on hydraulic fracturing, which can obtain clear induced crack traces and improve the ground stress measurement accuracy.

[0005] The in-situ stress measurement and movable imaging integrated device based on the hydraulic fracturing method of the embodiment of the present invention comprises: a packer, the packer comprises a first packer and a second packer, the first packer and the second packer are arranged at intervals in the up and down directions to form an isolation space; a fracturing assembly, the fracturing assembly comprises a fracturing pipe, the fracturing pipe is arranged in the isolation space and connected to the first packer, one end of the fracturing pipe is suitable for communicating with a fracturing source, the fracturing pipe has a fracturing cavity and a fracturing hole, the fracturing hole connects the fracturing cavity and the isolation space so that the fracturing fluid can enter In the isolation space; a collecting assembly, the collecting assembly includes a collecting tube and an imaging component, one end of the collecting tube is rotatably connected to the fracturing assembly so that the collecting tube can form an angle with the vertical plane, the other end of the collecting tube is movably connected to the second packer, and the collecting tube can move and rotate in the up and down directions relative to the fracturing assembly and the second packer, at least a part of the imaging component is arranged in the collecting tube, and the imaging component includes an ultrasonic imaging part and / or a photographic imaging part, which is used to obtain traces of induced cracks in real time.

[0006] The in-situ stress measurement and movable imaging integrated device based on the hydraulic fracturing method according to the embodiment of the present invention can obtain clear traces of induced cracks and improve the accuracy of in-situ stress measurement.

[0007] In some embodiments, the integrated device for ground stress measurement and movable imaging based on hydraulic fracturing also includes a first control component, which includes a sleeve and a driving component. The sleeve is rotatably connected to the fracturing component so that the sleeve can form an angle with a vertical plane. At least a portion of the collecting tube is located in the sleeve and is sealingly and slidingly connected to the sleeve. The driving component is disposed in the sleeve and is connected to the collecting tube so that the collecting tube can move in the up and down directions and can rotate around the up and down directions relative to the sleeve.

[0008] In some embodiments, the ultrasonic imaging part includes an ultrasonic transmitting end and an ultrasonic receiving end, the ultrasonic transmitting end and the ultrasonic receiving end are arranged at intervals in the up and down directions, and the ultrasonic transmitting end is arranged in the sleeve, and the ultrasonic receiving end is arranged in the collecting tube.

[0009] In some embodiments, the fracturing assembly also includes a diverter pipe and a one-way valve, the diverter pipe having a first channel and a second channel, one end of the first channel is connected to the fracturing source, and the other end of the first channel passes through the driving component and the side wall of the collecting cylinder to communicate with the isolation space, the one-way valve is arranged in the first channel, and the second channel is used to pass a cable, one end of the cable is suitable for being connected to a ground cable, and the other end of the cable is connected to the imaging component.

[0010] In some embodiments, the driving component includes a driver and a telescopic rod, the driver is connected to the telescopic rod, the telescopic rod is connected to the collecting barrel, the first control component also includes a wire taking-up box, the wire taking-up box is arranged below the telescopic rod, the wire taking-up box is used to reel in and release the cable when the collecting barrel moves; and / or, the first control component also includes a hydraulic storage device, the hydraulic storage device is connected to the driver, and is used to generate electricity and store when the fracturing fluid in the first channel passes through.

[0011] In some embodiments, the integrated device for geostress measurement and movable imaging based on hydraulic fracturing also includes a second control component, the second control component includes a mounting tube and a hydraulic component, at least a portion of the collecting tube is installed in the mounting tube and can be moved in the up and down directions relative to the mounting tube, the hydraulic component includes a first hydraulic rod, one end of the first hydraulic rod is connected to the collecting tube, and the other end of the first hydraulic rod is connected to the second packer.

[0012] In some embodiments, the hydraulic component also includes a plurality of second hydraulic rods, which are divided into two groups in the up and down directions, each group of second hydraulic rods includes a plurality of second hydraulic rods arranged at intervals in the circumferential direction of the first hydraulic rod, one end of the second hydraulic rod is connected to the first hydraulic rod, and the other end of the second hydraulic rod can be extended and retracted along the radial direction of the first hydraulic rod and can abut against the inner wall surface of the mounting cylinder.

[0013] In some embodiments, the hydraulic component further includes a gasket and a rotating ball, wherein the gasket is disposed at the other end of the second hydraulic rod, and the rotating ball is disposed between the other end of the second hydraulic rod and the gasket.

[0014] In some embodiments, the second control assembly further comprises a telescopic table, one end of which is connected to the second packer, and the other end of which is connected to the other end of the first hydraulic rod.

[0015] In some embodiments, the integrated device for ground stress measurement and movable imaging based on hydraulic fracturing also includes a connector, the connector includes a buffer part and an adapter, the buffer part includes a buffer sleeve and a buffer spring, the buffer spring is arranged in the buffer sleeve, one end of the buffer sleeve is connected to the fracturing assembly, the other end of the buffer sleeve is connected to the adapter, and the adapter is connected to the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a ground stress measurement and movable imaging integrated device based on hydraulic fracturing method according to an embodiment of the present invention.

[0017] Figure 2It is a schematic diagram of a working state of a ground stress measurement and movable imaging integrated device based on a hydraulic fracturing method according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of a hydraulic fracturing-based geostress measurement and movable imaging integrated device in an inclined hole according to an embodiment of the present invention.

[0019] Figure 4 Schematic diagram of a fracturing assembly according to an embodiment of the present invention.

[0020] Figure 5 Schematic diagram of a collection component according to an embodiment of the present invention.

[0021] Figure 6 is a schematic diagram of a first control component according to an embodiment of the present invention.

[0022] Figure 7 is a schematic diagram of a second control component according to an embodiment of the present invention.

[0023] Figure 8 yes Figure 5 An enlarged schematic diagram of point A in FIG.

[0024] Fig. 9 Schematic diagram of a hydraulic component according to an embodiment of the present invention.

[0025] Fig.10 Schematic diagram of different states of the hydraulic components of an embodiment of the present invention.

[0026] Fig.11 Schematic diagram of a connector according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] Packer 1, first packer 11, cavity 111, second packer 12, sealed space 13,

[0029] Fracturing assembly 2, fracturing pipe 21, fracturing cavity 211, fracturing hole 212, diversion pipe 22,

[0030] One-way valve 23, valve body 231, water outlet channel 2311, first barrier 23111, second barrier 23112, compression spring 232, valve ball 233, fracturing connection pipe 24,

[0031] Collection assembly 3, collection tube 31, transparent window 311, sound-transmitting window 312, water-blocking belt 313, blocking part 314, imaging component 32,

[0032] Ultrasonic imaging unit 321, ultrasonic transmitting end 3211, ultrasonic receiving end 3212, ultrasonic probe 32121, photographic imaging unit 322, camera 3221, pressure sensor 33,

[0033] The first control assembly 4, the sleeve 41, the driving component 42, the driver 421, the telescopic rod 422, the wire collection box 43, the hydraulic storage device 44, the connecting rod 45,

[0034] The second control assembly 5, the mounting cylinder 51, the hydraulic component 52, the first hydraulic rod 521, the second hydraulic rod 522, the gasket 523, the rotating ball 524, the telescopic table 53,

[0035] Connector 6, buffer portion 61, buffer sleeve 611, buffer spring 612, adapter 62. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] The integrated device for measuring ground stress and movable imaging based on hydraulic fracturing in the embodiment of the present invention comprises a packer 1, a fracturing assembly 2 and a collecting assembly 3. The packer 1 comprises a first packer 11 and a second packer 12, which are arranged at intervals in the up-down direction to form an isolation space 13. The fracturing assembly 2 comprises a fracturing pipe 21, which is arranged in the isolation space 13 and connected to the first packer 11, one end of which is suitable for communicating with a fracturing source, and the fracturing pipe 21 has a fracturing cavity 211 and a fracturing hole 212, and the fracturing hole 212 connects the fracturing cavity 211 with the isolation space 13 so that the fracturing fluid can enter the isolation space 13. The collecting assembly 3 includes a collecting barrel 31 and an imaging component 32. One end of the collecting barrel 31 is rotatably connected to the fracturing assembly 2 so that the collecting barrel 31 can form an angle with the vertical plane. The other end of the collecting barrel 31 is movably connected to the second packer 12, and the collecting barrel 31 can move and rotate in the up and down directions relative to the fracturing assembly 2 and the second packer 12. At least a part of the imaging component 32 is arranged in the collecting barrel 31. The imaging component 32 includes an ultrasonic imaging part 321 and / or a photographic imaging part 322, which is used to obtain traces of induced cracks in real time.

[0038] Specifically, Figure 1-Figure 3 As shown, the first packer 11 is the upper packer 1 , the second packer 12 is the lower packer 1 , the first packer 11 abuts against the upper end hole wall, and the second packer 12 abuts against the lower end hole wall to form an isolation space 13 between the first packer 11 and the second packer 12 .

[0039] like Figure 4As shown, the fracturing assembly 2 also includes a fracturing connecting pipe 24, at least a portion of which is located in the isolation space 13, the first packer 11 has a cavity 111 isolated from the fracturing connecting pipe 24, the upper end of the fracturing connecting pipe 24 passes through the first packer 11 and is connected to the fracturing source, the lower end of the fracturing connecting pipe 24 is connected to the upper end of the fracturing pipe 21 to transport the fracturing fluid into the fracturing cavity 211, and since the fracturing hole 212 connects the fracturing cavity 211 with the isolation space 13, the fracturing fluid flows out of the fracturing cavity 211 through the multiple fracturing holes 212 into the isolation space 13 for fracturing.

[0040] like Figure 3 and Figure 5 As shown, the upper end of the collecting tube 31 is rotatably connected to the fracturing assembly 2 so that the collecting tube 31 can form an angle with the vertical plane. In other words, the collecting tube 31 can be tilted relative to the fracturing assembly 2 to facilitate the measurement of ground stress in the inclined hole. It can be understood that the inclination angle of the inclined hole is generally very small.

[0041] The lower end of the collecting barrel 31 is movably connected to the lower packer 1, and the imaging component 32 is arranged in the collecting barrel 31. The collecting barrel 31 can move in the up-down direction relative to the fracturing assembly 2 and the lower packer 1, that is, the collecting barrel 31 can move upward or downward in the isolation space 13, so as to adjust the position of the imaging component 32 in the isolation space 13 to obtain the hole wall information at different height positions. The collecting barrel 31 can rotate in the up-down direction relative to the fracturing assembly 2 and the lower packer 1, so that the collecting barrel 31 can rotate left or right in the isolation space 13, so as to adjust the orientation direction of the imaging component 32 in the isolation space 13 to obtain the hole wall information at different orientations and to image the fracture state in real time.

[0042] The imaging unit includes at least one camera 3221. A transparent window 311 corresponding to the camera 3221 is provided on the collecting tube 31. The camera 3221 is arranged toward the transparent window 311, so that the camera 3221 can shoot the hole wall. Optionally, there are two cameras 3221 and two transparent windows 311, and the two transparent windows 311 are symmetrically arranged in the radial direction of the collecting tube 31. For example, the camera 3221 can be installed on a cable to facilitate the control of the working state of the camera 3221.

[0043] The ultrasonic imaging unit 321 includes at least one ultrasonic probe 32121, and a sound-transmitting window 312 corresponding to the ultrasonic probe 32121 is provided on the collecting tube 31, and the detection direction of the ultrasonic probe 32121 is arranged toward the sound-transmitting window 312. Optionally, there are two ultrasonic probes 32121, two sound-transmitting windows 312, and the two sound-transmitting windows 312 are symmetrically arranged in the radial direction of the collecting tube 31, and the sound-transmitting windows 312 can block water and allow ultrasound to pass through, and the material of the sound-transmitting windows 312 is polytetrafluoroethylene.

[0044] Optionally, a pressure sensor 33 is also provided in the collecting cylinder 31 .

[0045] Optionally, the collecting tube 31 can withstand high-intensity water pressure to protect the safety of the camera imaging unit and the ultrasonic imaging unit 321. An electromagnetic compass can also be installed in the collecting tube 31 to record the position of the ultrasonic probe 32121, so as to know the position of the detected crack.

[0046] In the hydraulic fracturing experiment to measure geostress, multiple cycles of fracturing are carried out by performing a series of pressurization, closing and pressure-maintaining operations on the fracturing section. Finally, a series of mechanical parameters required for the calculation formula are obtained through instruments measuring water pressure above and below the ground to measure the geostress. Specifically, the stress field near the middle of the borehole that is pressurized during hydraulic fracturing consists of two parts, namely the uniform pressure in the hole and the geostress field (σ xx , σ yy , σ zz ), where σ xx , σ yy is the horizontal stress of rock formation; zz is the vertical principal stress of the rock formation. During hydraulic fracturing, when the fracturing section is closed, σ xx It can be approximated to be equal to the pressure of the ground cover. Based on the assumption that the fracture propagates along the path of least resistance, the closing pressure P s is equal to the minimum horizontal principal stress value and the fracture direction is perpendicular to the minimum principal stress direction. That is, σ min =P s (1); vertical principal stress σ zz It can be obtained by v =γd(2), where γ is the rock bulk density and d is the depth of the measured hole from the ground surface. According to the theory of elastic mechanics, the following formula can be derived: b -P0=T0+3σ min -σ max -2P0(3). Wherein, compressive stress is taken as positive value. b is the fracture pressure, P0 is the initial pore pressure of the rock, T0 is the tensile strength of the rock, σ min is the minimum horizontal principal stress, σ max is the maximum horizontal principal stress. The rock tensile strength can be obtained by processing the rock sample at the corresponding measuring depth into a thick-walled hollow cylinder, applying internal pressure to the cylinder until the rock breaks, and the pressure at the time of breaking is the rock tensile strength. s , P b After P0, the maximum horizontal principal stress can be calculated by equation (3), that is, σ max =T0+3P s -P b -P0(4)

[0047] In the embodiment of the present invention, a collecting component 3 connected to the fracturing component 2 is arranged in the isolation space 13, and the collecting tube 31 can move in the up-down direction and rotate around the up-down direction relative to the fracturing component 2 and the second packer 12, so that the imaging component 32 in the collecting tube 31 can move upward or downward in the isolation space 13 to obtain borehole wall information at different heights, and the imaging component 32 can rotate in the isolation space 13 to obtain borehole wall information at different orientations. The fracturing component 2 performs hydraulic fracturing on the borehole wall, and the collecting component performs real-time imaging of the borehole wall information. Fracturing and imaging can complete the test of the magnitude and direction of the principal stress in only one downhole fracturing operation, thereby greatly improving the measurement efficiency. In addition, since the imaging component 32 is movable and rotatable in the isolation space 13, it is convenient to dynamically image the borehole wall in the isolation space 13 and obtain clear induced crack traces. The imaging result is more accurate and reliable, thereby improving the measurement accuracy of ground stress.

[0048] In some embodiments, the integrated device for ground stress measurement and movable imaging based on hydraulic fracturing method also includes a first control component 4, which includes a sleeve 41 and a driving component 42. The sleeve 41 is rotatably connected to the fracturing component 2 so that the sleeve 41 can form an angle with the vertical plane. At least a portion of the collecting tube 31 is located in the sleeve 41 and is sealingly and slidingly connected to the sleeve 41. The driving component 42 is disposed in the sleeve 41 and is connected to the collecting tube 31 so that the collecting tube 31 can move in the up and down directions and can rotate around the up and down directions relative to the sleeve 41.

[0049] Specifically, Figure 6 As shown, the upper end of the sleeve 41 is connected to the fracturing assembly 2, the lower end of the sleeve 41 is sleeved on the collecting cylinder 31, and the driving component 42 is disposed in the sleeve 41 and connected to the upper end of the collecting cylinder 31. The collecting cylinder 31 can be moved and rotated in the up and down directions by the driving component 42, thereby facilitating the adjustment of the position and orientation of the imaging component 32 to obtain clear crack traces.

[0050] Optionally, a connecting rod 45 is further provided in the sleeve 41 , the upper end of the connecting rod 45 passes through the sleeve 41 and is connected to the upper end fracturing assembly 2 , and the lower end of the connecting rod 45 is connected to the upper end of the driving component 42 .

[0051] In some embodiments, Figure 1-Figure 3As shown, the ultrasonic imaging unit 321 includes an ultrasonic transmitting end 3211 and an ultrasonic receiving end 3212, which are arranged at intervals in the up-down direction, and the ultrasonic transmitting end 3211 is arranged in the sleeve 41, and the ultrasonic receiving end 3212 is arranged in the collecting tube 31. By arranging the ultrasonic transmitting end 3211 and the ultrasonic receiving end 3212 at different heights, it can be ensured that the ultrasonic receiving end 3212 can receive the ultrasonic signal emitted by the ultrasonic transmitting end 3211, and it can be ensured that the propagation path of the ultrasonic signal during the measurement process is relatively stable, thereby improving the measurement accuracy.

[0052] Optionally, the ultrasonic imaging unit 321 further includes an ultrasonic signal processing circuit, which is configured to convert the ultrasonic signal into image information. A transmitting circuit can be set to excite the ultrasonic transmitter to work, and the signal collected by the receiving transducer can be digitally processed. The corresponding receiving and collecting circuit can realize high-precision digitized signals. The receiving and collecting circuit needs to realize: preamplification, filtering, automatic gain adjustment, ADC collection, etc. The specific data processing and the circuits involved belong to the prior art and will not be repeated here.

[0053] In some embodiments, the fracturing assembly 2 also includes a diverter pipe 22 and a one-way valve 23. The diverter pipe 22 has a first channel and a second channel. One end of the first channel is connected to the fracturing source, and the other end of the first channel passes through the driving component 42 and the side wall of the collecting cylinder 31 to communicate with the isolation space 13. The one-way valve 23 is arranged in the first channel, and the second channel is used to pass a cable. One end of the cable is suitable for being connected to a ground cable, and the other end of the cable is connected to the imaging component 32.

[0054] Specifically, Figure 4-Figure 6 As shown, the upper end of the first channel is connected to the fracturing source and is isolated from the fracturing connecting pipe 24 and the cavity 111 of the first packer 11, that is, the first channel is not connected to the fracturing pipe 21 and the cavity 111, and the lower end of the first channel passes through the driving component 42 and the side wall of the collecting cylinder 31 to communicate with the isolation space 13, so as to transport the fracturing fluid to the outside of the collecting cylinder 31. By setting the fracturing hole 212 at the upper end of the isolation space 13 and setting the second channel outlet at the lower end of the isolation space 13, the fracturing fluid flows out at the upper and lower ends of the isolation space 13 at the same time, thereby improving the fracturing efficiency. The second channel is used to pass the cable, the upper end of the cable is connected to the ground cable, and the lower end of the cable is connected to the imaging component 32 to provide power support and signal transmission for the imaging component 32.

[0055] like Figure 8As shown, the one-way valve 23 includes a valve body 231, a compression spring 232 and a valve ball 233. The valve body 231 has a water outlet channel 2311. The diameter of the valve ball 233 is slightly smaller than that of the water outlet channel 2311, so that the valve ball 233 can slide smoothly in the water outlet channel 2311. The inner wall surface of the water outlet channel 2311 includes a first block 23111 and a second block 23112 arranged at intervals in the up-down direction. The compression spring 232 and the valve ball 233 are installed between the first block 23111 and the second block 23112. When the pressure reaches a level sufficient to push the valve ball 233 open, the compression spring 232 is compressed, and the fracturing fluid can flow out from the water outlet end of the water outlet channel 2311. When the pressure is less than the elastic potential energy of the compression spring 232, the fracturing fluid cannot flow out from the water outlet end of the water outlet channel 2311.

[0056] When the fracturing fluid fully fills the isolation space 13, under the action of the fracturing fluid in the isolation space 13, the elastic potential energy provided by the compression spring 232 presses the valve ball 233 tightly against the second barrier 23112, so that the water flow cannot flow back from the water outlet into the first channel, ensuring that the fracturing fluid in the isolation space 13 will not flow back through the water outlet, and ensuring that the pressure in the fracturing area is stable during fracturing, providing a pressure maintenance function for the implementation of hydraulic fracturing operations.

[0057] In some embodiments, the driving component 42 includes a driver 421 and a telescopic rod 422, the driver 421 is connected to the telescopic rod 422, the telescopic rod 422 is connected to the collecting tube 31, and the first control component 4 also includes a wire taking-up box 43, the wire taking-up box 43 is arranged below the telescopic rod 422, and the wire taking-up box 43 is used to take up and release the cables when the collecting tube 31 moves.

[0058] Specifically, Figure 6 As shown, the driver 421 can control the extension and retraction of the telescopic rod 422 and can also control the rotation of the driver 421. The telescopic rod 422 includes multiple sections of sealed steel pipes with different diameters and can be freely extended and retracted in the horizontal direction. When the telescopic rod 422 is in a retracted state, the collecting tube 31 is stored in the sleeve 41. When the telescopic rod 422 is in an extended state, the collecting tube 31 is released outside the sleeve 41. Here, storage and release refer to that most of the body of the collecting tube 31 is located inside or outside the sleeve 41.

[0059] Due to the extension and retraction of the telescopic rod 422, when the collecting tube 31 moves up and down, the cable transmitted in the second channel becomes long and short. By setting the wire taking-up box 43 to take up the wire when the collecting tube 31 moves upward and to release the wire when the collecting tube 31 moves downward, the wires can be avoided from getting entangled and adapt to the different states of the telescopic rod 422.

[0060] At least a portion of the shunt pipe 22 may be configured as a channel formed by a telescopic hose to facilitate the expansion and contraction of the telescopic rod 422 .

[0061] In some embodiments, the first control component 4 further includes a hydraulic storage device 44, which is connected to the driver 421 and is used to generate and store electricity when the fracturing fluid in the first channel passes through. Through the arrangement of the hydraulic storage device 44, electricity can be generated and stored when the fracturing fluid flows through the hydraulic storage device 44, thereby preventing the imaging component 32 from working normally when the cable is broken or other unexpected power outages occur.

[0062] Optionally, the driver 421 may be powered by a cable or by a hydraulic storage device 44 .

[0063] Optionally, the connecting rod 45, the hydraulic storage device 44, the driver 421 and the telescopic rod 422 are all provided with channels inside to facilitate the passage of the shunt tube 22, so that the first channel of the shunt tube 22 is connected to the fracturing source, and the lower end of the first channel passes through the connecting rod 45, the hydraulic storage device 44, the driver 421, the telescopic rod 422 and the side wall of the collecting cylinder 31 in turn, and the fracturing fluid is transported to the sealed space 13 outside the collecting cylinder 31.

[0064] In some embodiments, the integrated device for geostress measurement and movable imaging based on hydraulic fracturing also includes a second control component 5, the second control component 5 includes a mounting tube 51 and a hydraulic component 52, at least a portion of the collecting tube 31 is installed in the mounting tube 51 and can be moved in the up and down directions relative to the mounting tube 51, the hydraulic component 52 includes a first hydraulic rod 521, one end of the first hydraulic rod 521 is connected to the collecting tube 31, and the other end of the first hydraulic rod 521 is connected to the second packer 12.

[0065] Specifically, Figure 5-Figure 7 As shown, the upper and lower ends of the collecting cylinder 31 are provided with a water-blocking belt 313 and a blocking portion 314. The diameter of the blocking portion 314 is slightly larger than the diameter of the collecting cylinder 31. The water-blocking belt 313 is arranged on the outer peripheral surface of the collecting cylinder 31 to prevent the fracturing fluid in the isolation space 13 from entering the collecting cylinder 31 from the upper and lower ends of the collecting cylinder 31, and can also play a buffering effect during the movement of the collecting cylinder 31.

[0066] The upper end of the collecting tube 31 is connected to the sleeve 41. The upper end blocking portion 314 is arranged in the sleeve 41 to prevent the upper end of the collecting tube 31 from being separated from the sleeve 41. The lower end of the collecting tube 31 is connected to the mounting tube 51. The lower end blocking portion 314 is arranged in the collecting tube 31 to prevent the lower end of the collecting tube 31 from being separated from the mounting tube 51. At the same time, the setting of the blocking portion 314 can also limit the moving position of the collecting tube 31 in the up and down directions.

[0067] The first hydraulic rod 521 extends in the up-down direction, and the upper end of the first hydraulic rod 521 is connected to the lower end of the collecting cylinder 31 through a bearing, so as to facilitate the circumferential rotation of the collecting cylinder 31 relative to the first hydraulic rod 521. The lower end of the first hydraulic rod 521 is connected to the second packer 12. Through the setting of the first hydraulic rod 521, the position of the collecting cylinder 31 in the up-down direction can be further adjusted.

[0068] In this embodiment, the axial movement and circumferential rotation of the collecting tube 31 are controlled by the cooperation of the first control component 4 and the second control component 5, so that deep hole geostress measurement can be carried out quickly, conveniently and swiftly. Fracturing and imaging only require one downhole fracturing operation to complete the test of the magnitude and direction of the principal stress, and more azimuthal hole wall information can be obtained, which greatly improves the measurement efficiency. In addition, due to the movable ultrasonic imaging system and real-time dynamic imaging by camera, the imaging result is more accurate and reliable, thereby improving the accuracy of geostress detection.

[0069] In some embodiments, the hydraulic component 52 also includes a plurality of second hydraulic rods 522, and the plurality of second hydraulic rods 522 are divided into two groups in the up and down directions. Each group of second hydraulic rods 522 includes a plurality of second hydraulic rods 522 arranged at intervals in the circumferential direction of the first hydraulic rod 521. One end of the second hydraulic rod 522 is connected to the first hydraulic rod 521, and the other end of the second hydraulic rod 522 can be extended and retracted along the radial direction of the first hydraulic rod 521 and can abut against the inner wall surface of the mounting tube 51.

[0070] Specifically, Figure 9-10 As shown, the second hydraulic rod 522 extends radially along the first hydraulic rod 521, and there are eight second hydraulic rods 522. Each group of second hydraulic rods 522 includes four second hydraulic rods 522 that are evenly spaced in the circumferential direction of the first hydraulic rod 521. The up and down movement of the first hydraulic rod 521 drives the collecting cylinder 31 to move up and down. Through the extension and retraction of the second hydraulic rod 522, the second hydraulic rod 522 can be brought into contact with the inner wall surface of the mounting cylinder 51, thereby improving the supporting stability of the hydraulic component 52.

[0071] Optionally, when the second hydraulic rod 522 group at the lower end abuts against the inner wall surface of the mounting tube 51, the second hydraulic rod 522 group at the upper end is retracted and separated from the inner wall surface of the mounting tube 51, and then the first hydraulic rod 521 is controlled to move along its axial direction, and the telescopic rod 422 extends and retracts to cooperate with the axial movement of the first hydraulic rod 521.

[0072] Optionally, the cable passes through the collecting cylinder 31 and extends into the mounting cylinder 51 to control the state of the hydraulic component 52 .

[0073] In some embodiments, the hydraulic component 52 further includes a gasket 523 and a rotating ball 524 . The gasket 523 is disposed at the other end of the second hydraulic rod 522 , and the rotating ball 524 is disposed between the other end of the second hydraulic rod 522 and the gasket 523 .

[0074] Specifically, Figure 9-10 As shown, a gasket 523 is provided at the end of each second hydraulic rod 522, and the gasket 523 is connected to the end of the second hydraulic rod 522 through a rotating ball 524, so that the gasket 523 can move flexibly on the inner wall surface of the installation cylinder 51. The gasket 523 can increase the friction between the installation cylinder 51 and the second hydraulic rod 522. The movement of the plurality of second hydraulic rods 522 and the first hydraulic rod 521 is controlled by cables on the ground, so that the hydraulic component 52 is fully in contact with the installation cylinder 51 through the gasket 523, and operates together with the upper telescopic rod 422 to move the collection cylinder 31 axially and circumferentially.

[0075] In some embodiments, the second control assembly 5 further includes a telescopic platform 53 , one end of the telescopic platform 53 is connected to the second packer 12 , and the other end of the telescopic platform 53 is connected to the other end of the first hydraulic rod 521 .

[0076] Specifically, Figure 7 As shown, the lower end of the telescopic table 53 is connected to the second packer 12, and the upper end of the telescopic table 53 is connected to the lower end of the first hydraulic rod 521. A fixed table is also provided at the lower end of the telescopic table 53, and the connection between the telescopic table 53 and the second packer 12 is achieved through the fixed table. The setting of the telescopic table 53 can increase the space for the axial movement of the first hydraulic rod 521.

[0077] In some embodiments, the integrated device for ground stress measurement and movable imaging based on hydraulic fracturing method also includes a connector 6, the connector 6 includes a buffer portion 61 and an adapter 62, the buffer portion 61 includes a buffer sleeve 611 and a buffer spring 612, the buffer spring 612 is arranged in the buffer sleeve 611, one end of the buffer sleeve 611 is connected to the fracturing assembly 2, the other end of the buffer sleeve 611 is connected to the adapter 62, and the adapter 62 is connected to the sleeve 41.

[0078] Specifically, Fig.11 As shown, the connector 6 is used to connect the fracturing assembly 2 with the collection assembly 3, the buffer sleeve 611 is a rubber sleeve, and the buffer spring 612 is arranged in the rubber sleeve. The lower end of the buffer sleeve is connected to the adapter 62, and the adapter 62 and the collection barrel 31 are hinged to achieve circumferential rotation. When moving downward in the inclined hole, under the action of the buffer spring 612 and the hole wall of the inclined hole, the connector 6 can be tilted to one side and form an angle with the vertical plane.

[0079] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] It is to be understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A ground stress measurement and movable imaging integrated device based on hydraulic fracturing, characterized in that: include: A packer, the packer comprising a first packer and a second packer, the first packer and the second packer being arranged at intervals in a vertical direction to form a sealing space; A fracturing assembly, wherein the fracturing assembly comprises a fracturing pipe, the fracturing pipe is arranged in the isolation space and connected to the first packer, one end of the fracturing pipe is suitable for communicating with a fracturing source, the fracturing pipe has a fracturing cavity and a fracturing hole, the fracturing hole connects the fracturing cavity with the isolation space so that fracturing fluid enters the isolation space; A collecting assembly, the collecting assembly comprising a collecting tube and an imaging component, one end of the collecting tube is rotatably connected to the fracturing assembly so that the collecting tube can form an angle with a vertical plane, the other end of the collecting tube is movably connected to the second packer, and the collecting tube can move and rotate in the up and down directions relative to the fracturing assembly and the second packer, at least a part of the imaging component is arranged in the collecting tube, and the imaging component comprises an ultrasonic imaging part and / or a photographic imaging part, which is used to obtain traces of induced cracks in real time.

2. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 1, characterized in that: It also includes a first control component, which includes a sleeve and a driving component. The sleeve is rotatably connected to the fracturing component so that the sleeve can form an angle with a vertical plane. At least a portion of the collecting cylinder is located in the sleeve and is sealingly and slidingly connected to the sleeve. The driving component is disposed in the sleeve and is connected to the collecting cylinder so that the collecting cylinder can move in the up and down directions and can rotate around the up and down directions relative to the sleeve.

3. The integrated device for measuring ground stress and movable imaging based on hydraulic fracturing method according to claim 2, characterized in that: The ultrasonic imaging part includes an ultrasonic transmitting end and an ultrasonic receiving end, the ultrasonic transmitting end and the ultrasonic receiving end are arranged at intervals in the up and down directions, the ultrasonic transmitting end is arranged in the sleeve, and the ultrasonic receiving end is arranged in the collecting tube.

4. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 2, characterized in that: The fracturing assembly also includes a shunt pipe and a one-way valve. The shunt pipe has a first channel and a second channel. One end of the first channel is connected to the fracturing source, and the other end of the first channel passes through the driving component and the side wall of the collecting cylinder to communicate with the isolation space. The one-way valve is arranged in the first channel, and the second channel is used to pass a cable. One end of the cable is suitable for being connected to a ground cable, and the other end of the cable is connected to an imaging component.

5. The ground stress measurement and movable imaging integrated device based on hydraulic fracturing method according to claim 4, characterized in that: The driving component includes a driver and a telescopic rod, wherein the driver is connected to the telescopic rod, and the telescopic rod is connected to the collecting barrel. The first control assembly further includes a wire-receiving box, which is disposed below the telescopic rod and is used to retract and release the cables when the collecting cylinder moves; and / or, The first control component also includes a hydraulic accumulator connected to the driver and used for generating and storing electricity when the fracturing fluid in the first channel passes through.

6. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 4, characterized in that: It also includes a second control component, which includes a mounting cylinder and a hydraulic component. At least a portion of the collecting cylinder is installed in the mounting cylinder and can move in the up and down directions relative to the mounting cylinder. The hydraulic component includes a first hydraulic rod, one end of the first hydraulic rod is connected to the collecting cylinder, and the other end of the first hydraulic rod is connected to the second sealer.

7. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 6, characterized in that: The hydraulic component also includes a plurality of second hydraulic rods, which are divided into two groups in the up and down directions, each group of second hydraulic rods includes a plurality of second hydraulic rods arranged at intervals in the circumferential direction of the first hydraulic rod, one end of the second hydraulic rod is connected to the first hydraulic rod, and the other end of the second hydraulic rod can be extended and retracted along the radial direction of the first hydraulic rod and can abut against the inner wall surface of the mounting cylinder.

8. The ground stress measurement and movable imaging integrated device based on hydraulic fracturing method according to claim 7, characterized in that: The hydraulic component further comprises a gasket and a rotating ball. The gasket is arranged at the other end of the second hydraulic rod, and the rotating ball is arranged between the other end of the second hydraulic rod and the gasket.

9. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 8, characterized in that: The second control assembly further comprises a telescopic platform, one end of which is connected to the second packer, and the other end of which is connected to the other end of the first hydraulic rod.

10. The integrated device for measuring ground stress and imaging based on hydraulic fracturing according to claim 2, characterized in that: It also includes a connector, which includes a buffer part and an adapter. The buffer part includes a buffer sleeve and a buffer spring. The buffer spring is arranged in the buffer sleeve. One end of the buffer sleeve is connected to the fracturing assembly, and the other end of the buffer sleeve is connected to the adapter. The adapter is connected to the sleeve.

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