In-situ stress measurement and movable imaging integrated device based on hydraulic fracturing method

Abstract

The present application relates to the technical field of ground stress measurement, in particular to a ground stress measurement and movable imaging integrated device based on hydraulic fracturing method, the ground stress measurement and movable imaging integrated device based on hydraulic fracturing method comprises packer, fracturing assembly and collection assembly, the packer comprises first packer and second packer arranged at intervals to form a sealing space, the fracturing assembly comprises fracturing tube with fracturing cavity and fracturing hole communicating with the fracturing cavity and the sealing space, the collection assembly comprises collection cylinder and imaging component, the collection cylinder is connected with the fracturing assembly and the second packer, and the collection cylinder can move along the up-down direction and rotate around the up-down direction relative to the fracturing assembly, and the imaging component is arranged in the collection cylinder to acquire the trace of induced fracture in real time, the ground stress measurement and movable imaging integrated device based on hydraulic fracturing method of the present application can acquire clear induced fracture trace and improve the ground stress measurement accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of in-situ stress measurement, and particularly relates to an in-situ stress measurement and movable imaging integrated device based on a hydraulic fracturing method. BACKGROUND

[0002] The hydraulic fracturing method in-situ stress measurement is to seal a section of rock bare hole in a borehole, inject high-pressure liquid into the sealed section, make the hole wall fracturing section of rock mass to be broken to determine the in-situ stress size and direction. The hydraulic fracturing method has a relatively loose requirement on the environment, can measure the absolute stress state at a deeper place, and is the most direct measurement method. After the hole wall fracturing section of rock mass is subjected to hydraulic fracturing, two symmetric, perpendicular to the hole axis, and 180° parallel induced fractures are generated, the azimuth angle of the induced fractures represents the direction of the maximum horizontal principal stress, and obtaining the direction of the maximum horizontal principal stress is an important content of the hydraulic fracturing method in-situ stress measurement.

[0003] In the related art, the traces of the induced fractures are collected by the impression method, but in the borehole with a larger stress value, the stress for reopening the induced fractures is relatively large, the traces of the induced fractures are difficult to be clearly printed on the impression rubber cylinder, and the traces printed on the surface of the impression rubber cylinder are easily worn off by the hole wall in the process of hoisting the drill pipe, so that the extracted traces are not clear, and the in-situ stress measurement precision is low. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, the embodiments of the present application provide an in-situ stress measurement and movable imaging integrated device based on a hydraulic fracturing method, which can obtain clear induced fracture traces and improve the in-situ stress measurement precision.

[0005] The in-situ stress measurement and movable imaging integrated device based on hydraulic fracturing method comprises a packer, a fracturing assembly, and a collecting assembly.

[0006] The in-situ stress measurement and movable imaging integrated device based on hydraulic fracturing method can obtain clear induced fracture traces and improve the in-situ stress measurement accuracy.

[0007] In some embodiments, the in-situ stress measurement and movable imaging integrated device based on hydraulic fracturing method further comprises a first control assembly, the first control assembly comprises a sleeve and a driving component, the sleeve is rotatably connected with the fracturing assembly so that the sleeve can form an angle with the vertical plane, at least part of the collecting cylinder is located in the sleeve and is in sealed sliding connection with the sleeve, and the driving component is located in the sleeve and is connected with the collecting cylinder so that the collecting cylinder can move along the up-down direction and rotate around the up-down direction relative to the sleeve.

[0008] In some embodiments, the ultrasonic imaging part comprises an ultrasonic transmitting end and an ultrasonic receiving end, the ultrasonic transmitting end and the ultrasonic receiving end are arranged in the up-down direction, the ultrasonic transmitting end is located in the sleeve, and the ultrasonic receiving end is located in the collecting cylinder.

[0009] In some embodiments, the fracturing assembly further comprises 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 with the fracturing source, the other end of the first channel passes through the driving component and the side wall of the collecting cylinder and is connected with the packer space, the one-way valve is located in the first channel, the second channel is used for passing through a cable, one end of the cable is adapted to be connected with a ground cable, and the other end of the cable is connected with the imaging component.

[0010] In some embodiments, the driving component includes a driver and a telescopic rod, the driver being connected to the telescopic rod and the telescopic rod being connected to the collecting cylinder; the first control component further includes a take-up box disposed below the telescopic rod, the take-up box being used to take in and unload the cable when the collecting cylinder moves; and / or, the first control component further includes a hydraulic storage device, the hydraulic storage device being connected to the driver, for generating and storing electricity when fracturing fluid passes through the first channel.

[0011] In some embodiments, the integrated device for geostress measurement and movable imaging based on hydraulic fracturing further includes a second control component, the second control component including a mounting cylinder and a hydraulic component, at least a portion of the collecting cylinder being installed inside the mounting cylinder and movable in a vertical direction relative to the mounting cylinder, the hydraulic component including a first hydraulic rod, one end of the first hydraulic rod being connected to the collecting cylinder, and the other end of the first hydraulic rod being connected to the second packer.

[0012] In some embodiments, the hydraulic component further includes a plurality of second hydraulic rods, which are divided into two groups in the vertical direction. 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 extend and retract radially along the first hydraulic rod and 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, the gasket being disposed at the other end of the second hydraulic rod, and the rotating ball being disposed between the other end of the second hydraulic rod and the gasket.

[0014] In some embodiments, the second control component further includes 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.

[0015] In some embodiments, the geostress measurement and movable imaging integrated device based on hydraulic fracturing further includes a connector, the connector including a buffer part and an adapter, the buffer part including a buffer sleeve and a buffer spring, the buffer spring being disposed inside the buffer sleeve, one end of the buffer sleeve being connected to the fracturing assembly, the other end of the buffer sleeve being connected to the adapter, and the adapter being connected to the sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an integrated device for geostress measurement and mobile imaging based on the hydraulic fracturing method according to an embodiment of the present invention.

[0017] Figure 2This is a schematic diagram of the integrated device for geostress measurement and mobile imaging based on the hydraulic fracturing method according to an embodiment of the present invention in operation.

[0018] Figure 3 This is a schematic diagram of the integrated device for geostress measurement and movable imaging based on the hydraulic fracturing method in an inclined borehole, according to an embodiment of the present invention.

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

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

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

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

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

[0024] Figure 9 This is a schematic diagram of a hydraulic component according to an embodiment of the present invention.

[0025] Figure 10 This is a schematic diagram of different states of the hydraulic components according to an embodiment of the present invention.

[0026] Figure 11 This is a schematic diagram of the connector according to an embodiment of the present invention.

[0027] Figure label:

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

[0029] Fracturing assembly 2, fracturing tube 21, fracturing chamber 211, fracturing orifice 212, diversion tube 22

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

[0031] Collection component 3, collection tube 31, transparent window 311, sound-transparent window 312, water-resistant strip 313, blocking part 314, imaging component 32.

[0032] Ultrasonic imaging unit 321, ultrasonic transmitter 3211, ultrasonic receiver 3212, ultrasonic probe 32121, photographic imaging unit 322, camera 3221, pressure sensor 33.

[0033] first control assembly 4, sleeve 41, driving part 42, driver 421, telescopic rod 422, take-up box 43, hydraulic accumulator 44, connecting rod 45,

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

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

[0036] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are intended to explain the present application, and should not be understood as limiting the present application.

[0037] The water pressure fracturing method-based in-situ stress measurement and movable imaging integrated device of the embodiment of the present application comprises a packer 1, a fracturing assembly 2 and a collection assembly 3. The packer 1 comprises a first packer 11 and a second packer 12, and the first packer 11 and the second packer 12 are arranged in a spaced-apart manner in the up-down direction to form a packer space 13. The fracturing assembly 2 comprises a fracturing pipe 21, the fracturing pipe 21 is arranged in the packer space 13 and connected with the first packer 11, one end of the fracturing pipe 21 is adapted to communicate with a fracturing source, the fracturing pipe 21 has a fracturing cavity 211 and a fracturing hole 212, the fracturing hole 212 communicates the fracturing cavity 211 with the packer space 13 so that fracturing fluid enters the packer space 13. The collection assembly 3 comprises a collection cylinder 31 and an imaging part 32, one end of the collection cylinder 31 is rotatably connected with the fracturing assembly 2 so that the collection cylinder 31 can form an angle with a vertical plane, the other end of the collection cylinder 31 is movably connected with the second packer 12, and the collection cylinder 31 can move in the up-down direction and rotate about the up-down direction relative to the fracturing assembly 2 and the second packer 12, at least part of the imaging part 32 is arranged in the collection cylinder 31, and the imaging part 32 comprises an ultrasonic imaging part 321 and / or a photographic imaging part 322 for acquiring traces of induced cracks in real time.

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

[0039] As shown in Figure 4As shown, the fracturing assembly 2 further comprises a fracturing connecting pipe 24, at least part of the fracturing connecting pipe 24 is located in the isolation space 13, the first packer 11 has a cavity 111 isolated from the fracturing connecting pipe 24, an upper end of the fracturing connecting pipe 24 communicates with the fracturing source through the first packer 11, a lower end of the fracturing connecting pipe 24 communicates with an upper end of the fracturing pipe 21 to deliver fracturing fluid into the fracturing cavity 211, since the fracturing holes 212 communicate the fracturing cavity 211 with the isolation space 13, the fracturing fluid flows out of the fracturing cavity 211 into the isolation space 13 through the plurality of fracturing holes 212 to perform fracturing.

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

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

[0042] The camera imaging part comprises at least one camera 3221, the collecting cylinder 31 is provided with a transparent window 311 corresponding to the camera 3221, the camera 3221 is arranged towards the transparent window 311, facilitating the camera 3221 to shoot the hole wall. Optionally, the camera 3221 is two, the transparent window 311 is two, the two transparent windows 311 are symmetrically arranged in the radial direction of the collecting cylinder 31. For example, the camera 3221 can be installed on a cable, facilitating the control of the working state of the camera 3221.

[0043] The ultrasonic imaging part 321 comprises at least one ultrasonic probe 32121, the collecting cylinder 31 is provided with a sound-transmitting window 312 corresponding to the ultrasonic probe 32121, a detection direction of the ultrasonic probe 32121 is arranged towards the sound-transmitting window 312. Optionally, the ultrasonic probe 32121 is two, the sound-transmitting window 312 is two, the two sound-transmitting windows 312 are symmetrically arranged in the radial direction of the collecting cylinder 31, the sound-transmitting window 312 can block water and allow ultrasonic waves to pass through, and the material of the sound-transmitting window 312 is polytetrafluoroethylene.

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

[0045] Optionally, the collecting cylinder 31 can resist high-intensity water pressure, protecting the safety of the camera imaging part and the ultrasonic imaging part 321. An electromagnetic compass can be installed in the collecting cylinder 31 to record the orientation of the ultrasonic probe 32121, so as to know the orientation of the detected fissure.

[0046] In the water pressure fracturing measurement of ground stress experiment, a series of pressurization, pressure closing and pressure maintaining operations are performed on the fractured section to implement multiple cyclic fracturing, and finally a series of mechanical parameters required by a calculation formula are obtained by using the ground and underground water pressure measuring instruments to measure the ground stress size. Specifically, the stress field near the middle part of the section of the borehole subjected to pressurization in the hydraulic fracturing process is composed of two parts, which are the uniform pressure in the hole and the ground stress field (σ xx , σ yy , σ zz ), wherein σ xx , σ yy are the horizontal stresses of the rock stratum; and σ zz is the vertical principal stress of the rock stratum. During the hydraulic fracturing process, when the fractured section is closed, σ xx is approximately equal to the pressure of the ground cover layer. According to the assumption that the fracture propagates along the path of minimum 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); the vertical principal stress σ zz can be obtained by σ v = γd (2), wherein γ is the rock bulk density; and d is the depth of the measured hole section from the ground surface. According to the theory of elasticity, the following formula P b -P0 = T0 + 3σ min -σ max -2P0 (3) can be derived. The compressive stress is taken as a positive value. P 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, and σ max is the maximum horizontal principal stress. The tensile strength of the rock can be obtained by processing a rock sample at a corresponding 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 tensile strength of the rock. After T0, P s , P b and P0 are measured, the maximum horizontal principal stress can be calculated by equation (3), that is, σ max = T0 + 3P s -P b -P0 (4)

[0047] This invention, through the installation of a collection component 3 connected to the fracturing component 2 within the containment space 13, allows the collection cylinder 31 to move vertically and rotate around the fracturing component 2 and the second packer 12. This enables the imaging component 32 within the collection cylinder 31 to move upwards or downwards within the containment space 13 to obtain borehole wall information at different heights. Simultaneously, the imaging component 32 can rotate within the containment space 13 to obtain borehole wall information from different orientations. The fracturing component 2 induces hydraulic fracturing of the borehole wall, and the collection component performs real-time imaging of the borehole wall information. Fracturing and imaging can be completed in a single well fracturing operation to test the magnitude and direction of the principal stress, significantly improving measurement efficiency. Furthermore, since the imaging component 32 is movable and rotatable within the containment space 13, it facilitates dynamic imaging of the borehole wall within the containment space 13, obtaining clear traces of induced fractures. The imaging results are more accurate and reliable, thereby improving the accuracy of geostress measurement.

[0048] In some embodiments, the geostress measurement and movable imaging integrated device based on hydraulic fracturing further includes a first control component 4. The first control component 4 includes a sleeve 41 and a drive 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 cylinder 31 is located inside the sleeve 41 and is slidably connected to the sleeve 41 in a sealed manner. The drive component 42 is disposed inside the sleeve 41 and connected to the collecting cylinder 31 so that the collecting cylinder 31 can move in the vertical direction and rotate about the vertical direction relative to the sleeve 41.

[0049] Specifically, such as Figure 6 As shown, the upper end of the sleeve 41 is connected to the fracturing assembly 2, and the lower end of the sleeve 41 is fitted onto the collecting cylinder 31. The driving component 42 is located inside the sleeve 41 and connected to the upper end of the collecting cylinder 31. The collecting cylinder 31 can be moved in the vertical direction and rotated around the vertical direction by the driving component 42, which facilitates the adjustment of the position and orientation of the imaging component 32 and obtains clear fracture traces.

[0050] Optionally, a connecting rod 45 is also provided inside the sleeve 41. The upper end of the connecting rod 45 passes through the sleeve 41 and is connected to the upper 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, such as Figures 1-3As shown, the ultrasonic imaging part 321 comprises an ultrasonic wave transmitting end 3211 and an ultrasonic wave receiving end 3212, which are arranged in a vertical direction, and the ultrasonic wave transmitting end 3211 is arranged in the sleeve 41, and the ultrasonic wave receiving end 3212 is arranged in the collecting cylinder 31. By arranging the ultrasonic wave transmitting end 3211 and the ultrasonic wave receiving end 3212 at different heights, it can be ensured that the ultrasonic wave receiving end 3212 can receive the ultrasonic wave signal emitted by the ultrasonic wave transmitting end 3211, and the propagation path of the ultrasonic wave signal during measurement is relatively stable, thereby improving the measurement accuracy.

[0052] Optionally, the ultrasonic imaging part 321 further comprises an ultrasonic signal processing circuit configured to convert the ultrasonic signal into image information. The transmitting circuit can be arranged to excite the ultrasonic wave 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 digital signal. The receiving and collecting circuit needs to realize preamplification, filtering, automatic gain adjustment, ADC collection, etc. The specific digital processing and the related circuit belong to the prior art, and will not be described here.

[0053] In some embodiments, the fracturing assembly 2 further comprises a shunt pipe 22 and a one-way valve 23. The shunt pipe 22 has a first channel and a second channel. One end of the first channel is in communication with the fracturing source, and the other end of the first channel is in communication with the sealing space 13 through the side wall surface of the driving part 42 and the collecting cylinder 31. The one-way valve 23 is arranged in the first channel. The second channel is used for passing through the cable. One end of the cable is adapted to be connected with the ground cable, and the other end of the cable is connected with the imaging part 32.

[0054] Specifically, as shown in Figures 4-6 The upper end of the first channel is in communication with the fracturing source and is isolated from the cavity 111 of the first packer 11, that is, the first channel is not in communication with the fracturing pipe 21 and the cavity 111. The lower end of the first channel is in communication with the sealing space 13 through the side wall surface of the driving part 42 and the collecting cylinder 31, so as to deliver the fracturing fluid to the outside of the collecting cylinder 31. By arranging the fracturing hole 212 at the upper end of the sealing space 13 and the second channel outlet at the lower end of the sealing space 13, the fracturing fluid can flow out at the upper end and the lower end of the sealing space 13 at the same time, thereby improving the fracturing efficiency. The second channel is used for passing through the cable. The upper end of the cable is connected with the ground cable, and the lower end of the cable is connected with the imaging part 32 to provide power support and signal transmission for the imaging part 32.

[0055] As shown in 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, facilitating smooth sliding of the valve ball 233 within the water outlet channel 2311. The inner wall of the water outlet channel 2311 includes a first stop 23111 and a second stop 23112 arranged at intervals in the vertical direction. The compression spring 232 and the valve ball 233 are installed between the first stop 23111 and the second stop 23112. When the pressure reaches a level sufficient to open the valve ball 233, the compression spring 232 is compressed, and 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, the elastic potential energy provided by the compression spring 232 under the action of the fracturing fluid in the isolation space 13 will press the valve ball 233 tightly against the second block 23112, so that the water flow cannot flow back into the first channel from the outlet end, ensuring that the fracturing fluid in the isolation space 13 will not flow back through the outlet end, and also ensuring that the pressure in the fracturing area is stable during fracturing, providing a pressure-maintaining function for the implementation of hydraulic fracturing operations.

[0057] In some embodiments, the drive component 42 includes a driver 421 and a telescopic rod 422. The driver 421 is connected to the telescopic rod 422, and the telescopic rod 422 is connected to the collecting cylinder 31. The first control component 4 also includes a take-up box 43, which is located below the telescopic rod 422 and is used to take up and untie the cable when the collecting cylinder 31 moves.

[0058] Specifically, such as Figure 6 As shown, the actuator 421 can control the extension and retraction of the telescopic rod 422, and can also control the rotation of the actuator 421. The telescopic rod 422 is composed of multiple sections of sealed steel pipes with different diameters, and can freely extend and retract in the horizontal direction. When the telescopic rod 422 is in the retracted state, the collecting cylinder 31 is stored inside the sleeve 41. When the telescopic rod 422 is in the extended state, the collecting cylinder 31 is released outside the sleeve 41. Here, storage and release mean that most of the cylinder body of the collecting cylinder 31 is located inside or outside the sleeve 41.

[0059] As the telescopic rod 422 extends and retracts, the cable length of the second channel varies as the collecting cylinder 31 moves up and down. By setting up a cable take-up box 43 to take up the cable when the collecting cylinder 31 moves upward and to release the cable when the collecting cylinder 31 moves downward, cable tangling is avoided and the system adapts to different states of the telescopic rod 422.

[0060] At least a portion of the diversion pipe 22 may be configured as a channel formed by a retractable flexible hose to accommodate the extension and retraction of the telescopic rod 422.

[0061] In some embodiments, the first control assembly 4 further comprises a hydraulic power storage device 44 connected to the driver 421 for generating power and storing when the fracturing fluid in the first channel passes. Through the arrangement of the hydraulic power storage device 44, power generation and storage can be carried out when the fracturing fluid flows through the hydraulic power storage device 44, avoiding the occurrence of power failure of the imaging component 32 when the cable is broken or other accidents occur.

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

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

[0064] In some embodiments, the in-situ stress measurement and movable imaging integrated device based on the hydraulic fracturing method further comprises a second control assembly 5, the second control assembly 5 comprising a mounting cylinder 51 and a hydraulic component 52, at least part of the collection cylinder 31 is mounted in the mounting cylinder 51 and is movable in the up-down direction relative to the mounting cylinder 51, and the hydraulic component 52 comprises a first hydraulic rod 521, one end of the first hydraulic rod 521 is connected to the collection cylinder 31, and the other end of the first hydraulic rod 521 is connected to the second packer 12.

[0065] Specifically, as shown in Figures 5-7 The upper end and the lower end of the collection cylinder 31 are provided with a water barrier 313 and a blocking part 314, the diameter of the blocking part 314 is slightly larger than the diameter of the collection cylinder 31, and the water barrier 313 is arranged on the outer circumferential surface of the collection cylinder 31 to prevent the fracturing fluid in the sealing space 13 from entering the collection cylinder 31 from the upper and lower ends of the collection cylinder 31, and also to play a buffering effect during the movement of the collection cylinder 31.

[0066] The upper end of the collection cylinder 31 is connected to the sleeve 41, and the upper end blocking part 314 is arranged in the sleeve 41 to prevent the upper end of the collection cylinder 31 from being separated from the sleeve 41, and the lower end of the collection cylinder 31 is connected to the mounting cylinder 51, and the lower end blocking part 314 is arranged in the collection cylinder 31 to prevent the lower end of the collection cylinder 31 from being separated from the mounting cylinder 51, and the arrangement of the blocking part 314 can also limit the movement position of the collection cylinder 31 in the up-down direction.

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

[0068] In the embodiment, the axial movement and the circumferential rotation of the collecting cylinder 31 are controlled through the cooperation of the first control assembly 4 and the second control assembly 5, so that the deep hole stress measurement can be quickly and conveniently completed, the fracturing and imaging can be completed through only one downhole fracturing operation, the test of the main stress size and direction can be completed, more azimuth hole wall information can be obtained, the measurement efficiency is greatly improved, and the imaging result is more accurate and reliable due to the movable ultrasonic imaging system and the real-time dynamic imaging of the camera, so that the accuracy of the ground stress detection is improved.

[0069] In some embodiments, the hydraulic component 52 further includes a plurality of second hydraulic rods 522, the plurality of second hydraulic rods 522 are divided into two groups in the up-down direction, 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 with the first hydraulic rod 521, and the other end of the second hydraulic rod 522 can be telescopic along the radial direction of the first hydraulic rod 521 and can abut against the inner wall surface of the mounting cylinder 51.

[0070] Specifically, as shown in Figures 9-10 The second hydraulic rod 522 extends in the radial direction of the first hydraulic rod 521, there are eight second hydraulic rods 522, each group of second hydraulic rods 522 includes four second hydraulic rods 522 arranged at intervals in the circumferential direction of the first hydraulic rod 521, the up-down movement of the collecting cylinder 31 is driven by the up-down movement of the first hydraulic rod 521, and the second hydraulic rod 522 can abut against the inner wall surface of the mounting cylinder 51 through the telescopic movement of the second hydraulic rod 522, so that the support stability of the hydraulic component 52 is improved.

[0071] Optionally, when the lower end group of second hydraulic rods 522 abuts against the inner wall surface of the mounting cylinder 51, the upper end group of second hydraulic rods 522 is retracted to be separated from the inner wall surface of the mounting cylinder 51, and then the first hydraulic rod 521 is controlled to move in the axial direction, and the telescopic rod 422 is extended and retracted 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 arranged at the other end of the second hydraulic rod 522, and the rotating ball 524 is arranged between the other end of the second hydraulic rod 522 and the gasket 523.

[0074] Specifically, such as Figures 9-10 As shown, a washer 523 is provided at the end of each second hydraulic rod 522. The washer 523 is connected to the end of the second hydraulic rod 522 via a ball joint 524, allowing the washer 523 to move flexibly on the inner wall of the mounting cylinder 51. The washer 523 increases the friction between the mounting cylinder 51 and the second hydraulic rod 522. The movement of multiple second hydraulic rods 522 and the first hydraulic rod 521 is controlled by cables on the ground, so that the hydraulic component 52 is in full contact with the mounting cylinder 51 through the washer 523 and works together with the upper telescopic rod 422 to move the collecting cylinder 31 axially and circumferentially.

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

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

[0077] In some embodiments, the geostress measurement and movable imaging integrated device based on hydraulic fracturing further includes a connector 6. The connector 6 includes a buffer part 61 and an adapter 62. The buffer part 61 includes a buffer sleeve 611 and a buffer spring 612. The buffer spring 612 is disposed inside the buffer sleeve 611. One end of the buffer sleeve 611 is connected to the fracturing assembly 2, and the other end of the buffer sleeve 611 is connected to the adapter 62. The adapter 62 is connected to the sleeve 41.

[0078] Specifically, such as Figure 11 As shown, connector 6 is used to connect fracturing assembly 2 and collecting assembly 3. Buffer sleeve 611 is a rubber outer sleeve, and buffer spring 612 is located inside the rubber outer sleeve. The lower end of the buffer sleeve is connected to adapter 62, which is hinged to collecting cylinder 31, allowing for circumferential rotation. When moving downwards in the inclined hole, under the action of buffer spring 612 and the hole wall, connector 6 can tilt to one side, forming an angle with the vertical plane.

[0079] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0080] In addition, the terms "first", "second", "third", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0081] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0082] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the first feature is lower in horizontal height than the second feature.

[0083] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. Exemplary expressions of the above terms do not necessarily refer to the same embodiment or example in this specification. Also, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in this specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction, if possible.

[0084] It can be understood that the above embodiments are exemplary and cannot be understood as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A mobile imaging integrated device for measuring geostress based on hydraulic fracturing, characterized in that, include: A packer, comprising a first packer and a second packer, wherein the first packer and the second packer are arranged at intervals in the vertical direction to form a sealing space; A fracturing assembly, the fracturing assembly including a fracturing tube disposed within the containment space and connected to the first packer, one end of the fracturing tube being adapted to communicate with a fracturing source, the fracturing tube having a fracturing cavity and a fracturing orifice, the fracturing orifice communicating the fracturing cavity with the containment space so that fracturing fluid enters the containment space; A collection assembly includes a collection cylinder and an imaging component. One end of the collection cylinder is rotatably connected to the fracturing assembly so that the collection cylinder can form an angle with a vertical plane. The other end of the collection cylinder is movably connected to a second packer. The collection cylinder is movable in the vertical direction and rotatable about the vertical direction relative to the fracturing assembly and the second packer. At least a portion of the imaging component is disposed inside the collection cylinder. The imaging component includes an ultrasonic imaging unit and / or a photographic imaging unit for acquiring traces of induced fractures in real time. A first control assembly, comprising a sleeve and a drive component, wherein the sleeve is rotatably connected to the fracturing assembly such that the sleeve can form an angle with a vertical plane, at least a portion of the collecting cylinder is located inside the sleeve and is slidably connected to the sleeve in a sealed manner, and the drive component is disposed inside the sleeve and connected to the collecting cylinder such that the collecting cylinder can move in a vertical direction and rotate about a vertical direction relative to the sleeve. The driving component includes a driver and a telescopic rod, the driver being connected to the telescopic rod, and the telescopic rod being connected to the collecting cylinder. The first control component further includes a cable reel box, which is located below the telescopic rod and is used to reel in and unload the cable when the collecting cylinder moves; and / or, The first control component also includes a hydraulic storage device, which is connected to the driver and is used to generate electricity and store it when fracturing fluid passes through the first channel; The second control component includes an installation cylinder and a hydraulic component. At least a portion of the collection cylinder is installed inside the installation cylinder and is movable in a vertical direction relative to the installation cylinder. The hydraulic component includes a first hydraulic rod, one end of which is connected to the collection cylinder and the other end of which is connected to the second packer. The hydraulic component also includes a plurality of second hydraulic rods, which are divided into two groups in the vertical direction. 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 extend and retract radially along the first hydraulic rod and abut against the inner wall surface of the mounting cylinder. The hydraulic component further includes a gasket and a rotating ball, the gasket being disposed at the other end of the second hydraulic rod, and the rotating ball being disposed between the other end of the second hydraulic rod and the gasket; The second control component also includes 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.

2. The integrated device for geostress measurement and mobile imaging based on hydraulic fracturing as described in claim 1, characterized in that, The ultrasonic imaging unit includes an ultrasonic transmitter and an ultrasonic receiver, which are arranged at intervals in the vertical direction. The ultrasonic transmitter is located inside the sleeve, and the ultrasonic receiver is located inside the collecting cylinder.

3. The integrated device for geostress measurement and mobile imaging based on hydraulic fracturing as described in claim 2, characterized in that, The fracturing assembly also includes a diversion pipe and a one-way valve. The diversion 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 side wall of the drive component and the collection cylinder and is connected to the sealing space. The one-way valve is located in the first channel. The second channel is used to pass through a cable. One end of the cable is adapted to be connected to a ground cable, and the other end of the cable is connected to an imaging component.

4. The integrated device for geostress measurement and mobile imaging based on hydraulic fracturing as described in claim 1, 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 disposed inside 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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