Laser measuring device for geophysical prospecting logging internal detection

Abstract

The invention discloses a laser measuring device for geophysical prospecting logging internal detection, and belongs to the technical field of laser strain measurement, the laser measuring device comprises a laser range finder, the laser range finder is in signal connection with a trigger switch, a first motor is arranged on the lower side of the center position of a platform, and the output end of the first motor is fixedly connected with a rotating shaft through a coupler; the rotating shaft is rotationally connected to the platform through a sealing bearing, the upper end of the rotating shaft is connected with a rotary table through a connecting mechanism, the laser range finder is installed on the rotary table, and the inclination angle of the laser range finder is adjustable. The lower side of the platform is slidably connected with a plurality of positioning mechanisms which are annularly arranged at equal intervals, and the platform is provided with a first air bag which is connected with the positioning mechanisms and used for pushing the positioning mechanisms to synchronously stretch out; a through hole is formed in the platform, the position of the through hole is aligned with the first air bag, the first air bag partially extends into the through hole, and the first air bag can turn on the trigger switch. The device has the advantages of stability, flexibility in angle measurement, automation degree, adaptability to different well diameters and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of laser strain measurement, and in particular relates to a laser measurement device for internal detection of geophysical wells. Background Art

[0002] In the field of modern geophysical wellbore detection technology, laser measurement devices are widely used as an important non-contact measurement method to obtain accurate information about the structure in the well. However, existing laser measurement devices have exposed a series of problems in practical applications: The traditional way of fixing laser measurement devices in the well is usually simple and rough, and it is difficult to adapt to the complex and changeable well environment. Some devices use a rigid support structure to contact the well wall, but this method cannot ensure the stable fixation of the device when the well wall surface is uneven, there are cracks or soft formations. For example, in an environment with water flow impact or slight vibration of the well wall, the device is prone to displacement and shaking, which greatly affects the accuracy and reliability of laser measurement. Since the principle of laser ranging is to calculate the distance based on the propagation time of light, even a slight shake of the device will cause a large deviation in the measurement result, and it cannot accurately reflect the actual position and shape changes of the well wall, thereby making the subsequent strain analysis and stability assessment of the well lose the basis for accuracy.

[0003] In terms of the flexibility of measuring angles, existing laser measurement devices also have obvious shortcomings. Most traditional devices have fixed laser emission angles, or can only measure at a limited number of preset angles, making it difficult to achieve detailed all-round and multi-angle scanning of the well wall. This results in the inability to fully capture the strain information of the well reflected by these subtle changes when faced with complex deformations of the well wall, such as local depressions, protrusions or irregular bends. For some potential safety hazards, such as the direction and extent of the expansion of tiny cracks in the well wall, key details cannot be accurately detected due to the limitations of the measurement angle, making it difficult to comprehensively and deeply assess the structural integrity of the well, and difficult to meet the needs of modern geophysical well logging for high-precision and high-reliability data.

[0004] In addition, the existing laser measurement devices need to be improved in terms of automation and adaptability. Many devices require manual and complex installation, debugging and angle adjustment operations, which not only increases the labor intensity and technical requirements of operators, but also easily introduces human errors. At the same time, when faced with wells of different diameters, these devices often lack effective adaptive adjustment mechanisms and require the replacement of different accessories or cumbersome mechanical adjustments, which seriously affects the detection efficiency and versatility of the device.

[0005] In summary, the existing laser measurement devices have many problems in terms of stability, measurement angle flexibility, degree of automation, and adaptability to different well diameters, making it difficult to meet the growing demand for high-precision, high-efficiency, and high-reliability measurements in geophysical well logging. Therefore, the development of a new type of laser measurement device for internal detection of geophysical well logging that can overcome the above-mentioned defects has important practical significance and market value. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a laser measuring device for internal detection of geophysical wellbore, which has advantages in stability, measurement angle flexibility, degree of automation and adaptability to different well diameters, and solves the problems of the prior art.

[0007] The present invention is implemented as follows: a laser measuring device for internal detection of geophysical wells comprises a laser rangefinder, wherein the laser rangefinder signal is connected to a trigger switch, and further comprises a platform, wherein a first motor is arranged on the lower side of the center position of the platform, wherein the output end of the first motor is fixedly connected to a rotating shaft through a coupling, wherein the rotating shaft is rotatably connected to the platform through a sealed bearing, wherein the upper end of the rotating shaft is connected to a turntable through a connecting mechanism, wherein the laser rangefinder is mounted on the turntable, and wherein the inclination angle of the laser rangefinder is adjustable; wherein a plurality of positioning mechanisms arranged equidistantly in an annular manner are slidably connected to the lower side of the platform, wherein a first airbag is installed on the platform, wherein the first airbag is connected to a driving mechanism, wherein the first airbag is connected to the positioning mechanism and is used to push the positioning mechanism to extend synchronously; wherein a through hole is arranged on the platform, wherein the position of the through hole is aligned with that of the first airbag, wherein a portion of the first airbag extends into the through hole, and wherein the first airbag can open the trigger switch.

[0008] As a preferred embodiment of the present invention, the driving mechanism includes an air pump and an air storage bag, the air inlet end of the air pump is connected to the air storage bag, and the air outlet end of the air pump is connected to the first air bag.

[0009] As a preferred embodiment of the present invention, the driving mechanism includes: a second airbag is fixedly connected to the lower side of the platform, the second airbag is connected to the first airbag through a pipe, and the second airbag is an annular airbag; an external thread and an annular give way groove are provided on the rotating shaft, the annular give way groove is located on the upper side of the external thread, a lifting plate is sleeved on the rotating shaft, the middle part of the lifting plate is connected to the external thread by a thread, and the lifting plate is attached to the lower surface of the second airbag; the lifting plate is slidably connected with a guide rod, and the guide rod is connected to the lower side of the platform.

[0010] As a preferred embodiment of the present invention, a sealed shell is fixedly connected to the lower side of the center position of the platform, the first motor is installed in the sealed shell, and the second airbag is located in the sealed shell.

[0011] As a preferred embodiment of the present invention, the positioning mechanism includes: a sliding plate, a T-shaped limit block, a pressure plate and a connecting plate; the sliding plate is attached to the lower surface of the platform, and a slideway is provided on the sliding plate; the T-shaped limit block is fixedly connected to the lower side of the platform, and the T-shaped limit block and the slideway cooperate; the pressure plate is fixedly connected to the outer end of the sliding plate; the connecting plate is fixedly connected to the inner end of the sliding plate, and the connecting plate is connected to the first airbag.

[0012] As a preferred embodiment of the present invention, a notch is provided at the edge of the platform, and the pressing plate is fitted into the notch.

[0013] As a preferred embodiment of the present invention, the connecting mechanism includes a cylinder, the upper end of the cylinder is fixedly connected to the lower side of the turntable, the lower end of the cylinder is fixedly connected to a ring, the inner ring of the ring is provided with a card interface; the upper end of the rotating shaft is located in the through hole, and a card block is fixedly connected to the side wall of the rotating shaft; a lifting seat is slidably connected in the through hole, and a universal ball is fixedly connected to the upper end of the lifting seat, the first airbag can push the lifting seat to rise, and the universal ball can push the turntable to rise.

[0014] As a preferred embodiment of the present invention, the turntable includes a base, a frame, a second motor, and a table body; the lower side of the base is fixedly connected to the cylinder; the frame is fixedly connected to the upper side of the base; the second motor is fixedly connected to the side of the frame; the table body is rotatably connected to the frame, and one side is connected to the output shaft of the second motor, and the laser rangefinder is fixedly connected to the table body.

[0015] As a preferred embodiment of the present invention, it also includes a logging winch connected to the platform; the platform is also equipped with a resistivity gamma combination probe, a logging probe and a digital three-arm caliper probe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Stable and reliable measurement basis: Through the close contact between the positioning mechanism and the well wall, it can provide a stable support and fixation for the measuring device in the complex and changeable well environment, effectively avoiding the interference and error of the measurement results caused by factors such as device shaking and displacement, greatly improving the accuracy and reliability of the measurement data, so that the measurement results can truly reflect the actual strain of the well, and provide a solid data basis for subsequent well condition assessment and maintenance decisions.

[0017] 2. Highly automated operation: The entire measurement process, from the fixation of the device to the start of the measurement and subsequent measurement actions, is realized through automated links such as the drive mechanism, airbag triggering and the rotation of the first motor. There is no need for complex manual operation and adjustment. This not only reduces the labor intensity and work difficulty of the operator, but also reduces various uncertainties and errors that may be introduced during manual operation, significantly improving the efficiency and quality of the measurement work, while also improving the safety and convenience of the measurement operation.

[0018] 3. Flexible and comprehensive measurement capabilities: The design of adjustable angle between the laser rangefinder and the turntable, combined with the rotation of the turntable, enables the laser rangefinder to perform multi-angle and all-round laser scanning measurements on the well wall, and can obtain detailed distance data at different positions and directions of the well wall. Compared with traditional single-angle or fixed measurement devices, this design can capture the strain characteristics and change trends of the well wall more comprehensively and accurately, providing richer and more comprehensive information for in-depth analysis of the structural integrity, stability and potential safety hazards of the well, helping to promptly discover abnormal conditions of the well and take targeted maintenance and repair measures to ensure the long-term safe operation of the well, and is suitable for wells of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the laser measuring device for internal detection of geophysical wellbore provided by an embodiment of the present invention from a first viewing angle; Figure 2 is a schematic diagram of a right-view structure provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides Figure 2 Schematic diagram of the cross-sectional structure of the AA part; Figure 4 The embodiment of the present invention provides Figure 3 A schematic diagram of the enlarged structure of part B; Figure 5 The embodiment of the present invention provides Figure 4 A schematic diagram of the enlarged structure of the D part; Figure 6 The embodiment of the present invention provides Figure 3 A schematic diagram of the enlarged structure of the middle C part; Figure 7 It is a schematic diagram of the three-dimensional structure of the laser measuring device for internal detection of geophysical wellbore provided by an embodiment of the present invention from a second viewing angle; Figure 8 The embodiment of the present invention provides Figure 7 Schematic diagram of the enlarged structure of part E.

[0020] In the figure: 1. laser rangefinder; 2. platform; 3. first motor; 4. rotating shaft; 5. connecting mechanism; 51. cylinder; 52. ring; 53. card interface; 54. card block; 7. positioning mechanism; 8. first airbag; 9. driving mechanism; 10. through hole; 11. external thread; 12. annular make way groove; 13. sealing shell; 14. notch; 15. lifting seat; 16. universal ball; 61. base; 62. frame; 63. second motor; 64. platform; 71. sliding plate; 72. T-type limit block; 73. pressure plate; 74. connecting plate; 91. second airbag; 92. lifting plate; 93. guide rod. DETAILED DESCRIPTION

[0021] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0022] The structure of the present invention is described in detail below in conjunction with the accompanying drawings.

[0023] like Figures 1 to 8 As shown, a laser measuring device for internal detection of geophysical wells provided by an embodiment of the present invention comprises a laser rangefinder 1, wherein the signal of the laser rangefinder 1 is connected to a trigger switch, and is characterized in that it also comprises a platform 2, wherein a first motor 3 is provided at the lower side of the center position of the platform 2, and an output end of the first motor 3 is fixedly connected to a rotating shaft 4 through a coupling, and the rotating shaft 4 is rotatably connected to the platform 2 through a sealed bearing, and an upper end of the rotating shaft 4 is connected to a turntable through a connecting mechanism 5, and the laser rangefinder 1 is installed on the turntable, and the inclination angle of the laser rangefinder 1 is adjustable; a plurality of annular equidistantly arranged positioning mechanisms 7 are slidably connected to the lower side of the platform 2, and a first airbag 8 is installed on the platform 2, and the first airbag 8 is connected to a driving mechanism 9, and the first airbag 8 is connected to the positioning mechanism 7 to push the positioning mechanism 7 to extend synchronously; a through hole 10 is provided on the platform 2, and the position of the through hole 10 is aligned with the first airbag 8, and the first airbag 8 partially extends into the through hole 10, and the first airbag 8 can turn on the trigger switch.

[0024] With the above arrangement, when preparing to conduct in-well detection, the driving mechanism 9 is first started. The operation of the driving mechanism 9 causes the first airbag 8 to begin to expand. Since the first airbag 8 is connected to the positioning mechanism 7, as the first airbag 8 expands, the thrust generated by it will push the positioning mechanisms 7 arranged in a circular shape and equidistantly on the lower side of the platform 2 to extend outward synchronously along the direction of the sliding connection. After extending, these positioning mechanisms 7 will be tightly pressed against the well wall, thereby firmly fixing the entire measuring device at a predetermined position in the well, providing a stable basic condition for subsequent precise measurement. At the same time, the continuously expanding first airbag 8 will partially extend into the through hole 10, thereby triggering the trigger switch. After being triggered, the trigger switch will send a signal to the laser rangefinder 1, so that the laser rangefinder 1 starts and enters a working ready state.

[0025] After the laser rangefinder 1 is ready, the first motor 3 starts to operate. The output end of the first motor 3 drives the rotating shaft 4 to rotate through the coupling. Since the rotating shaft 4 is rotatably connected to the platform 2 through the sealed bearing, it can rotate stably, thereby driving the turntable connected to its upper end to rotate. The laser rangefinder 1 is installed on the turntable, and the angle between it and the turntable is adjustable, so that during the rotation of the turntable, the laser rangefinder 1 can emit a laser beam to the well wall at different angles and receive the reflected laser signal. By accurately measuring the time interval between the emission and reflection of the laser beam, according to the principle of the invariance of the speed of light, the distance between the laser rangefinder 1 and each measuring point on the well wall can be calculated, thereby realizing a comprehensive measurement of the strain of the well, obtaining relevant data information such as the shape change and structural deformation of the well wall, and then analyzing the stability of the well. Since the inclination angle of the laser rangefinder 1 is adjustable, deformation at different positions can be measured.

[0026] The driving mechanism 9 can be implemented in the following manner: the driving mechanism 9 includes an air pump and an air storage bag, the air inlet end of the air pump is connected to the air storage bag, and the air outlet end of the air pump is connected to the first air bag 8. When it is necessary to start the measuring device for well detection, the air pump starts to work, extracts air from the air storage bag, and injects it into the first air bag 8. As the gas is continuously injected, the first air bag 8 gradually expands, and the thrust generated by the expansion pushes the positioning mechanism 7 connected thereto to extend outward synchronously until it hits the well wall, thereby stably fixing the entire measuring device at a predetermined position in the well. At the same time, when the first air bag 8 expands to a certain extent, it extends into the through hole 10 on the platform 2 aligned with the trigger switch, triggering the trigger switch, so that the laser rangefinder 1 enters the ready-to-work state. After the measurement is completed, the air pump works in the reverse direction, draws the gas in the first air bag 8 back into the air storage bag, and the first air bag 8 shrinks, driving the positioning mechanism 7 to retract. At this time, the measuring device can be easily taken out of the well, completing a complete measurement operation process.

[0027] The driving mechanism 9 can also be implemented in the following manner: the driving mechanism 9 includes: a second airbag 91 is fixedly connected to the lower side of the platform 2, the second airbag 91 is connected to the first airbag 8 through a pipeline, and the second airbag 91 is an annular airbag; an external thread 11 and an annular give way groove 12 are provided on the rotating shaft 4, and the annular give way groove 12 is located on the upper side of the external thread 11; a lifting plate 92 is sleeved on the rotating shaft 4, and the middle part of the lifting plate 92 is connected to the external thread 11 by a thread, and the lifting plate 92 is attached to the lower surface of the second airbag 91; the lifting plate 92 is slidably inserted with a guide rod 93, and the guide rod 93 is connected to the lower side of the platform 2.

[0028] Through this arrangement, the working principle of the driving mechanism 9 is: In the initial state, the lifting plate 92 is located at the starting position of the external thread 11 of the rotating shaft 4. At this time, the second airbag 91 is not squeezed and is in a natural state, and the first airbag 8 is not inflated. When the measuring device needs to be started, the motor starts to run, driving the rotating shaft 4 to rotate. Since the middle part of the lifting plate 92 is connected to the external thread 11 of the rotating shaft 4 through a thread, and the guide rod 93 on the upper side of the lifting plate 92 is connected to the lower side of the platform 2, it is ensured that the lifting plate 92 can only perform a linear lifting motion along the rotating shaft 4, so the rotation of the rotating shaft 4 will cause the lifting plate 92 to move upward along the thread.

[0029] During the process of the lifting plate 92 rising, it gradually squeezes the annular second airbag 91 located on the lower side of the platform 2. Since the second airbag 91 is connected to the first airbag 8 through a pipeline, the gas in the squeezed second airbag 91 will flow into the first airbag 8, causing the first airbag 8 to start to expand. As the first airbag 8 expands, it will push the positioning mechanism 7 to extend synchronously to the well wall to complete the fixation of the device. When the gas is continuously injected, the air pressure of the first airbag 8 increases and deforms, and part of it extends into the through hole 10 of the platform 2 and turns on the trigger switch. At this time, the laser rangefinder 1 is ready.

[0030] When the lifting plate 92 rises to the position of the annular clearance groove 12, the lifting plate 92 is no longer driven by the thread and stops rising. At this time, the rotating shaft 4 continues to rotate and the lifting plate 92 will not rise again, thereby avoiding excessive squeezing of the second airbag 91 and ensuring that the components of the measuring device are in a stable state. Thereafter, the rotating shaft 4 continues to rotate in the same direction to drive the laser rangefinder 1 to perform rotation detection. The laser rangefinder 1 emits a laser beam to the well wall and receives a reflected signal. By measuring the round-trip time of the laser beam, the distance to each point on the well wall is calculated, thereby realizing the strain measurement of the well.

[0031] Furthermore, a sealed housing 13 is fixedly connected to the lower side of the center of the platform 2, the first motor 3 is installed in the sealed housing 13, and the second airbag 91 is located in the sealed housing 13. Since the first motor 3 is installed in the sealed housing 13, during the operation of the first motor 3, the sealed housing 13 provides a closed and relatively stable working environment for the first motor 3, isolating the dust, water vapor and other impurities that may exist in the well from corroding and interfering with the motor, ensuring that the first motor 3 can operate normally and stably, thereby ensuring that subsequent measurement actions are performed accurately. At the same time, the second airbag 91 located in the sealed housing 13 plays a key role in the entire workflow. As mentioned above, when the first motor 3 drives the rotating shaft 4 to rotate, the lifting plate 92 on the rotating shaft 4 rises and squeezes the second airbag 91. Since the second airbag 91 is connected to the first airbag 8 through a pipeline, the gas in the squeezed second airbag 91 will flow into the first airbag 8, causing the first airbag 8 to expand. The expanded first airbag 8 pushes the positioning mechanism 7 to extend against the well wall to fix the device, and triggers the trigger switch of the laser rangefinder 1 to start the measurement process. In this process, the sealed shell 13 also protects the second airbag 91 to prevent it from being damaged by environmental factors in the well, ensuring that the airtightness and mechanical properties of the second airbag 91 are not affected, thereby ensuring the stability and reliability of gas transmission, so that the entire drive mechanism 9 can operate smoothly according to the expected working principle, and provide a guarantee for the stable operation of the laser measurement device in the well.

[0032] Specifically, the positioning mechanism 7 includes: a sliding plate 71, a T-shaped limit block 72, a pressure plate 73 and a connecting plate 74; the sliding plate 71 is attached to the lower surface of the platform 2, and a slideway is provided on the sliding plate 71; the T-shaped limit block 72 is fixedly connected to the lower side of the platform 2, and the T-shaped limit block 72 and the slideway cooperate; the pressure plate 73 is fixedly connected to the outer end of the sliding plate 71; the connecting plate 74 is fixedly connected to the inner end of the sliding plate 71, and the connecting plate 74 is connected to the first airbag 8.

[0033] When the driving mechanism 9 starts to work, the first airbag 8 gradually expands. Since the connecting plate 74 is fixedly connected to the inner end of the sliding plate 71, and the connecting plate 74 is connected to the first airbag 8, the thrust generated by the expansion of the first airbag 8 acts on the connecting plate 74, thereby pushing the sliding plate 71 to move along the lower surface of the platform 2. During the movement of the sliding plate 71, it cooperates with the T-shaped limit block 72 fixedly connected to the lower side of the platform 2 through the slideway. The T-shaped limit block 72 plays a role of limiting and guiding, ensuring that the sliding plate 71 can only slide outward stably along the predetermined direction without deviation or derailment, thereby ensuring the accuracy and reliability of the positioning mechanism 7. As the sliding plate 71 moves outward, the pressure plate 73 fixedly connected to the outer end of the sliding plate 71 gradually approaches the well wall, and finally presses tightly against the well wall. The friction between the pressure plate 73 and the well wall and the pressure applied by the pressure plate 73 on the well wall enable the entire measuring device to be firmly fixed at a specific position in the well, providing a stable foundation for the subsequent laser rangefinder 1 to perform precise measurements, preventing the measuring device from shaking or shifting due to factors such as water flow and vibration in the well during the measurement process, ensuring the accuracy and effectiveness of the measurement data, and further realizing reliable detection of the strain condition of the well.

[0034] Preferably, a notch 14 is formed on the edge of the platform 2 , and the pressing plate 73 is fitted into the notch 14 .

[0035] Furthermore, the connecting mechanism 5 includes a cylinder 51, the upper end of which is fixedly connected to the lower side of the turntable, the lower end of which is fixedly connected to a ring 52, and the inner ring of the ring 52 is provided with a card interface 53; the upper end of the rotating shaft 4 is located in the through hole 10, and a card block 54 is fixedly connected to the side wall of the rotating shaft 4; a lifting seat 15 is slidably connected in the through hole 10, and a universal ball 16 is fixedly connected to the upper end of the lifting seat 15, the first airbag 8 can push the lifting seat 15 to rise, and the universal ball 16 can push the turntable to rise.

[0036] In the initial state, the first airbag 8 is not inflated, the lifting seat 15 is in a lower position in the through hole 10, and the universal ball 16 does not apply an upward thrust to the turntable. At this time, the clamping block 54 is located inside the cylinder 51 and is not clamped with the clamping interface 53, so even if the shaft 4 rotates, the turntable will not rotate accordingly. When the driving mechanism 9 causes the first airbag 8 to begin to inflate, the thrust generated by the first airbag 8 pushes the lifting seat 15 to slide upward in the through hole 10. Since the universal ball 16 is fixedly connected to the upper end of the lifting seat 15, as the lifting seat 15 rises, the universal ball 16 also moves upward and contacts the lower side of the turntable, thereby applying an upward thrust to the turntable to make the turntable rise. The rise of the turntable drives the cylinder 51 to rise together. When the cylinder 51 rises to a certain height, the clamping block 54 fixed on the side wall of the shaft 4 will gradually be clamped into the clamping interface 53 opened in the inner ring of the ring 52. When the clamping block 54 is completely inserted into the clamping interface 53, an effective connection is formed between the rotating shaft 4 and the turntable through the clamping block 54 and the clamping interface 53, so that the rotation of the rotating shaft 4 can be transmitted to the turntable, thereby driving the turntable to rotate, and then the laser rangefinder 1 installed on the turntable performs measurement work as the turntable rotates, thereby realizing all-round scanning and detection of the well wall and obtaining the strain data of the well.

[0037] The beneficial effects of the above settings are: Precisely control the start of measurement: The design of the connecting mechanism 5 ensures that the turntable is connected to the shaft 4 and starts to rotate for measurement only when the first airbag 8 is inflated and the switch is triggered, which effectively avoids premature or unnecessary rotation of the turntable due to misoperation or other interference factors, ensures the accuracy and orderliness of the measurement process, enables the measurement data to accurately reflect the actual strain of the well wall, and improves the reliability and effectiveness of the measurement results.

[0038] Enhanced device stability and reliability: Before measurement, the turntable and the shaft 4 are in a separated state, which avoids unnecessary vibration or displacement of the turntable and the laser rangefinder 1 due to the rotation of the shaft 4, and ensures the stability of the measuring device in the preparation stage. At the same time, the connection between the shaft 4 and the turntable is achieved by the clamping method of the clamping block 54 and the clamping interface 53. The connection is firm and stable, and power can be reliably transmitted during the measurement process, reducing measurement errors or equipment failures caused by loose or failed connections, improving the reliability of the entire measuring device in complex well environments, and reducing equipment maintenance costs and measurement risks.

[0039] Improve the adaptability and flexibility of the equipment: The design of the connection mechanism 5 allows the connection state between the turntable and the rotating shaft 4 to be flexibly switched according to the state of the first airbag 8, which is suitable for different measurement scenarios and working conditions. For example, when transporting, installing or adjusting the position of the measuring device, the state of the turntable and the rotating shaft 4 being separated can avoid accidental damage to the components; and when measurement is required, it can quickly and accurately achieve connection and start measurement, which improves the use efficiency and adaptability of the equipment and facilitates the operator to operate and control the measuring device.

[0040] Furthermore, a trigger switch may be arranged on the upper side of the platform 2, and the trigger switch may be pressed and turned on when the lifting seat 15 rises.

[0041] Specifically, the turntable includes a base 61, a frame 62, a second motor 63, and a platform 64; the lower side of the base 61 is fixedly connected to the cylinder 51; the frame 62 is fixedly connected to the upper side of the base 61; the second motor 63 is fixedly connected to the side of the frame 62; the platform 64 is rotatably connected to the frame 62, and one side is connected to the output shaft of the second motor 63, and the laser rangefinder 1 is fixedly connected to the platform 64. Through this configuration, the second motor 63 is used to drive the platform 64 to rotate, so that the inclination angle of the laser rangefinder 1 can be adjusted.

[0042] Furthermore, it also includes a logging winch connected to the platform 2; The platform 2 is also equipped with a resistivity gamma combined probe, a well logging probe and a digital three-arm caliper probe.

[0043] Specifically, the parameters of the laser measuring device for internal detection of geophysical well logging are as follows: 1. Power supply: 220V50Hz; operating environment temperature: -20℃~45℃, operating environment humidity: ≤90% (45℃); 2. Depth measurement range: 0~1000.0m, depth resolution <5mm; 3. Downhole signal detection level: ±0.5V~±12V; Logging winch: 4. Use a single-core armored logging cable with a length of no less than 450m, an outer diameter of no less than 3mm, and at least one cable connector; 5. The electric winch should be equipped with a speed regulator, automatic cable arranger, digital depth measurement system, electric brake and emergency hand crank; 6. Operating environment: altitude not higher than 5500 meters, ambient temperature -20℃~+45℃, relative humidity ≤99%; 7. Power supply: AC voltage 220±10%, current ≤5A, 50Hz±5Hz.

[0044] Well logging probe: 8. The signal output by the probe is converted and encoded by A / D, and then sent to the ground through single-core cable transmission technology, and error correction can be performed.

[0045] Resistivity Gamma Combination Probe: 9. Measuring range: Apparent resistivity: 1~4000Ωm; Natural potential: ±1200mV; Natural gamma: 0~32768cps.

[0046] 10. Measurement accuracy: 2% (10~4000Ωm) or ±1Ωm.

[0047] Multi-parameter combined probe for acoustic velocity inclination measurement: 11.Vertex angle measurement range: 0°~50°, accuracy ±0.1°; resolution not less than 0.01.

[0048] 12. Azimuth measurement range: 0°~360°, accuracy: ±2° (vertex angle>3°).

[0049] 13. Sound velocity measurement range: 125us / m~555us / m; measurement accuracy: 5us / m.

[0050] 14. Sound amplitude measurement range: 0~2000mV; measurement accuracy: ±2%.

[0051] 15. Temperature measurement range: 0℃~100℃, resolution not less than 0.025℃.

[0052] 16. The temperature sensor must use a platinum resistor (pt1000).

[0053] Digital three-arm caliper probe: 17. Well diameter measurement range: Φ40~300mm.

[0054] 18. The measurement error is no more than 1.5%FS.

[0055] Working principle of the present invention: The operation of the driving mechanism 9 causes the first airbag 8 to start expanding. As the first airbag 8 expands, the thrust generated by it will push the positioning mechanisms 7 arranged in a circular shape and equidistantly on the lower side of the platform 2 to extend outward synchronously along the direction of the sliding connection. After extending, these positioning mechanisms 7 will be tightly pressed against the well wall, thereby firmly fixing the entire measuring device at a predetermined position in the well, providing a stable basic condition for subsequent precise measurement. At the same time, the continuously expanding first airbag 8 will partially extend into the through hole 10, thereby triggering the trigger switch. After the trigger switch is triggered, it will send a signal to the laser rangefinder 1, so that the laser rangefinder 1 starts and enters a working preparation state. After the laser rangefinder 1 is ready, the first motor 3 starts to operate. The output end of the first motor 3 drives the rotating shaft 4 to rotate through the coupling. Since the rotating shaft 4 is rotatably connected to the platform 2 through a sealed bearing, it can rotate stably, thereby driving the turntable connected to its upper end to rotate. The laser rangefinder 1 is installed on a turntable, and the angle between it and the turntable is adjustable, so that during the rotation of the turntable, the laser rangefinder 1 can emit a laser beam to the well wall at different angles and receive the reflected laser signal. By accurately measuring the time interval between the emission and reflection of the laser beam, based on the principle of the invariance of the speed of light, the distance between the laser rangefinder 1 and each measuring point on the well wall can be calculated, thereby achieving a comprehensive measurement of the strain of the well, obtaining relevant data information such as the shape change and structural deformation of the well wall, and then analyzing the stability of the well. Since the inclination angle of the laser rangefinder 1 is adjustable, deformation at different positions can be measured.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser measuring device for internal detection of geophysical wells, comprising a laser rangefinder (1), wherein the laser rangefinder (1) is signal-connected to a trigger switch, characterized in that: It also comprises a platform (2), wherein a first motor (3) is provided at the lower side of the center position of the platform (2), the output end of the first motor (3) is fixedly connected to a rotating shaft (4) via a coupling, the rotating shaft (4) is rotatably connected to the platform (2) via a sealed bearing, the upper end of the rotating shaft (4) is connected to a turntable via a connecting mechanism (5), the laser rangefinder (1) is mounted on the turntable, and the inclination angle of the laser rangefinder (1) is adjustable; The lower side of the platform (2) is slidably connected to a plurality of annular equidistantly arranged positioning mechanisms (7); the platform (2) is provided with a first airbag (8); the first airbag (8) is connected to a driving mechanism (9); the first airbag (8) is connected to the positioning mechanism (7) and is used to push the positioning mechanism (7) to extend synchronously; a through hole (10) is provided on the platform (2); the position of the through hole (10) is aligned with the first airbag (8); a portion of the first airbag (8) extends into the through hole (10); and the first airbag (8) can activate the trigger switch.

2. A laser measuring device for internal detection of geophysical wellbore according to claim 1, characterized in that: The driving mechanism (9) comprises an air pump and an air storage bag, the air inlet end of the air pump is connected to the air storage bag, and the air outlet end of the air pump is connected to the first air bag (8).

3. A laser measuring device for internal detection of geophysical wellbore according to claim 1, characterized in that: The driving mechanism (9) comprises: A second airbag (91) is fixedly connected to the lower side of the platform (2), the second airbag (91) is connected to the first airbag (8) via a pipeline, and the second airbag (91) is an annular airbag; The rotating shaft (4) is provided with an external thread (11) and an annular paving groove (12), the annular paving groove (12) is located on the upper side of the external thread (11), a lifting plate (92) is sleeved on the rotating shaft (4), the middle part of the lifting plate (92) is connected to the external thread (11) by a thread, and the lifting plate (92) is attached to the lower surface of the second airbag (91); The lifting plate (92) is slidably plugged with a guide rod (93), and the guide rod (93) is connected to the lower side of the platform (2).

4. A laser measuring device for internal detection of geophysical wellbore according to claim 3, characterized in that: A sealed housing (13) is fixedly connected to the lower side of the center position of the platform (2), the first motor (3) is installed in the sealed housing (13), and the second airbag (91) is located in the sealed housing (13).

5. The laser measuring device for internal detection of geophysical wellbore according to claim 1, characterized in that: The positioning mechanism (7) comprises: a sliding plate (71), a T-shaped limit block (72), a pressing plate (73) and a connecting plate (74); The sliding plate (71) is attached to the lower surface of the platform (2), and a slideway is provided on the sliding plate (71); The T-shaped limit block (72) is fixedly connected to the lower side of the platform (2), and the T-shaped limit block (72) cooperates with the slideway; The pressing plate (73) is fixedly connected to the outer end of the sliding plate (71); The connecting plate (74) is fixedly connected to the inner end of the sliding plate (71), and the connecting plate (74) is connected to the first airbag (8).

6. A laser measuring device for internal detection of geophysical wellbore according to claim 5, characterized in that: The platform (2) has a notch (14) on its edge, and the pressing plate (73) fits in the notch (14).

7. A laser measuring device for internal detection of geophysical wellbore according to claim 5 or 6, characterized in that: The connecting mechanism (5) comprises a cylinder (51), the upper end of the cylinder (51) is fixedly connected to the lower side of the turntable, the lower end of the cylinder (51) is fixedly connected to a ring (52), and the inner ring of the ring (52) is provided with a card interface (53); The upper end of the rotating shaft (4) is located in the through hole (10), and a clamping block (54) is fixedly connected to the side wall of the rotating shaft (4); A lifting seat (15) is slidably connected in the through hole (10), and a universal ball (16) is fixedly connected to the upper end of the lifting seat (15); the first airbag (8) can push the lifting seat (15) to rise, and the universal ball (16) can push the turntable to rise.

8. The laser measuring device for internal detection of geophysical wellbore according to claim 1, characterized in that: The turntable comprises a base (61), a frame (62), a second motor (63), and a table body (64); The lower side of the base (61) is fixedly connected to the cylinder (51); The frame (62) is fixedly connected to the upper side of the base (61); The second motor (63) is fixedly connected to a side portion of the frame (62); The platform (64) is rotatably connected to the frame (62), and one side is connected to the output shaft of the second motor (63); the laser rangefinder (1) is fixedly connected to the platform (64).

9. A laser measuring device for internal detection of geophysical wellbore according to claim 1, characterized in that: Also included is a logging winch connected to the platform (2); The platform (2) is also equipped with a resistivity gamma combination probe, a well logging probe and a digital three-arm caliper probe.

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