Measurement system and method for obtaining surrounding rock characteristics based on well logging technology

Abstract

The invention relates to the technical field of geological exploration, and provides a measuring system and method for obtaining surrounding rock characteristics based on the well logging technology, and the measuring system comprises a hole sealing device, a hole sealing guide rod, a pushing device and a testing probe. The hole sealing device comprises a pipeline and an elastic shell arranged on the outer side of the pipeline in a sleeving mode, a water filling gap is formed between the pipeline and the elastic shell, and the elastic shell is used for abutting against the inner wall of a drill hole so as to seal the drill hole; the hole sealing guide rod is connected to the near end of the pipeline; the pushing device comprises at least one pushing guide rod, and a connecting joint is arranged at the far end of the pushing guide rod; and the test probe is hermetically connected to the connecting joint at the farthest end. The hole sealing device is placed in the drill hole, and an external water source is injected into the water filling gap between the elastic shell and the pipeline, so that the elastic shell abuts against the hole wall of the drill hole to seal the drill hole; and meanwhile, water flows into the drill hole, water injection of the drill hole is achieved, hole sealing and water injection of the drill hole are achieved, and the hole sealing device is pushed to the target depth in the drill hole through the hole sealing guide rod.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration technology, and in particular to a measurement system and method for obtaining surrounding rock characteristics based on well logging technology. Background Art

[0002] In geophysical exploration, a well logging instrument is a device commonly used in the field of geological exploration. It can detect the physical properties and chemical composition of underground materials and transmit the data to the ground for processing and analysis. It can be used to study the structure of the earth's crust, find mineral resources and groundwater, and monitor environmental changes. Common well logging instruments include sonic logging instruments, electrical logging instruments, and radioactive logging instruments. They each have different functions and application ranges, but they all exist to more accurately understand the underground situation.

[0003] The sonic logging instrument uses the propagation speed and time of sound waves in the medium to obtain formation information. Because the sound wave signal is easily affected by factors such as air density, temperature and pressure when propagating in the air, the measurement results are not accurate. In water, the propagation speed of sound waves is relatively fast and is less affected by environmental factors. Therefore, sonic logging in water can obtain more accurate formation information. Therefore, sonic logging instruments are usually used in a sealed water environment to ensure the accurate propagation of sound wave signals and the reliability of measurement results. In addition, the sealed water environment can also ensure that the measurement process will not be disturbed by external environmental factors, such as water flow, bubbles, etc. In short, when using the sonic logging instrument, it is necessary to measure in a sealed water environment to ensure the accuracy and reliability of the measurement results.

[0004] Well logging instruments are widely used in the oil industry. However, since oil well logging is used in vertically downward boreholes, it is only necessary to fill the borehole with liquid when the well logging instrument is measuring so that the sensor of the acoustic well logging instrument is in a liquid water environment. There is no problem of water sealing in the hole during the use of the instrument or sealing during the use of the equipment.

[0005] However, to use the sonic logging instrument in coal mine lanes or tunnels to measure the parameters of the surrounding rock mass lithology and structure, it is necessary to drill vertically, obliquely or horizontally in the roof or sides of the lane (or tunnel), and then place the sonic logging instrument in it and fill it with liquid. This requires considering the issue of sealing the hole and pushing the instrument probe (sensor) to the test depth. Therefore, the sealing and pushing depth of the sonic logging instrument used in the lane are important issues that need to be solved in the industry. Summary of the invention

[0006] The present invention provides a measurement system and method for obtaining surrounding rock characteristics based on well logging technology, which are used to solve at least one technical problem existing in the prior art.

[0007] The present invention provides a measurement system for obtaining surrounding rock characteristics based on well logging technology, comprising a sealing device, a sealing guide rod, a pushing device and a test probe; the sealing device comprises a pipeline and an elastic shell sleeved on the outer side of the pipeline, an assembly cavity with two ends opened is formed inside the pipeline along the axial direction, a water-filled gap is provided between the pipeline and the elastic shell, when water is injected into the water-filled gap under pressure, the elastic shell is used to abut against the inner wall of the borehole to seal the borehole, the pipeline has a drainage port, and water in the water-filled gap flows into the borehole from the drainage port; the sealing guide rod is connected to the proximal end of the pipeline; at least part of the pushing device is penetrated in the assembly cavity, the pushing device comprises at least one pushing guide rod, the pushing guide rod has a hollow cavity, the distal end of the pushing guide rod has a connecting joint, when the pushing guide rod is multiple, two adjacent pushing guide rods are detachably connected through the connecting joint; the test probe is sealed and connected to the connecting joint at the farthest end, and a cable connected to the test probe is accommodated in the hollow cavity and extends out of the pushing guide rod along the axial direction of the pushing guide rod.

[0008] According to the measurement system for obtaining surrounding rock characteristics based on logging technology provided by the present invention, the outer wall of the sealing guide rod has a first scale arranged axially and / or the outer wall of the pushing guide rod has a second scale arranged axially.

[0009] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, the two ends of the push guide rod have guide rod joints, the middle part of the guide rod joint has a flange, and the side surface of the end of the guide rod joint away from the push guide rod has at least one first limiting boss, and a joint limiting groove is formed between the first limiting boss and the flange; The connecting joint comprises a first connecting joint, wherein a connecting cavity is formed in the axial direction, and at least one second limiting boss is formed at both ends of the inner side wall of the connecting cavity; The guide rod joint can rotate relative to the first connecting joint and have a first rotation position and a second rotation position. In the first rotation position, the first limiting boss corresponds to the second limiting boss, and the first limiting boss can extend into the connecting cavity through the second limiting boss. In the second rotation position, the second limiting boss is limitedly clamped in the joint limiting groove, so that the first connecting joint and the guide rod joint are limitedly connected.

[0010] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, a threaded hole is opened on the side of the first connecting joint, a first top screw is arranged in the threaded hole, and the first top screw is connected to the guide rod joint.

[0011] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, the distal end of the push guide rod has a guide rod joint, the middle part of the guide rod joint has a flange, and the side surface of one end of the guide rod joint away from the push guide rod has at least one first limiting boss, and a joint limiting groove is formed between the first limiting boss and the flange; The connecting joint comprises a second connecting joint, the second connecting joint is provided with a connecting cavity along the axial direction, the proximal side wall of the connecting cavity is formed with at least one second limiting boss; the distal side wall of the connecting cavity has an internal thread connected to the proximal end of the test probe or the pushing guide rod; The guide rod joint can rotate relative to the second connecting joint and have a first rotation position and a second rotation position. In the first rotation position, the first limiting boss corresponds to the second limiting boss, and the first limiting boss can extend into the connecting cavity through the second limiting boss. In the second rotation position, the second limiting boss is limitedly clamped in the connecting joint limiting groove, so that the first connecting joint and the guide rod joint are limitedly connected.

[0012] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, the pushing guide rod includes a guide rod body and a fastening structure, and the guide rod body includes a first splicing unit and a second splicing unit; the fastening structure is connected to the first splicing unit and the second splicing unit, so that the first splicing unit and the second splicing unit are spliced ​​together to form the hollow cavity.

[0013] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, the sealing device also includes a switch component, the pipe wall of the pipe is provided with a water inlet, a pressure inlet and a pressure discharge port; a first flow channel and a second flow channel are formed in the pipe wall; the first flow channel and the second flow channel are arranged at intervals along the axial direction; the water inlet and the pressure inlet are both connected to the first flow channel, and the water outlet and the pressure discharge port are both connected to the second flow channel; the pressure inlet is connected to the water-filled gap and the first flow channel, and the pressure discharge port is connected to the water-filled gap and the second flow channel; A switch component is arranged at the drain outlet, and is used to open or block the drain outlet; when the water pressure in the water-filled gap is greater than the blocking force of the switch component on the drain outlet, the switch component opens the drain outlet, so that the water in the second flow channel flows from the drain outlet into the borehole.

[0014] The present invention also provides a measurement method for obtaining surrounding rock characteristics based on well logging technology, based on any one of the above-mentioned measurement systems for obtaining surrounding rock characteristics based on well logging technology, the method comprises the following steps: The sealing device is placed at a target depth in the borehole by means of a sealing guide rod, the assembly cavity of the sealing device is sealed and equipped with a pushing device, and a test probe extending out of the assembly cavity is installed at the far end of the pushing device; injecting water into the water-filled gap to expand the elastic shell until it abuts against the inner wall of the borehole, and at the same time filling the borehole with water through the drain port so that the test probe is in a liquid environment; Acquire rock formation data through test probes; Test surrounding rock properties are determined based on the formation data.

[0015] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, an acoustic wave pulse is generated by a measuring probe and propagated to the inner wall of the borehole; Receiving, by means of a measuring probe, a sound wave signal reflected back by the sound wave pulse after it propagates through the rock formation; The acoustic wave signal and the acoustic wave propagation time are determined as rock formation data; the acoustic wave propagation time is the time difference between the measurement probe generating the acoustic wave pulse and the measurement probe receiving the acoustic wave signal.

[0016] According to the measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention, gamma rays are generated by a measurement probe and propagated to the inner wall of the borehole; receiving, by means of a measuring probe, gamma ray data that is scattered back after the gamma ray propagates through the rock formation; The amount and intensity of the scattered gamma rays are determined as formation data.

[0017] The measuring system for obtaining surrounding rock characteristics based on logging technology provided by the present invention is placed in a borehole through a sealing device, and an external water source is injected into the water-filled gap between the elastic shell and the pipeline, so that the elastic shell abuts against the borehole wall to seal the borehole; at the same time, the water flows into the borehole through the drain port to achieve water injection into the borehole; in this way, the sealing device of the present invention can not only seal the borehole but also inject water into the borehole, and the sealing device can be pushed to the target depth in the borehole through the sealing guide rod. In addition, the present invention is provided with a pushing device through the assembly cavity of the sealing device, so that the test probe at the far end of the pushing device is in a liquid environment, and the cable of the test probe is accommodated in the hollow cavity of the pushing guide rod, and the cable extends out of the pushing guide rod along the axial direction of the hollow cavity, so that the cable is isolated from the water environment outside the pushing guide rod, thereby improving the waterproof ability of the cable, avoiding the influence of water on the test data, and improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention.

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of a measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention.

[0021] Figure 3 It is a schematic diagram of an application scenario of a measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention.

[0022] Figure 4 It is a structural schematic diagram of the pushing device provided by the present invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the structure of the AA section.

[0024] Figure 6 It is a structural schematic diagram of the first splicing unit of the pushing device provided by the present invention.

[0025] Figure 7 It is a structural schematic diagram of the second splicing unit of the pushing device provided by the present invention.

[0026] Figure 8 It is a structural schematic diagram of the fastening structure of the pushing device provided by the present invention.

[0027] Fig. 9 It is a structural schematic diagram of a guide rod joint of a pushing device provided by the present invention.

[0028] Fig.10 It is a schematic diagram of the assembly structure of the first connecting joint and the guide rod joint of the pushing device provided by the present invention.

[0029] Fig.11 yes Fig.10 Schematic diagram of the structure of the BB section.

[0030] Fig.12 It is a schematic diagram of the three-dimensional structure of the sealing device provided by the present invention.

[0031] Fig.13 It is a schematic cross-sectional structural diagram of the sealing device provided by the present invention.

[0032] Fig.14 yes Fig.13 Schematic diagram of the enlarged structure at point A in the middle.

[0033] Fig.15 yes Fig.13 Schematic diagram of the enlarged structure at point B in the middle.

[0034] Fig.16 It is a schematic diagram of the assembly structure of the elastic shell and the pipeline of the sealing device provided by the present invention.

[0035] Fig.17 It is a schematic diagram of the three-dimensional structure of the pipeline of the sealing device provided by the present invention.

[0036] Fig.18 It is a schematic diagram of the cross-sectional structure of a pipeline of the sealing device provided by the present invention.

[0037] Fig.19 yes Fig.18 Schematic diagram of the enlarged structure at point C in the middle.

[0038] Fig. 20 It is a flow chart of a measurement method for obtaining surrounding rock characteristics based on well logging technology provided by the present invention. DETAILED DESCRIPTION

[0039] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] Combine the following Figure 1-Figure 20 A measurement system for obtaining surrounding rock characteristics based on well logging technology according to an embodiment of the present invention is described.

[0041] The embodiment of the first aspect of the present invention provides a measurement system for obtaining surrounding rock characteristics based on well logging technology, such as Figure 1 , Figure 2 , Figure 4 , Fig.12 and Fig.13 As shown, the measurement system for obtaining surrounding rock characteristics based on well logging technology includes a sealing device 10 , a sealing guide rod 30 , a pushing device 20 and a test probe 610 .

[0042] Among them, the sealing device 10 includes a pipe 100 and an elastic shell 200 sleeved on the outside of the pipe 100. An assembly cavity 101 with two ends opened is formed axially inside the pipe 100. A water-filled gap is provided between the pipe 100 and the elastic shell 200. When water is injected into the water-filled gap under pressure, the elastic shell 200 is used to abut against the inner wall of the borehole 50 to seal the borehole 50. The pipe 100 has a drain port 107, and the water in the water-filled gap flows into the borehole 50 from the drain port 107.

[0043] The sealing guide rod 30 is connected to the proximal end of the pipeline 100 .

[0044] The pushing device 20 is at least partially disposed in the assembly cavity 101, and includes at least one pushing guide rod 400, the pushing guide rod 400 has a hollow cavity 413, and the distal end of the pushing guide rod 400 has a connecting joint. When there are multiple pushing guide rods 400, two adjacent pushing guide rods 400 are detachably connected via the connecting joint.

[0045] The test probe 610 is sealed and connected to the farthest connection joint. The cable 620 of the test probe 610 is accommodated in the hollow cavity 413 and extends out of the push guide rod 400 along the axial direction of the push guide rod 400 .

[0046] It is understandable that the pushing device 20 can not only push the test probe 610 into the borehole 50 , but also seal the assembly cavity 101 , and cooperate with the sealing device 10 to create a sealed water environment for the test probe 610 .

[0047] It should be noted that the distal end refers to the end of the sealing device 10 that is farther away from the operator when the borehole 50 is sealed; the proximal end refers to the end of the sealing device 10 that is closer to the operator when the borehole 50 is sealed.

[0048] The measurement system for obtaining surrounding rock characteristics based on well logging technology provided by the present invention is characterized in that a sealing device 10 is placed in a borehole 50, and an external water source is injected into the water-filled gap between the elastic shell 200 and the pipeline 100, so that the elastic shell 200 abuts against the hole wall of the borehole 50 to seal the borehole 50; at the same time, the water flow also flows into the borehole 50 through the drain port 107 to realize water injection into the borehole 50; in this way, the sealing device 10 of the present invention can not only seal the borehole 50 but also inject water into the borehole 50, and the sealing device 10 can be pushed to the target depth in the borehole 50 through the sealing guide rod 30. In addition, the present invention passes the pushing device 20 through the assembly cavity 101 of the sealing device 10, so that the test probe 610 at the far end of the pushing device 20 is in a liquid environment, and the cable 620 connected to the test probe 610 is accommodated in the hollow cavity 413 of the pushing guide rod 400, and the cable 620 extends out of the pushing guide rod 400 along the axial direction of the hollow cavity 413. In this way, the cable 620 is isolated from the water environment outside the pushing guide rod 400, thereby improving the waterproof ability of the cable 620, avoiding the influence of water on the test data, and improving the accuracy of the test results.

[0049] In some embodiments, the outer wall of the sealing guide rod 30 has a first scale (not shown in the figure) arranged along the axial direction, and the first scale on the sealing guide rod 30 can indicate the depth of the sealing device 10 placed in the borehole 50. For example, the scale value of the first scale on the outer wall of the sealing guide rod 30 that is flush with the proximal end of the borehole 50 indicates the depth of the sealing device 10 placed in the borehole 50, so that the sealing device 10 can be placed at the target depth in the borehole 50 according to the scale value in the first scale.

[0050] Furthermore, the outer wall of the push guide rod 400 has a second scale (not shown in the figure) arranged in the axial direction. The push guide rod 400 passes through the assembly cavity 101 and the sealing guide rod 30 of the pipeline 100, so that the test probe 610 connected to the far end of the push guide rod 400 extends out of the assembly cavity 101 and is in a liquid environment. The second scale can indicate the depth of the test probe 610 extending out of the sealing device 10, so that the test probe 610 can reach the test depth in the borehole 50 more accurately. It should be noted that the test probe 610 can be moved along the depth direction of the borehole 50 by the push guide rod 400, and the specific moving distance can be determined by the second scale to achieve testing of rock formations at different depths.

[0051] like Figure 3 As shown, the borehole 50 of this embodiment is preferably a vertically upward borehole on the roof or two sides of the rock mass 60 of the tunnel 70 (or tunnel), an inclined upward borehole or a horizontal borehole. The tunnel 70 is provided with a test host 630, and the test host 630 and the test probe 610 are connected by a cable 620. The test host 630 obtains the rock formation data measured by the test probe 610, and the test host 630 determines the surrounding rock characteristics based on the rock formation data. It should be noted here that the test host 630, the test probe 610, and the cable 620 constitute a test instrument, and the test instrument includes but is not limited to an acoustic well logging instrument.

[0052] In some embodiments, Figure 4 , Figures 9 to 11 As shown, the connection joint includes a first connection joint 500 , and both ends of the pushing guide rod 400 have guide rod joints 415 , which are used to be plugged into the first connection joint 500 and are detachably connected to the first connection joint 500 .

[0053] It can be understood that the first connection joint 500 is detachably connected to the end of the push guide rod 400, and is used to connect the two push guide rods 400; the first connection joint 500 is provided with a connection cavity 510 along the axial direction, and the connection cavity 510 is communicated with the hollow cavity 413. By setting the first connection joint 500, the number of the push guide rods 400 can be increased or decreased according to the length of the cable, so that all the cables located below the water surface are wrapped in the hollow cavity 413, and the operability is improved. Among them, the connection cavity 510 is coaxially arranged with the hollow cavity 413.

[0054] Specifically, the middle part of the guide rod joint 415 has a flange 4151, and the side surface of the end of the guide rod joint 415 away from the push guide rod 400 has at least one first limiting boss 4155, and a joint limiting groove 4156 is formed between the first limiting boss 4155 and the flange 4151; the first connecting joint 500 is axially provided with a connecting cavity 510, and at least one second limiting boss 520 is formed at both ends of the inner wall of the connecting cavity 510; the guide rod joint 415 can rotate relative to the first connecting joint 500 and has a first rotation position and a second rotation position. In the first rotation position, the first limiting boss 4155 corresponds to the second limiting boss 520, and the first limiting boss 4155 can extend into the connecting cavity 510 through the second limiting boss 520. In the second rotation position, the second limiting boss 520 is limitedly clamped in the joint limiting groove 4156, so that the first connecting joint 500 and the guide rod joint 415 are limitedly connected. In order to avoid sliding against each other during use, a threaded hole is opened on the side of the first connecting joint 500, and a first top screw 530 is arranged in the threaded hole. The first top screw 530 is connected to the guide rod joint 415. By adjusting the depth of the first top screw 530 in the threaded hole, the guide rod joint 415 and the first connecting joint 500 are tightly connected.

[0055] Preferably, two second limiting bosses 520 are provided at one end of the first connection joint 500, and the two second limiting bosses 520 are symmetrically arranged to improve the stability of the limiting connection. Correspondingly, the guide rod joint 415 is formed with two symmetrically arranged joint limiting grooves 4156. After the guide rod joint 415 is inserted into the connection cavity 510 of the first connection joint 500, the first connection joint 500 is rotated 90° so that the two second limiting bosses 520 are limited in the two joint limiting grooves 4156.

[0056] In some embodiments, the distal end of the push guide rod 400 has a guide rod joint 415, and the connecting joint includes a second connecting joint. The guide rod joint 415 and one end of the second connecting joint are detachably connected using the above-mentioned plug-in method, and the other end of the second connecting joint is threadedly connected to another push guide rod 400 or a test probe 610. In order to improve the sealing performance, a sealing structure is set at the threaded connection position, and the sealing structure can use a sealing ring.

[0057] Specifically, the second connecting joint is provided with a connecting cavity 510 along the axial direction, and at least one second limiting boss 520 is formed on the proximal side wall of the connecting cavity 510; the distal side wall of the connecting cavity 510 has an internal thread connected to the proximal end of the test probe 610 or the pushing guide rod 400; the guide rod joint 415 can rotate relative to the second connecting joint and has a first rotation position and a second rotation position. In the first rotation position, the first limiting boss 4155 corresponds to the second limiting boss 520, and the first limiting boss 4155 can extend into the connecting cavity 510 through the second limiting boss 520. In the second rotation position, the second limiting boss 520 is limitedly clamped in the joint limiting groove 4156, so that the first connecting joint 500 is limitedly connected to the guide rod joint 415.

[0058] It should be noted that when there are multiple pushing guide rods 400, the connecting joint also includes a first connecting joint 500 and a second connecting joint. Two adjacent pushing guide rods 400 are detachably connected end to end through the first connecting joint 500, and the pushing guide rod 400 located at the farthest end and the test probe 610 are connected through the second connecting joint.

[0059] like Figures 4 to 11 As shown, the pushing guide rod 400 includes a guide rod body 410 and a fastening structure 420 .

[0060] The guide rod body 410 includes a first splicing unit 411 and a second splicing unit 412. The fastening structure 420 is connected to the first splicing unit 411 and the second splicing unit 412, so that the first splicing unit 411 and the second splicing unit 412 are spliced ​​together to form a guide rod body 410 having a hollow cavity 413 inside. The guide rod body 410 is used to connect with the test probe 610, and the hollow cavity 413 is used to accommodate the cable of the test probe 610 (i.e., the cable connected to the test probe 610), so that the cable extends out of the guide rod body 410 along the axial direction of the hollow cavity 413.

[0061] In this embodiment, by providing a fastening structure 420 connected to the first splicing unit 411 and the second splicing unit 412, the fastening structure 420 can connect the first splicing unit 411 and the second splicing unit 412 together, so that the first splicing unit 411 and the second splicing unit 412 are spliced ​​together to form a guide rod body 410 with a hollow cavity 413 inside. The cable of the test probe 610 can be accommodated in the hollow cavity 413, and the cable extends out of the guide rod body 410 along the axial direction of the hollow cavity 413. In this way, the guide rod body 410 can wrap the cable in the hollow cavity to isolate the cable from the water environment outside the guide rod body 410. The test probe 610 is pushed to the target depth to achieve cable sealing, thereby improving the waterproof ability of the cable, avoiding the influence of water on the test data, and improving the accuracy of the test results.

[0062] In addition, because the pushing device of this embodiment is connected to the test probe 610, the test probe 610 can also be pushed to the target test site by the pushing device, thereby achieving the purpose of fixed-point placement of the test probe 610 and further improving the accuracy of the test results.

[0063] It is understandable that the cable can be electrically connected to the test host 630 after passing through the guide rod body 410. The cable transmits the data collected by the test probe 610 to the test host 630, and the test host 630 can be used to store and / or process the received data.

[0064] It should be noted that the pushing device of this embodiment can be applied to the situation where the end of the cable away from the test probe 610 is not connected to the test host 630, and can also be applied to the situation where the end of the cable away from the test probe 610 is already connected to the test host 630. In this case, there is no need to remove the cable from the test host 630 to achieve the installation and protection of the cable.

[0065] A use process of the pushing device of this embodiment includes: separating the first splicing unit 411 and the second splicing unit 412, placing the cable on the side of the first splicing unit 411 facing the second splicing unit 412, and then using the fastening structure 420 to connect the second splicing unit 412 and the first splicing unit 411 together to form a guide rod body 410 with a hollow cavity 413 inside; then, connecting the test probe 610 to one end of the guide rod body 410 to close one end opening of the hollow cavity 413, and the other end of the guide rod body 410 can extend above the water surface, so that the hollow cavity 413 is completely closed, isolating the cable from water, improving the waterproof ability of the cable, and environmental adaptability, and improving the accuracy of the test results.

[0066] At present, for the test instruments such as sonic logging instruments that need to work in water environment, one end of the cable is connected to the probe of the test instrument, and the other end is connected to a data acquisition device such as a computer. Moreover, due to the different depths of the test rock formations, the length of the cable connected to it usually ranges from a few meters to tens of meters, or even hundreds of meters. If a pipe body with an integrated structure is used, it is necessary to manually insert the probe carrying the cable from one end of the pipe body and pass it out from the other end. This operation method is relatively easy to operate for shorter cables, but it is less easy to operate for longer cables, inefficient, and consumes a lot of manpower and time. The guide rod body 410 formed by the first splicing unit 411 and the second splicing unit 412 of this embodiment can avoid the pipe threading operation. Whether it is for shorter cables or longer cables, it is easy to operate and can greatly improve work efficiency.

[0067] like Figures 4 to 7As shown, in some embodiments, the first splicing unit 411 includes a first guide rod body 4111 and two first guide rod heads 4112; the two first guide rod heads 4112 are respectively connected to the two ends of the first guide rod body 4111; the second splicing unit 412 includes a second guide rod body 4121 and two second guide rod heads 4122; the two second guide rod heads 4122 are respectively connected to the two ends of the second guide rod body 4121; the fastening structure 420 is connected to the first guide rod body 4111 and the second guide rod body 4121, so that the first guide rod body 4111 and the second guide rod body 4121 are spliced, and the first guide rod head 4112 and the second guide rod head 4122 are spliced ​​to form a guide rod body 410. Specifically, the first guide rod body 4111 and the second guide rod body 4121 are spliced ​​to form a guide rod body 414 having a hollow cavity 413 inside, the first guide rod head 4112 and the second guide rod head 4122 are spliced ​​to form a guide rod joint 415 having a wire hole inside, the guide rod joint 415 is connected to the guide rod body 414, and the wire hole is connected to the hollow cavity 413. The guide rod joint 415 can be provided to connect the push guide rod 400 with the corresponding components. For example, two or more push guide rods 400 can be connected through the guide rod joint 415 to increase the length of the push device 20, thereby achieving the purpose of pushing the test instrument into the target test depth.

[0068] Furthermore, the wire hole is coaxially arranged with the hollow cavity 413 .

[0069] Furthermore, the guide rod body 414 is welded to the guide rod joint 415 . In other words, the first guide rod head 4112 is welded to the first guide rod body 4111 , and the second guide rod head 4122 is welded to the second guide rod body 4121 .

[0070] Specifically, the outer diameter of the guide rod joint 415 matches the inner diameter of the guide rod body 414 , and the guide rod joint 415 is inserted into the hollow cavity 413 of the guide rod body 414 and is welded to the guide rod body 414 .

[0071] Furthermore, the guide rod body 414 and the guide rod joint 415 may be made of different metal materials.

[0072] Exemplarily, the guide rod body 414 may be made of aluminum alloy to reduce the weight of the entire pushing device 20 ; the guide rod joint 415 may be made of steel to ensure welding strength.

[0073] like Figure 6 and Figure 7As shown, further, the push guide rod 400 also includes a sealing strip (not shown in the figure), which is arranged between the first splicing surface 4113 of the first guide rod body 4111 and the second splicing surface 4123 of the second guide rod body 4121. When the fastening structure 420 connects the first splicing unit 411 and the second splicing unit 412 together, the first guide rod body 4111 and the second guide rod body 4121 squeeze the sealing strip to ensure that the splicing of the guide rod body 410 has good sealing performance, thereby preventing water from entering the hollow cavity 413 from the splicing.

[0074] Preferably, a mounting groove is provided in the first joint surface 4113 or the second joint surface 4123 along the axial direction, and the sealing strip is arranged in the mounting groove.

[0075] like Fig. 9 As shown, further, radially, a flange 4151 is formed on the side of the guide rod joint 415; the flange 4151 divides the guide rod joint 415 into a first connecting section 4152 and a second connecting section 4153; the first connecting section 4152 is inserted into the hollow cavity 413, and is welded to the guide rod body 414; the second connecting section 4153 is used to be inserted into one end of the first connecting joint 500, and is detachably connected to the first connecting joint 500, and the other end of the first connecting joint 500 is used to be detachably connected to the first connecting section 4152 of the guide rod joint 415 of another pushing device.

[0076] Preferably, a first sealing ring 4154 is provided on one side of the flange 4151 facing the first connection joint 500, and the first sealing ring 4154 abuts against the first connection joint 500. In other words, when the second connection section 4153 is connected to the first connection joint 500, the first connection joint 500 squeezes the first sealing ring 4154 to improve the sealing performance.

[0077] like Figure 4 , Figure 5 , Fig.10 and Fig.11 As shown, further, the first connecting joint 500 is plugged into and matched with the pushing guide rod 400 to facilitate installation and disassembly. A threaded hole is opened on the side of the first connecting joint 500 along the radial direction of the hollow cavity 413, and a first top screw 530 is arranged in the threaded hole. The first top screw 530 is in contact with the side of the pushing guide rod 400 at one end thereof.

[0078] Specifically, the guide rod joint 415 is detachably connected to the first connecting joint 500, and the first top screw 530 abuts against the side of the guide rod joint 415 toward one end of the guide rod joint 415 to prevent the first connecting joint 500 and the pushing guide rod 400 from sliding against each other during use.

[0079] like Fig. 9As shown, specifically, the side of the guide rod joint 415 has a joint positioning hole 4157 , the joint positioning hole 4157 is located in the joint limiting groove 4156 , and the first top screw 530 is located in the joint positioning hole 4157 and abuts against the side of the guide rod joint 415 .

[0080] like Fig.10 and Fig.11 As shown, specifically, at least one second limiting boss 520 is formed at both ends of the inner wall of the first connecting joint 500, and a threaded hole is opened in the second limiting boss 520. After the guide rod joint 415 is inserted into the first connecting joint 500, the guide rod joint 415 is rotated or the first connecting joint 500 is rotated so that the second limiting boss 520 is limitedly clamped in the joint limiting groove 4156 of the guide rod joint 415, so that the first connecting joint 500 is limitedly connected with the guide rod joint 415.

[0081] In some embodiments of the present invention, the fastening structure 420 may be a throat hoop, but is not limited to a throat hoop. The first splicing unit 411 and the second splicing unit 412 are clamped together by the throat hoop to form the guide rod body 410.

[0082] like Figures 6 to 8 As shown, in some other embodiments of the present invention, the fastening structure 420 includes a limiting socket 421 , a locking plate 422 and a locking member 423 .

[0083] The limiting card seat 421 is connected to the first splicing unit 411; along the axial direction, the limiting card seat 421 is provided with a threading hole 4211, the threading hole 4211 is located in the hollow cavity 413, and is connected to the hollow cavity 413, and the threading hole 4211 has a wire passing port on the side facing the second splicing unit 412. When in use, the cable is put into the threading hole 4211 from the wire passing port, and the cable extends out of the guide rod body 410 along the threading hole 4211. The locking plate 422 is located in the threading hole 4211, and the locking plate 422 and the threading hole 4211 are axially slidably matched and radially limited. One end of the locking member 423 is connected to the locking plate 422, and the other end is connected to the second splicing unit 412. The locking member 423 is used to drive the locking plate 422 away from the first splicing unit 411 in the radial direction to squeeze the limiting card seat 421. Specifically, the limiting clamping seat 421 is connected to the first guide rod body 4111, and the other end of the locking member 423 is connected to the second guide rod body 4121. When in use, the locking member 423 can be used to keep the locking plate 422 away from the first splicing unit 411, because the locking plate 422 is also radially limited by the limiting clamping seat 421, and the limiting clamping seat 421 is connected to the first guide rod body 4111, so the locking plate 422 drives the first guide rod body 4111 to move radially toward the second guide rod body 4121 through the limiting clamping seat 421, so as to increase the fastening force between the first guide rod body 4111 and the second guide rod body 4121, so that the first splicing unit 411 and the second splicing unit 412 are spliced ​​to form the guide rod body 410.

[0084] Furthermore, the push guide rod 400 includes a plurality of fastening structures 420, which are arranged at intervals along the axial direction. By increasing the number of the fastening structures 420, the fastening force can be further increased, so that the fastening force is arranged as evenly as possible, thereby improving the sealing performance.

[0085] like Figure 5 and Figure 8 As shown, the locking member 423 includes a screw, and the locking plate 422 is fastened and connected to the second splicing unit 412 by the screw. Specifically, the locking plate 422 is fastened and connected to the second guide rod body 4121 by the screw. The structure is simple, the cost is reduced, and the operation is convenient.

[0086] like Figure 8 As shown, the fastening structure 420 also includes a cushion block 424; the cushion block 424 is located in the hollow cavity 413, and the second splicing unit 412, the cushion block 424 and the locking plate 422 are fastened and connected by screws. Specifically, the second guide rod body 4121, the cushion block 424 and the locking plate 422 are fastened and connected by screws. The cushion block 424 is provided to increase the stability and strength of the connection.

[0087] Preferably, the side surface of the pad 424 facing the second guide rod body 4121 is an arc surface, and the arc surface cooperates to play a role of limiting, so that the pad 424 is not easy to rotate, which is convenient for installation. At the same time, the arc surface structure increases the contact area between the pad 424 and the second guide rod body 4121, reduces the contact pressure, makes the pad 424 not easy to deform, enhances the strength of its contact structure, and increases the service life of the rod body.

[0088] Further, the first splicing unit 411 is provided with a first mounting hole (not shown in the figure), and the limit card seat 421 is arranged in the first mounting hole and connected to the hole wall of the first mounting hole. Specifically, the first guide rod body 4111 is provided with a first mounting hole, and the limit card seat 421 is arranged in the first mounting hole. By arranging the limit card seat 421 in the first mounting hole, the radial space occupied by the limit card seat 421 in the hollow cavity 413 can be reduced, so that more cables can be accommodated in the hollow cavity 413.

[0089] like Figure 8 As shown, further, the limiting clamp 421 includes a bottom plate 4212 and two side plates 4213; the two side plates 4213 are radially arranged on both sides of the bottom plate 4212, and the two side plates 4213 are folded toward each other on one side away from the bottom plate 4212 to form a flange 4214, and the two flanges 4214, the two side plates 4213 and the bottom plate 4212 are surrounded to form a threading hole 4211 with a wire passing opening on one side.

[0090] Preferably, a side surface of the bottom plate 4212 away from the side plate 4213 is an arc-shaped surface, and the arc-shaped surface is flush with the outer side surface of the first guide rod body 4111 .

[0091] like Figures 12 to 15 As shown, the sealing device 10 also includes a switch component 300; a water inlet 104, a water outlet 107, a pressure inlet 105 and a pressure discharge port 106 are opened on the pipe wall of the pipe 100; a first flow channel 102 and a second flow channel 103 are formed in the pipe wall; the first flow channel 102 and the second flow channel 103 are arranged at intervals along the axial direction of the pipe 100; the water inlet 104 and the pressure inlet 105 are both connected to the first flow channel 102, and the water outlet 107 and the pressure discharge port 106 are both connected to the second flow channel 103.

[0092] The elastic shell 200 has an expanded state and a contracted state; in the expanded state, the elastic shell 200 and the pipeline 100 form a water-filled gap, and the elastic shell 200 is used to abut against the inner wall of the drilled hole to seal the drilled hole; the pressure inlet 105 connects the water-filled gap and the first flow channel 102, and the pressure outlet 106 connects the water-filled gap and the second flow channel 103.

[0093] The switch component 300 is arranged at the drain outlet 107, and is used to open or block the drain outlet 107; when the water pressure in the water-filled gap is greater than the blocking force of the switch component 300 on the drain outlet 107, the switch component 300 opens the drain outlet 107, so that the water in the second flow channel 103 flows from the drain outlet 107 into the drill hole.

[0094] In this embodiment, by setting the pipeline 100, the elastic shell 200 and the switch component 300, when in use, the sealing device 10 is placed in the borehole, and the external water source is injected from the water inlet 104. The water flows through the first flow channel 102 and the pressure inlet 105 in sequence and flows into the water-filled gap between the elastic shell 200 and the pipeline 100, so that the elastic shell 200 changes from a contracted state to an expanded state. The elastic shell 200 in the expanded state can abut against the hole wall of the borehole to seal the borehole. At the same time, the water flows into the second flow channel 103 through the pressure discharge port 106, and flows into the drain port 107 to squeeze the switch component 300. When the water pressure in the water-filled gap, that is, the squeezing force of the water on the switch component 310 is greater than the blocking force of the switch component 300 on the drain port 107, the switch component 300 is squeezed open, and the drain port 107 is opened. At this time, water flows into the borehole from the drain port 107 to achieve water injection into the borehole.

[0095] When the injection of water into the water inlet 104 stops, the water in the sealing device 10 flows out from the water inlet 104, and the elastic shell 200 returns to the contracted state.

[0096] like Fig.13 and Fig.14 As shown, in this embodiment, the first flow channel 102 and the second flow channel 103 are arranged axially at intervals along the pipeline 100, which means that the distal end of the first flow channel 102 and the proximal end of the second flow channel 103 are divided in the middle, that is, the distal end of the first flow channel 102 is closed and the proximal end of the second flow channel 103 is closed.

[0097] like Fig.17 As shown, in some embodiments, a limiting groove 140 is formed on the outer side of the pipe 100 , and the elastic shell 200 is limited in the limiting groove 140 .

[0098] like Fig.17 , Fig.18 and Fig.19 As shown, in some embodiments, the pipeline 100 includes an inner tube 110 , a first outer tube 120 , and a second outer tube 130 .

[0099] Among them, the inner tube 110 is provided with an assembly cavity 101 with both ends opened in the axial direction; the first outer tube 120 is sleeved on the outer side of the inner tube 110, and a first flow channel 102 is formed between the first outer tube 120 and the inner tube 110; the tube wall of the first outer tube 120 is provided with a water inlet 104 and a pressure inlet 105. The second outer tube 130 is sleeved on the outer side of the inner tube 110, and is arranged in the axial direction with the first outer tube 120, and a second flow channel 103 is formed between the second outer tube 130 and the inner tube 110, and a pressure outlet 106 and a water outlet 107 are provided on the tube wall of the second outer tube 130. By providing the inner tube 110, a test instrument or the like can be sent into the borehole, and by providing the first outer tube 120 and the second outer tube 130, the first flow channel 102 and the second flow channel 103 can be formed conveniently. Compared with the solution of integrally forming the pipeline 100, the split structure of this embodiment is convenient for processing.

[0100] Specifically, the proximal end of the first outer tube 120 is welded to the inner tube 110, and the distal end of the first outer tube 120 is also welded to the inner tube 110, so that the first flow channel 102 is formed between the middle section of the first outer tube 120 and the inner tube 110. Preferably, the first flow channel 102 is an annular flow channel.

[0101] Specifically, the proximal end of the second outer tube 130 is welded to the inner tube 110, and the distal end of the second outer tube 130 is welded to the inner tube 110, so that the second flow channel 103 is formed between the middle section of the second outer tube 130 and the inner tube 110. Preferably, the second flow channel 103 is an annular flow channel.

[0102] In some implementations, the inner tube 110 includes multiple sections of tube bodies, which are detachably connected. When the distal tube body is blocked and damaged, the proximal tube body can be removed and the proximal tube body can continue to be used, thereby avoiding material waste and reducing costs.

[0103] Specifically, the inner tube 110 includes a first tube body 111 and a second tube body 112. The distal end of the outer side of the first tube body 111 has an internal thread, and the proximal end of the outer side of the second tube body 112 has an external thread. The first tube body 111 and the second tube body 112 are threadedly connected through external threads and internal threads.

[0104] Furthermore, in order to improve the sealing effect, a first sealing ring is provided at the distal end of the external thread. When the first tube body 111 and the second tube body 112 are threadedly connected together, the first tube body 111 squeezes the first sealing ring.

[0105] Specifically, a first limiting groove 121 is formed at the proximal end of the outer side surface of the first outer tube 120 , and the first limiting groove 121 is connected to the proximal end of the elastic shell 200 in a limiting and sealing manner.

[0106] Specifically, a third limiting protrusion 131 is formed on the outer side surface of the second outer tube 130 near the pressure discharge port 106 .

[0107] Specifically, a second limiting groove (not shown in the figure) is formed on the inner side wall of the second tube body 112, and a second sealing ring (not shown in the figure) is arranged in the second limiting groove. When the pushing device 20 is sealed and assembled in the assembly cavity 101, the outer side wall of the pushing device 20 squeezes the second sealing ring to improve the sealing effect.

[0108] In some embodiments, the proximal end of the elastic shell 200 is fixedly connected to the proximal end of the first outer tube 120, and the distal end of the elastic shell 200 is fixedly connected to the distal end of the second outer tube 130. Water enters the first flow channel 102 from the water inlet 104, and the water in the first flow channel 102 enters the water-filled gap between the elastic shell 200 and the pipeline 100 from the pressure inlet hole. The proximal end of the elastic shell 200 and the distal end of the elastic shell 200 are both fixed and unchanged, and the shell wall of the elastic shell 200 becomes thinner due to expansion.

[0109] In some other embodiments, the proximal end of the elastic shell 200 is fixedly connected to the proximal end of the first outer tube 120, and the distal end of the elastic shell 200 is axially slidably matched with the distal end of the second outer tube 130. When the water in the first flow channel 102 enters the water-filled gap between the elastic shell 200 and the pipeline 100 from the pressure inlet hole, the distal end of the elastic shell 200 moves toward the proximal end of the elastic shell 200, and the elastic shell 200 expands at the same time, and the elastic shell 200 appears to be shortened and expanded.

[0110] like Fig.16 As shown, further, the elastic housing 200 includes an elastic sleeve assembly 210 and a sealing ring 220. The elastic sleeve assembly 210 is sleeved on the outside of the pipeline 100, and the proximal end of the elastic sleeve assembly 210 near the water inlet 104 is connected to the pipeline 100; the elastic sleeve assembly 210 has an expanded state and a contracted state. The sealing ring 220 is sleeved on the outside of the pipeline 100; the distal end of the elastic sleeve assembly 210 away from the water inlet 104 is axially slidably matched with the pipeline 100 through the sealing ring 220. Specifically, the proximal end of the inner side wall of the elastic sleeve assembly 210 near the water inlet 104 is connected to the first outer tube 120, and the sealing ring 220 is sleeved on the distal end of the outer side surface of the second outer tube 130, and is axially slidably matched with the second outer tube 130; the outer side surface of the sealing ring 220 is connected to the distal end of the inner side wall of the elastic sleeve assembly 210 away from the water inlet 104. The water in the first flow channel 102 enters the water-filled gap between the elastic sleeve assembly 210 and the pipeline 100 through the pressure inlet 105, and the elastic sleeve assembly 210 changes from a contracted state to an expanded state. At the same time, the elastic sleeve assembly 210 pulls the sealing ring 220 to move the sealing ring 220 toward the water inlet 104.

[0111] like Fig.14 and Fig.19As shown, in some embodiments, a third limiting protrusion 131 is formed on the outer side of the pipe 100, and the third limiting protrusion 131 is located between the pressure discharge port 106 and the water discharge port 107, and is close to the pressure discharge port 106. The sealing ring 220 is limited by the third limiting protrusion 131, which limits the maximum moving distance of the sealing ring 220 and prevents the sealing ring 220 from blocking the pressure discharge port 106.

[0112] like Fig.16 As shown, further, the elastic sleeve assembly 210 includes an elastic sleeve 211 , a first fastener 212 and a second fastener 213 .

[0113] The elastic sleeve 211 is sleeved on the outside of the pipeline 100 and has an expanded state and a contracted state. The first fastener 212 is arranged at the proximal end of the elastic sleeve 211, and is used to connect the elastic sleeve 211 with the pipeline 100. The second fastener 213 is arranged at the distal end of the elastic sleeve 211, and is used to connect the elastic sleeve 211 with the sealing ring 220. The arrangement of the first fastener 212 and the second fastener 213 enables the proximal end and the distal end of the elastic sleeve 211 to be sealed with the pipeline 100.

[0114] Preferably, the first fastener 212 includes but is not limited to a clamp. Preferably, the second fastener 213 includes but is not limited to a clamp.

[0115] Furthermore, a third sealing ring 230 is provided between the sealing ring 220 and the pipeline 100. The third sealing ring 230 can not only improve the sealing performance between the sealing ring 220 and the pipeline 100, but also reduce the contact area between the sealing ring 220 and the pipeline 100, reduce the sliding friction resistance, and enable the sealing ring 220 to more smoothly drive the distal end of the elastic sleeve 211 to approach the proximal end when the elastic sleeve 211 expands.

[0116] like Fig.13 and Fig.15 As shown, in some embodiments, the switch component 300 includes a switch assembly 310 and a pressure regulating assembly 320. The switch assembly 310 is disposed at the drain port 107, and is used to open or block the drain port 107. The pressure regulating assembly 320 is connected to the switch assembly 310, and the pressure regulating assembly 320 has a blocking force, which is used to press the switch assembly 310 toward the drain port 107 to block the drain port 107; the pressure regulating assembly 320 can adjust the magnitude of the blocking force. Through the pressure regulating assembly 320, not only can the switch assembly 310 be pressed toward the drain port 107 to block the drain port 107, but also the maximum expansion degree of the elastic housing 200 can be adjusted by adjusting the magnitude of the blocking force, so as to be suitable for blocking drilled holes of different aperture sizes.

[0117] Furthermore, the switch assembly 310 includes a sealing member 311 and a sealing gasket 312; the sealing gasket 312 is arranged around the drain outlet 107, and the sealing member 311 is connected to the pressure regulating assembly 320; when the sealing member 311 blocks the drain outlet 107, the sealing member 311 squeezes the sealing gasket 312 to improve the sealing effect and prevent the drain outlet 107 from leaking.

[0118] Furthermore, the pressure regulating assembly 320 includes an elastic member 321 and a second top screw 322. The elastic member 321 is connected to the switch assembly 310. The second top screw 322 is threadedly matched with the pipe 100, and the second top screw 322 presses the switch assembly 310 toward the drain port 107 by squeezing the elastic member 321. By screwing the second top screw 322, the depth of the second top screw 322 entering the pipe 100 is changed, and the elastic deformation of the elastic member 321 can be adjusted, thereby changing the blocking force of the pressure regulating assembly 320. The structure is simple and the cost is low.

[0119] In some embodiments, the sealing guide rod 30 has a guide rod cavity therein, and the guide rod cavity is connected to the assembly cavity 101 of the pipeline 100; one end of the sealing guide rod 30 is detachably connected to the proximal end of the sealing device 10, and is used to push the sealing device 10 to the target depth in the borehole. The sealing guide rod 30 is connected to the sealing device 10, and the sealing device 10 is pushed to the target depth of the borehole by the sealing guide rod 30; then the pushing device 20 with the test probe 610 installed is sealed and assembled in the assembly cavity 101 of the sealing device 10, so that the test instrument enters the target depth of the borehole.

[0120] The embodiment of the second aspect of the present invention proposes a measurement method for obtaining surrounding rock characteristics based on well logging technology, such as Fig. 20 As shown, the measurement method includes the following steps 100 to 400.

[0121] Step 100 , the sealing device 10 is placed at the target depth in the borehole 50 through the sealing guide rod 30 , the assembly cavity 101 of the sealing device 10 is sealed with a pushing device 20 , and the far end of the pushing device 20 is installed with a test probe 610 extending out of the assembly cavity 101 .

[0122] The pushing device 20 equipped with the test probe 610 is sealed and assembled in the assembly cavity 101 of the sealing device 10 , and the sealing device 10 is placed at the target depth in the borehole 50 through the sealing guide rod 30 , so that the test probe 610 enters the target depth of the borehole 50 .

[0123] Specifically, a drilling rig is used to drill a borehole 50 of the required diameter and depth on the top plate or both sides of the tunnel 70 where the rock mass is to be tested. The borehole 50 can be a vertically upward borehole, an inclined upward borehole, or a horizontal borehole 50. The depth of the borehole 50 should exceed the depth of the desired test rock layer 60 position.

[0124] The test probe 610 of the test instrument is connected to the farthest end of the push guide rod 400, and the cable 620 connected to the test probe 610 is accommodated in the hollow cavity 413 of the push guide rod 400, and extends out of the push guide rod 400 along the axial direction of the push guide rod 400, and the other end of the cable 620 is connected to the test host 630 in the lane 70. It should be noted here that the cable 620 includes a signal transmission cable 620 and a data transmission cable 620.

[0125] The push guide rod 400 is sealed and assembled in the assembly cavity 101 of the sealing device 10, the water inlet 104 of the sealing device 10 is connected and fixed to one end of the water pipe, the other end of the water pipe is connected to the water pump 40, and a pressure gauge is connected between the water inlet 104 and the water pipe to test the water pressure; and a sealing guide rod 30 of a certain length is connected to the proximal end of the sealing device 10, so that the sealing device 10 can be pushed to the target depth of the borehole 50 through the sealing guide rod 30. It should be noted that the push guide rods 400 are connected in sequence head to tail according to the required test depth, until the push guide rod 400 sends the test probe 610 into the test rock formation position.

[0126] Step 200 , inject water into the water-filled gap to expand the elastic shell 200 until it abuts against the inner wall of the borehole 50 , and at the same time fill the borehole 50 with water through the drain port 107 so that the test probe 610 is in a liquid environment.

[0127] Specifically, the water source is turned on, and water flows into the first flow channel 102 from the water inlet 104, and then enters the water-filled gap between the elastic shell 200 and the pipeline 100 from the pressure inlet 105, so that the elastic shell 200 expands, and at the same time, the distal end of the elastic shell 200 moves toward the proximal end until the elastic shell 200 abuts against the wall of the borehole 50 to close the borehole 50.

[0128] When the water pressure in the water-filled gap is greater than the blocking force of the switch component 300 , the switch component 300 opens, and the water in the second flow channel 103 enters the borehole 50 from the drain port 107 , thereby injecting water into the borehole 50 and placing the test probe 610 in a sealed water environment.

[0129] Step 300 : Acquire rock formation data through the test probe 610 .

[0130] Specifically, the test host 630 sends a control instruction to the test probe 610 through the signal transmission cable 620, the test probe 610 is started based on the control instruction, the test probe 610 collects rock formation data related to geological rock information, and sends the rock formation data to the test host 630 through the data transmission cable 620.

[0131] Step 400: Determine test surrounding rock characteristics based on rock formation data.

[0132] It is understandable that the test host 630 may use a host computer, which processes the rock formation data to obtain the surrounding rock characteristics; the host computer may also control the memory to store the geological rock mass information.

[0133] Specifically, the stress state and structure of the rock formation are determined based on the rock formation data, and the stability of the surrounding rock is determined based on the stress state and structure.

[0134] Furthermore, step 300 may specifically be to use a test probe to perform acoustic logging, density logging and other methods to obtain various data of the rock formation; and the data may be stored in a computer or a data acquisition system, and statistics and analysis may be performed based on multiple rock formation data to determine the test surrounding rock characteristics.

[0135] In one embodiment of the present invention, step 300 is implemented by: A sound wave pulse is generated by a measuring probe and propagated to the inner wall of the borehole; a sound wave signal reflected back by the sound wave pulse after propagating through the rock formation is received by the measuring probe; the sound wave signal and the sound wave propagation time are determined as rock formation data; the sound wave propagation time is the time difference between the generation of the sound wave pulse by the measuring probe and the reception of the sound wave signal by the measuring probe.

[0136] Among them, the measuring probe includes an acoustic wave transmitter and a receiver. Acoustic logging obtains rock formation data through the propagation characteristics of acoustic waves in the formation. The specific process is as follows: Sound wave generation: After the test probe is lowered to the target depth in the borehole, high-frequency sound wave pulses are generated through the sonicator.

[0137] Acoustic wave propagation: High-frequency acoustic pulses propagate through the drilling fluid in the well to the well wall and then into the formation. The propagation speed of acoustic waves in different media (such as rock and fluid) is different.

[0138] Acoustic wave reception: After the acoustic wave propagates in the formation, part of the acoustic wave will be reflected back into the well and received by the receiver. Preferably, there are multiple receivers, which are spaced apart along the axial direction of the test probe to receive acoustic wave signals at different positions.

[0139] Data recording: The sound wave signal received by the receiver, including the arrival time, amplitude and frequency of the sound wave, is recorded. Among them, the propagation time of the sound wave is the time difference from the transmission of the high-frequency sound wave pulse to the reception.

[0140] Data analysis: The cable transmits the acoustic wave signal and acoustic wave propagation time acquired by the receiver to the test host 630, which is used to store and / or process the received data; the specific processing process is as follows: by analyzing the acoustic wave propagation time, the propagation speed of the acoustic wave in the formation (acoustic wave velocity) can be calculated, and the acoustic wave velocity is closely related to the physical properties of the formation (such as density, porosity, lithology, etc.); the propagation speed of the acoustic wave in dense rock is faster, and the propagation speed in loose or porous rock is slower. The density of the formation can be inferred by the acoustic wave velocity, and the density of dense rock is usually higher. The test host 630 obtains multiple acoustic wave velocities, and obtains acoustic wave waveforms based on the multiple acoustic wave velocities. By analyzing the received acoustic wave waveforms, other information of the formation is obtained, such as the stratification structure, cracks and faults of the formation.

[0141] It is understandable that acoustic wave measurement can provide stratigraphic information of the surrounding rock, help identify rock types, evaluate formation porosity and density, determine fluid properties, etc. These data have important application value for oil and gas exploration, geological research and engineering construction.

[0142] In another embodiment of the present invention, step 300 is implemented by: Gamma rays are generated by a measuring probe and propagated to the inner wall of the borehole; gamma ray data scattered back by the gamma rays after propagating in the rock formation are received by the measuring probe; the number and intensity of the scattered gamma rays are determined as rock formation data.

[0143] Among them, the measuring probe includes a gamma ray source and a gamma ray detector. Density logging obtains rock formation parameters by measuring formation density. Its main principle is to use the absorption and scattering characteristics of gamma rays in the formation. The specific process is as follows: Gamma ray generation: After the test probe is lowered to the target depth in the borehole, the gamma ray source emits high-energy gamma rays that penetrate the wellbore and formation. The gamma ray source emits cesium-137 or cobalt-60 rays.

[0144] Gamma ray detection: When gamma rays pass through the formation, part of them is absorbed by the formation and the other part is scattered; the gamma ray detector measures the number and intensity of the scattered gamma rays. There can be one or more gamma ray detectors.

[0145] Data recording: The gamma ray data recorded by the gamma ray detector, including the quantity and intensity of scattered gamma rays, is transmitted to the test host 630 on the ground.

[0146] Data analysis: The degree of absorption and scattering of gamma rays in the formation is related to the electron density of the formation, which is proportional to the overall density of the formation. The test host 630 can calculate the density of the formation by measuring the attenuation of the scattered gamma rays, thereby converting the detected scattered gamma ray data into a formation density value, so as to realize the calculation of the overall density of the formation from the gamma ray data. It should be noted here that due to the influence of the wellbore and drilling fluid, the measured density data needs to be corrected. For example, the size of the wellbore and the properties of the drilling fluid will affect the propagation of gamma rays, so environmental correction is required to ensure the accuracy of the data. It should be noted here that the scattered gamma ray data

[0147] Density curve: The final density data is displayed in the form of a density curve. The curve is distributed along the well depth, reflecting the density changes of the formation at different depths. It should be noted here that different types of rocks have different densities. Density logging can be used to identify the rock type in the formation, and density logging can reveal the stratification structure of the formation, such as the alternating layers of sandstone and shale.

[0148] It should be noted that density logging can be used in combination with other logging methods such as sonic logging and nuclear magnetic resonance logging to further accurately infer the porosity of the formation.

[0149] In some embodiments, the measuring method further includes: after the test is completed, stop injecting water into the water inlet 104. Drain the water in the sealing device 10, and the elastic shell 200 returns to the contracted state, and the distal end of the elastic shell 200 moves toward the drain port 107, so that the elastic shell 200 stretches. After the elastic shell 200 contracts to separate from the inner wall of the borehole 50, the sealing device 10 and the test probe 610 are removed from the borehole 50 to complete the test.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A measurement system for obtaining surrounding rock characteristics based on well logging technology, characterized in that: include: The sealing device comprises a pipe and an elastic shell sleeved on the outside of the pipe, wherein an assembly cavity with two ends opened is formed inside the pipe along the axial direction, a water-filled gap is provided between the pipe and the elastic shell, and when water is injected into the water-filled gap under pressure, the elastic shell is used to abut against the inner wall of the borehole to seal the borehole, and the pipe has a drain port, and water in the water-filled gap flows into the borehole from the drain port; A sealing guide rod connected to the proximal end of the pipeline; A pushing device, at least partially passing through the assembly cavity, comprising at least one pushing guide rod, the pushing guide rod having a hollow cavity, a distal end of the pushing guide rod having a connecting joint, and when there are multiple pushing guide rods, two adjacent pushing guide rods are detachably connected via the connecting joint; The test probe is sealed and connected to the connection joint at the farthest end. The cable connected to the test probe is accommodated in the hollow cavity and extends out of the push guide rod along the axial direction of the push guide rod.

2. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to claim 1, characterized in that: The outer wall of the sealing guide rod has a first scale arranged along the axial direction and / or the outer wall of the pushing guide rod has a second scale arranged along the axial direction.

3. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to claim 1, characterized in that: The two ends of the push guide rod are provided with guide rod joints, the middle part of the guide rod joint is provided with a flange, the side surface of one end of the guide rod joint away from the push guide rod is provided with at least one first limiting boss, and a joint limiting groove is formed between the first limiting boss and the flange; The connecting joint comprises a first connecting joint, wherein a connecting cavity is formed in the axial direction, and at least one second limiting boss is formed at both ends of the inner side wall of the connecting cavity; The guide rod joint can rotate relative to the first connecting joint and have a first rotation position and a second rotation position. In the first rotation position, the first limiting boss corresponds to the second limiting boss, and the first limiting boss can extend into the connecting cavity through the second limiting boss. In the second rotation position, the second limiting boss is limitedly clamped in the joint limiting groove, so that the first connecting joint and the guide rod joint are limitedly connected.

4. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to claim 3 is characterized in that: A threaded hole is provided on the side of the first connecting joint, a first top screw is arranged in the threaded hole, and the first top screw is connected to the guide rod joint.

5. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to claim 1, characterized in that: The distal end of the push guide rod has a guide rod joint, the middle part of the guide rod joint has a flange, the side surface of one end of the guide rod joint away from the push guide rod has at least one first limiting boss, and a joint limiting groove is formed between the first limiting boss and the flange; The connecting joint comprises a second connecting joint, the second connecting joint is provided with a connecting cavity along the axial direction, the proximal side wall of the connecting cavity is formed with at least one second limiting boss; the distal side wall of the connecting cavity has an internal thread connected to the proximal end of the test probe or the pushing guide rod; The guide rod joint can rotate relative to the second connecting joint and have a first rotation position and a second rotation position. In the first rotation position, the first limiting boss corresponds to the second limiting boss, and the first limiting boss can extend into the connecting cavity through the second limiting boss. In the second rotation position, the second limiting boss is limitedly clamped in the connecting joint limiting groove, so that the first connecting joint and the guide rod joint are limitedly connected.

6. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to any one of claims 1 to 5, characterized in that: The push guide rod comprises: The guide rod body includes a first splicing unit and a second splicing unit; The fastening structure is connected to the first splicing unit and the second splicing unit, so that the first splicing unit and the second splicing unit are spliced ​​together to form the hollow cavity.

7. The measurement system for obtaining surrounding rock characteristics based on well logging technology according to any one of claims 1 to 5, characterized in that: The sealing device also includes a switch component, a water inlet, a pressure inlet and a pressure discharge port are opened on the pipe wall of the pipe; a first flow channel and a second flow channel are formed in the pipe wall; the first flow channel and the second flow channel are arranged at intervals along the axial direction; the water inlet and the pressure inlet are both connected to the first flow channel, and the water discharge port and the pressure discharge port are both connected to the second flow channel; the pressure inlet is connected to the water-filled gap and the first flow channel, and the pressure discharge port is connected to the water-filled gap and the second flow channel; A switch component is arranged at the drain outlet, and is used to open or block the drain outlet; when the water pressure in the water-filled gap is greater than the blocking force of the switch component on the drain outlet, the switch component opens the drain outlet, so that the water in the second flow channel flows from the drain outlet into the borehole.

8. A method for measuring surrounding rock characteristics based on well logging technology, characterized in that: Based on the measurement system for obtaining surrounding rock characteristics based on well logging technology according to any one of claims 1 to 7, the method comprises: The sealing device is placed at a target depth in the borehole by means of a sealing guide rod, the assembly cavity of the sealing device is sealed and equipped with a pushing device, and a test probe extending out of the assembly cavity is installed at the far end of the pushing device; injecting water into the water-filled gap to expand the elastic shell until it abuts against the inner wall of the borehole, and at the same time filling the borehole with water through the drain port so that the test probe is in a liquid environment; Acquire rock formation data through test probes; Test surrounding rock properties are determined based on the formation data.

9. The method for obtaining surrounding rock characteristics based on well logging technology according to claim 8, characterized in that: The step of obtaining rock formation data by using a test probe includes: Generate sound wave pulses through the measuring probe and transmit them to the inner wall of the borehole; Receiving, by means of a measuring probe, a sound wave signal reflected back by the sound wave pulse after it propagates through the rock formation; The acoustic wave signal and the acoustic wave propagation time are determined as rock formation data; the acoustic wave propagation time is the time difference between the measurement probe generating the acoustic wave pulse and the measurement probe receiving the acoustic wave signal.

10. The method for obtaining surrounding rock characteristics based on well logging technology according to claim 8, characterized in that: The step of obtaining rock formation data by using a test probe includes: Generate gamma rays through a measuring probe and transmit them to the inner wall of the borehole; receiving, by means of a measuring probe, gamma ray data that is scattered back after the gamma ray propagates through the rock formation; The amount and intensity of the scattered gamma rays are determined as formation data.

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