Downhole data acquisition device for oil and gas wells

Abstract

The present invention relates to the technical field of drilling, and specifically to a downhole data acquisition device for oil and gas wells, comprising a connecting tube and a transmitter, wherein the end of the connecting tube is rotatably provided with a cylinder with both ends closed, the transmitter is arranged in the cylinder, a motor is placed in the connecting tube, the output end of the motor is movable through the connecting tube and connected to the cylinder, a bracket for placing a cylinder is provided in the cylinder, the two ends of the bracket are fixedly connected to the bottom and top of the cylinder respectively, and the bracket is provided with at least three placement racks from bottom to top, a cylinder is installed in the placement rack, each cylinder is connected to a plate assembly, a placement hole is opened on the cylinder, the cylinder drives the plate assembly to move in the placement hole, and a number of sensors are embedded in the plate assembly. The device is used to solve the technical problem that the existing data acquisition device is usually designed independently of the measurement system and fails to combine with the high-precision full-circular measurement requirements in the variable-diameter wellbore environment, resulting in insufficient coordination between data acquisition and transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of well drilling, and in particular to a downhole data acquisition device for an oil and gas well. Background Art

[0002] After oil and gas well completion, reservoir evaluation and perforation optimization rely on precise downhole data acquisition, but existing measurement technologies have significant limitations. First, although conventional full-circumference measurement can quickly obtain overall data of the formation around the wellbore, its low resolution makes it difficult to accurately identify thin layers, microfractures, or heterogeneous reservoir characteristics, resulting in suboptimal perforation location selection and affecting final production. While high-resolution directional measurement can provide local data with millimeter-level accuracy, its detection range is limited and it can only obtain formation information in a certain direction, failing to fully reflect the formation characteristics around the wellbore.

[0003] Furthermore, drilling often encounters complex geological conditions, including high-pressure zones, low-pressure zones, prone-to-collapse zones, and quicksand zones. This necessitates the installation of casing of varying diameters to isolate risky zones, creating a variable-diameter wellbore configuration. Existing external probes are susceptible to interference from wellbore steps and sudden diameter changes while moving within the variable-diameter wellbore, resulting in reduced measurement stability, limited accessibility, and even instrument jamming. Furthermore, real-time transmission of downhole data presents challenges. Traditional cable transmission methods are limited by complex wellbore structures, high-temperature and high-pressure environments, and the need for long-term monitoring. These risks include signal attenuation and cable damage, which impact the reliability and efficiency of data transmission. Wireless electromagnetic transmission technology, however, effectively mitigates these challenges, enabling high-speed and stable transmission of downhole data using electromagnetic signals, making it particularly suitable for complex wellbore conditions. However, existing data acquisition devices are often designed independently of the measurement system and fail to integrate the high-precision, full-circumferential measurement requirements of variable-diameter wellbores. This results in insufficient synergy between data acquisition and transmission, impacting overall operational efficiency. Therefore, an integrated downhole data acquisition and wireless transmission solution optimized for variable-diameter wellbores is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil and gas well downhole data acquisition device to solve the technical problem that existing data acquisition devices are usually designed independently of the measurement system and fail to combine with the high-precision omni-circular measurement requirements in a variable-diameter wellbore environment, resulting in insufficient coordination between data acquisition and transmission, affecting overall operational efficiency.

[0005] The present invention is achieved through the following technical solutions:

[0006] A downhole data acquisition device for an oil and gas well comprises a connecting tube and a transmitter, wherein the end of the connecting tube is rotatably provided with a cylinder body with closed ends, the transmitter is arranged in the cylinder body, a motor is placed in the connecting tube, the output end of the motor movably passes through the connecting tube and is connected to the cylinder body, a bracket for placing a cylinder is provided in the cylinder body, the two ends of the bracket are fixedly connected to the bottom and top of the cylinder body respectively, at least three placement racks are arranged in sequence from bottom to top, a cylinder is installed in the placement rack, each cylinder is connected to a plate assembly, the cylinder body is provided with placement holes having the same number as the cylinders, the cylinder drives the plate assembly to move in the placement holes, and a number of sensors are embedded in the plate assembly. The cylinder provided in this application moves the plate assembly from the placement hole toward the well wall. After detecting the data in the corresponding direction, the motor is used to rotate it to the next detection position and operate again. By storing all the detected components in the cylinder and performing detection through the rotating cylinder, the technical problem of achieving high-precision, full-circumferential, stable downhole data acquisition and wireless transmission in a variable-diameter wellbore environment is solved, thereby overcoming the shortcomings of existing measurement methods, ensuring accurate optimization of perforation positions, and ultimately improving oil and gas well production and development efficiency.

[0007] Furthermore, the plate assembly includes a connecting plate and several detection plates, with sensors distributed on each detection plate. The detection plates are sequentially hinged head-to-tail, with torsion springs connecting the connecting plates to rotating rods at each end. The two rotating rods respectively connect the two detection plates at the end of the hinge. In the initial state, a preset gap is provided between each detection plate and the connecting plate. This arrangement enables the detection plates to form a chain-like flexible structure through the end-to-end hinges. When encountering a protrusion, the hinge can bend locally to avoid it. When encountering a depression, the torsion spring pushes the rotating rod, causing the detection plate to extend toward the well wall within the preset gap range, fitting the well wall as closely as possible and reducing detection blind spots.

[0008] Furthermore, the connecting plate is equipped with a number of telescopic rods, equal in number to the number of detection plates. Initially, each telescopic rod is aligned with each detection plate, and located within the gap between the connecting plate and the detection plate. This helps the detection plates maintain contact pressure with the wellbore wall, reducing detection blind spots caused by uneven wellbore walls. For steep slopes between uneven surfaces, the telescopic rods can elastically expand and contract to compensate for height differences.

[0009] Furthermore, the connecting plate is equipped with several flexible support blocks, each located between two adjacent telescopic rods. Initially, the flexible support blocks are in contact with the detection plate. The flexible support blocks provide support for the detection plates, allowing them to maintain vertical contact with the wellbore wall. This allows for both measurements on flat wellbore walls and, when uneven, measurements on curved paths, using the articulated, split detection plates.

[0010] Furthermore, the plurality of telescopic plates and the plurality of detection plates are hinged one by one.

[0011] Furthermore, fixing plates are provided at the top and bottom of the inner wall of the cylinder, and the two ends of the bracket are fixed to the two fixing plates. The two fixing plates are provided with first chutes corresponding to the number of placement holes. The two ends of the connecting plate are connected to support plates, which are slidably arranged in the first chutes via sliders. This greatly reduces the force on the cylinder.

[0012] Furthermore, a mounting groove is provided on the support plate, a second sliding groove is provided on the side wall opposite to the mounting groove, the two sides of the sliding plate are slidably arranged in the second sliding groove, and the connecting plate is connected to the support plate through the sliding plate, so that the extension distance can be further.

[0013] Furthermore, an elastic sealing ring is provided on the inner edge of the placement hole to protect the cylinder from being polluted as much as possible.

[0014] Furthermore, a buffer pad is provided at the end of the first chute to prevent the support plate from hard collision with the end of the chute, thereby protecting the integrity of the mechanism.

[0015] Furthermore, the angles of the plurality of placement holes are set at intervals, and the measurement intervals in each direction are the same to ensure data consistency.

[0016] Furthermore, the flexible support block is silicone foam.

[0017] Furthermore, the cylinders are all arranged horizontally.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. This application utilizes a cylinder, a motor, and a plate assembly. The cylinder drives the plate assembly to contact the wellbore wall. After contact is established, the motor rotates to detect the next position. The cylinder, motor, and plate are all integrated into a cylinder. By housing all the detection components within the cylinder, this solves the technical problem that existing data acquisition devices are usually designed independently of the measurement system and fail to meet the requirements of high-precision, full-circumferential measurement in variable-diameter wellbore environments, resulting in insufficient coordination between data acquisition and transmission, which affects overall operational efficiency.

[0020] 2. This application improves the lower level of the plate assembly so that the plate assembly includes a plurality of hinged detection plates. This arrangement enables the detection plates to form a chain-like flexible structure by being hinged at the head and tail. When encountering a protrusion, the hinge can bend locally to avoid it. When encountering a depression, the torsion spring pushes the rotating rod to extend the detection plate toward the well wall within a preset gap range, so that it fits the well wall as closely as possible and reduces the detection blind spot.

[0021] 3. This application provides telescopic rods and flexible support blocks between adjacent telescopic rods, so that measurements can be performed when the well wall is flat, and when there are bumps on the well wall, the articulated split detection plate can be used to adapt to the curved path for measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0023] Figure 1 This is a schematic structural diagram of the overall structure of the present invention being inside a well;

[0024] Figure 2 Schematic diagram of the structure of the plate assembly in Example 1 of the present invention;

[0025] Figure 3 This is a structural diagram of the cylinder driving the connecting plate to move out of the placement hole in Example 2 of the present invention;

[0026] Figure 4 This is a structural diagram of the cylinder driving the connecting plate back into the cylinder in Example 2 of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the detection plate of the present invention in contact with the well wall;

[0028] Figure 6 Schematic diagram of the structure of the sliding plate and the supporting plate sliding relative to each other in Example 3 of the present invention;

[0029] Figure 7 This is the first gap state in embodiment 2 of the present invention;

[0030] Figure 8 This is the second gap state in embodiment 2 of the present invention.

[0031] Markings and corresponding parts names in the accompanying drawings:

[0032] 1-connecting cylinder; 2-cylinder body; 3-motor; 4-cylinder; 5-bracket; 6-placing rack; 7-connecting plate; 8-detection plate; 9-rotating rod; 10-gap; 11-telescopic rod; 12-flexible support block; 13-fixed plate; 14-first slide groove; 15-support plate; 16-mounting groove; 17-sliding plate; 18-plate assembly; 19-placing hole; 21-first detection plate; 22-second detection plate; 23-third detection plate; 24-fourth detection plate; 25-fifth detection plate; 26-sixth detection plate; 27-gap I; 28-gap II; 29-gap III; 30-gap IV; 31-gap V; 32-gap VI; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0034] Example 1:

[0035] Currently, the formations commonly encountered in drilling contain complex geological conditions such as high-pressure layers, low-pressure layers, easily collapsed layers or quicksand layers. It is necessary to isolate the risky layers by inserting casings of different diameters to form a variable-diameter wellbore structure. However, the existing external probes are easily disturbed by well wall steps, diameter mutations, etc. when moving in the variable-diameter wellbore, resulting in reduced measurement stability, limited passability, and even possible instrument jamming.

[0036] like Figure 1 and Figure 2 As shown, the present application provides a connecting cylinder 1, one end of the connecting cylinder 1 is connected to the oil cylinder, and the other end of the connecting cylinder 1 is rotatably provided with a cylinder 2 with closed two ends. A motor 3 is placed in the connecting cylinder 1, and the output end of the motor 3 is movable through the connecting cylinder 1 and connected to the cylinder 2. The motor 3 can drive the cylinder 2 to rotate on the connecting cylinder 1, and a bracket 5 for placing the cylinder 4 is provided in the cylinder 2. The two ends of the bracket 5 are fixedly connected to the bottom and top of the cylinder 2 respectively, and the bracket 5 is sequentially provided with at least three placement racks 6 from bottom to top. The placement rack 6 is installed with a cylinder 4, and each cylinder 4 is connected to a plate assembly 18. The cylinder 2 is provided with placement holes 19 with the same number as the cylinder 4. The cylinder 4 drives the plate assembly 18 to move in the placement hole 19, and a number of sensors are embedded in the plate assembly 18. A transmitter is also provided in the cylinder 2. The transmitter of the present application can be set at any position of the cylinder 2, and the installation position of the transmitter is not specifically limited.

[0037] It should be noted that an elastic sealing ring is provided on the inner edge of the placement hole 19 .

[0038] It should be noted that the cylinders 4 are all horizontally arranged.

[0039] It should be noted that the angles of the plurality of placement holes 19 are arranged at intervals.

[0040] The specific working principle of this embodiment 1 is:

[0041] When the cylinder 2 has reached the specified target layer, the control system starts each cylinder 4 to drive the plate assembly 18 to move out of the placement hole 19 until the cylinder 4 drives the plate assembly 18 to come into contact with the well wall. If the pressure sensor embedded in one of the plate assemblies 18 feels the pressure, the control system stops the cylinder 4 of the corresponding plate assembly 18, and the same is true for the other plate assemblies 18. When all the plate assemblies 18 have come into contact with the well wall, the sensors on the plate assembly 18 for detecting other data in the oil and gas well start to work, and the sensors transmit the data to the transmitter. The transmitter then wirelessly transmits the formation parameters collected by the downhole sensor to the ground receiving system. The ground receiving system receives the data detected in the direction of the current plate assembly 18. At this time, the control system retracts the cylinder 4 again. It can be retracted to the initial position or preset to a certain distance to facilitate the subsequent rotation of the cylinder 2 to prevent friction with the well wall.

[0042] When the cylinder 4 is fully retracted, the control system immediately triggers the motor 3 to rotate the barrel 2 to the next detection position. Since the barrel 2 and the connecting barrel 1 are arranged to rotate, the motor 3 drives the barrel 2 to rotate on the connecting barrel 1. After the barrel 2 rotates to the specified angle, the operation is performed again as described above. Each cylinder 4 is started by the control system to drive the plate assembly 18 to move toward the outside of the placement hole 19 until the barrel 2 has completed the detection of all the detection data of the well wall. This application is used to solve the problem that the existing data acquisition device is usually designed independently of the measurement system and fails to combine with the high-precision full-circle measurement requirements in the variable diameter wellbore environment, resulting in insufficient coordination between data acquisition and transmission, which affects the overall operation efficiency.

[0043] It's worth noting that the rack 6 utilizes a split ring design, consisting of two symmetrical half-rings connected by a quick-release snap mechanism. During installation, the half-ring is opened and placed horizontally within the cylinder 4. The snap mechanism is then closed and locked, securing the cylinder 4 axially parallel to the centerline of the barrel 2. This structure allows for rapid assembly and disassembly of the cylinders 4 while ensuring that all cylinders 4 remain horizontally aligned within the rack 6.

[0044] It's worth noting that an angle sensor is installed on barrel 2 or connecting barrel 1 to monitor the rotation angle of barrel 2 in real time. As motor 3 rotates barrel 2, the angle sensor records the current rotation angle of barrel 2 relative to its initial position. Before startup, the ground control system determines a reference direction, which serves as the zero point for angle measurement. Ultimately, the optimal perforation position is determined along the wellbore wall.

[0045] It should be mentioned here that when the well wall is relatively flat, the plate assembly 18 can be configured as an integrally formed plate.

[0046] Example 2:

[0047] Based on Example 1, there is another implementation method.

[0048] During the drilling process, soft formations are easily over-cut by the drill bit, resulting in diameter expansion, and hard formations are easily reduced in diameter or bulged due to slippage or insufficient crushing of the drill bit. Therefore, the well wall after drilling will appear uneven. For relatively flat well walls, an integrally formed plate can be used for contact detection. However, for uneven well walls, the bulges have a certain obstructive effect on the plate assembly 18, and in the concave areas, the plate assembly 18 cannot fully contact the well wall at the concave areas, resulting in inaccurate data collection.

[0049] like Figures 3 to 5 As shown, the plate assembly 18 in the present application includes a connecting plate 7 and several detection plates 8, each detection plate 8 is distributed with a sensor, and several detection plates 8 are hinged in sequence head to tail, and the two ends of the connecting plate 7 are connected to the rotating rod 9 by a torsion spring, and the two rotating rods 9 are respectively connected to the two detection plates 8 at the head to tail hinges, and in the initial state, a gap 10 is preset between each detection plate 8 and the connecting plate 7. Such a setting enables the detection plate 8 to form a chain-like flexible structure through the head to tail hinges. When encountering a protrusion, the hinge can bend locally to avoid it; when encountering a depression, the torsion spring pushes the rotating rod 9, so that the detection plate 8 extends toward the well wall within the preset gap 10, fits the well wall as close as possible, and reduces the detection blind spot.

[0050] It should be noted that the head-to-tail hinge connection refers to the head and tail of adjacent test plates 8 being connected by a hinge to form a joint that can rotate relative to each other. Each test plate 8 is connected in this way; the head-to-tail hinge connection can adapt to curved paths.

[0051] It should be mentioned here that the purpose of providing the gap 10 is to reserve deformation space and prevent interference between adjacent detection plates 8. The reserved deformation space is to provide space for relative rotation of adjacent detection plates 8.

[0052] It should be noted that a number of telescopic rods 11 equal to the number of detection plates 8 are provided on the connecting plate 7. In the initial state, each telescopic rod 11 is aligned with each detection plate 8, and the telescopic rod 11 is located in the gap 10 between the connecting plate 7 and the detection plate 8.

[0053] It's important to note that telescopic rod 11 consists of an outer sleeve and an inner sleeve. The inner sleeve fits over the inner wall of the outer sleeve, which is connected to the outer wall of the inner sleeve via a compression spring. In the recessed area, the spring pushes the inner sleeve outward, allowing auxiliary detection plate 8 to maintain contact pressure with the wellbore wall, reducing detection blind spots caused by uneven wellbore walls.

[0054] It should be noted that a number of flexible support blocks 12 are also provided on the connecting plate 7, each of which is located between two adjacent telescopic rods 11. In the initial state, the flexible support block 12 is in contact with the detection plate 8. The purpose of providing the flexible support blocks 12 is to provide a certain degree of support for the detection plates 8, so that the detection plates 8 can be in contact with the well wall in a vertical state, replacing the plate assembly 18 in Example 1 as an integrally formed plate. When there are uneven surfaces on the well wall, the articulated split detection plates 8 can adapt to the curved path, and the flexible support blocks 12, because they are flexible, will not cause significant obstruction to the detection plates 8.

[0055] It should be noted that the plurality of telescopic plates and the plurality of detection plates 8 are hinged one by one.

[0056] It should be noted that the flexible support block 12 is made of silicone foam.

[0057] When the detection plate 8 contacts the uneven well wall, the gap 10 will be in two states, which are represented in this application as a first gap state and a second gap state.

[0058] like Figure 7 As shown, in the first gap state (when encountering a bulge): the detection plate 8 at the bulge is squeezed by the well wall. For ease of understanding, the detection plate 8 contacting the bulge is described with the first detection plate 21, that is, the description is centered on the first detection plate 21:

[0059] The first inspection plate 21 is hinged at both ends with a second inspection plate 22 and a third inspection plate 23, which are also in close contact with the wellbore wall. The first inspection plate 21, the second inspection plate 22, and the third inspection plate 23 have corresponding gaps I 27, II 28, and III 29. When the first inspection plate 21 contacts the protrusion, the protrusion blocks the first inspection plate 21 from moving further, and the wellbore wall around the protrusion becomes relatively concave. The second inspection plate 22 and the third inspection plate 23 bend in the second direction D2 due to the concave trend of the wellbore wall. At this time, the gap I 27 corresponding to the first inspection plate 21 is in a compressed state, so its gap I 27 value is smaller than the gaps II 28 and III 29 corresponding to the second inspection plate 22 and the third inspection plate 23.

[0060] To ensure that the second and third inspection plates 22, 23 conform to the recessed wellbore, the connecting plate 7 continues to move, applying a thrust to the second and third inspection plates 22, 23 via the telescopic rod 11 until they are fully in contact with the wellbore. During this process, since the first inspection plate 21 is blocked by the protrusion, the telescopic rod 11 is squeezed, further compressing the gap I 27 of the first inspection plate 21. Ultimately, the gap I 27 of the first inspection plate 21 becomes significantly smaller than the gaps II 28 and III 29 of the second and third inspection plates 22, 23.

[0061] Second gap state (when encountering a depression): This part is the detection plate 8 corresponding to the depression. For ease of understanding, the detection plate 8 contacting the depression is described using the fourth detection plate 24. That is, the description is centered on the fourth detection plate 24.

[0062] The fourth inspection plate 24 is hinged at both ends with a fifth inspection plate 25 and a sixth inspection plate 26. The fourth inspection plate 24, the fifth inspection plate 25, and the sixth inspection plate 26 have corresponding gaps IV 30, V 31, and VI 32. Because the wellbore surrounding the recessed area is relatively convex, when the connecting plate 7 moves toward the wellbore, the fifth and sixth inspection plates 25, 26 first come into contact with the convex portion and are squeezed by the telescopic rod 11, causing the fifth and sixth inspection plates 25, 26 to bend in the first direction D1. At this point, the fourth inspection plate 24 has not yet contacted the bottom of the recess, so the connecting plate 7 continues to advance, causing the telescopic rod 11 to exert greater pressure on the fifth and sixth inspection plates 26.

[0063] At the same time, the fourth detection plate 24 moves toward the bottom of the depression under the action of the corresponding telescopic rod 11 until it is completely in contact. Since the raised areas where the fifth and sixth detection plates 26 are located restrict the further movement of the connecting plate 7, their telescopic rods 11 will be compressed more tightly, while the telescopic rod 11 corresponding to the fourth detection plate 24 remains in a relatively extended state. Figure 8 As shown, the gap IV30 corresponding to the fourth detection plate 24 is larger than the gap V31 and the gap VI32 corresponding to the fifth and sixth detection plates 26 .

[0064] There is another state here, that is, when the well wall is relatively flat and has no bumps, the detection plate 8 can fit tightly.

[0065] The specific working principle of Example 2 is:

[0066] In this application, the cylinder 4 drives the connecting plate 7 to move toward the well wall. When some of the detection plates 8 have come into contact with the raised portion of the well wall, while other detection plates 8 have not yet come into contact with the recessed portion, the cylinder 4 can continue to push the connecting plate 7 toward the well wall. At this time, for some of the detection plates 8 that have come into contact with the raised portion, although these detection plates cannot move after coming into contact with the well wall, due to the elastic support of the telescopic rod 11, the detection plates 8 corresponding to the raised portion are squeezed by the telescopic rod 11, and the detection plates 8 maintain stable and continuous contact with the raised portion, thus not hindering the connecting plate 7 from continuing to move toward the well wall. As the connecting plate 7 continues to move forward toward the well wall, the distance between the connecting plate 7 and the detection plate 8 corresponding to the raised portion gradually decreases.

[0067] For the inspection plate that isn't touching the recessed area, the continued movement of the connecting plate 7 pushes the inspection plate 8 in the recessed area toward the well wall via the telescopic rod 11. This allows the inspection plate 8 to gradually contact the recessed well wall for inspection. Once the entire well wall on that side has been inspected, the control system retracts the cylinder 4 to a preset position. Therefore, for surfaces with a certain slope between the protrusion and the recess, the use of the telescopic rod 11 and the hinged inspection plate 8 can solve the problem of the plate being unable to contact the well wall due to uneven surfaces.

[0068] Example 3:

[0069] like Figure 6 As shown, fixed plates 13 are respectively provided at the top and bottom ends of the inner wall of the cylinder 2, and the two ends of the bracket 5 are respectively fixed on the two fixed plates 13. The two fixed plates 13 are provided with first slide grooves 14 corresponding to the number of placement holes 19, and the two ends of the connecting plate 7 are respectively connected to support plates 15, which are slidably arranged in the first slide grooves 14 through sliders.

[0070] It should be noted that a mounting groove 16 is provided on the support plate 15 , and a second sliding groove is provided on the side wall opposite to the mounting groove 16 . The sliding plates 17 are slidably arranged on both sides in the second sliding grooves, and the connecting plate 7 is connected to the support plate 15 through the sliding plates 17 .

[0071] It should be noted that a buffer pad is provided at the end of the first chute 14 .

[0072] Example 3 specific working principle:

[0073] When the cylinder 4 drives the connecting plate 7 to move out of the placement hole 19, since the connecting plate 7 is connected to the sliding plate 17, the sliding plate 17 can be displaced along the second slide groove of the support plate 15. Therefore, it can first drive the sliding plate 17 to move on the support plate 15, and then drive the support plate 15 to move in the first slide groove 14. The support plate 15 has a certain supporting effect on the connecting plate 7, reducing the gravity on the cylinder 4, and the sliding plate 17 can expand the moving distance, so that the moving distance of the connecting plate 7 is not limited to the first slide groove 14.

[0074] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A downhole data acquisition device for an oil and gas well, comprising a connecting tube (1) and a transmitter, characterized in that: The end of the connecting cylinder (1) is rotatably provided with a cylinder (2) with both ends closed, a transmitter is provided in the cylinder (2), a bracket (5) for placing the cylinder (4) is provided in the cylinder (2), the two ends of the bracket (5) are respectively fixedly connected to the bottom and the top of the cylinder (2), the bracket (5) is provided with at least three placement racks (6) from bottom to top, the placement racks (6) are installed with cylinders (4), each cylinder (4) is connected to a plate assembly (18), the cylinder (2) is provided with placement holes (19) with the same number as the cylinders (4), the cylinders (4) drive the plate assembly (18) to move in the placement holes (19), and a plurality of sensors are embedded in the plate assembly (18), and the plate assembly is used to detect the well wall; the plate The body assembly (18) includes a connecting plate (7) and a plurality of detection plates (8), wherein sensors are distributed on each detection plate (8), and the plurality of detection plates (8) are hinged in sequence at the head and tail ends, and two rotating rods (9) are respectively connected to the two detection plates (8) at the head and tail ends of the hinges, and in an initial state, a gap (10) is preset between each detection plate (8) and the connecting plate (7), and the gap is used to provide a space for relative rotation of adjacent detection plates (8); a plurality of telescopic rods (11) equal in number to the number of detection plates (8) are provided on the connecting plate (7), and in an initial state, each telescopic rod (11) is aligned with each detection plate (8), and the telescopic rod (11) is located in the gap (10) between the connecting plate (7) and the detection plate (8).

2. The downhole data acquisition device for oil and gas wells according to claim 1, characterized in that: A plurality of flexible support blocks (12) are also provided on the connecting plate (7), each flexible support block (12) being located between two adjacent telescopic rods (11). In an initial state, the flexible support block (12) is in contact with the detection plate (8).

3. The downhole data acquisition device for oil and gas wells according to claim 1, characterized in that: The plurality of telescopic rods (11) and the plurality of detection plates (8) are hinged one by one.

4. The downhole data acquisition device for oil and gas wells according to any one of claims 1 to 3, characterized in that: Fixed plates (13) are respectively provided at the top and bottom ends of the inner wall of the cylinder (2), and the two ends of the bracket (5) are respectively fixed on the two fixed plates (13). The two fixed plates (13) are provided with first sliding grooves (14) corresponding to the number of placement holes (19). The two ends of the connecting plate (7) are respectively connected to support plates (15), and the support plates (15) are slidably arranged in the first sliding grooves (14) through sliders.

5. The downhole data acquisition device for oil and gas wells according to claim 4, characterized in that: A mounting groove (16) is provided on the support plate (15), a second sliding groove is provided on the side wall opposite to the mounting groove (16), both sides of the sliding plate (17) are slidably arranged in the second sliding groove, and the connecting plate (7) is connected to the support plate (15) through the sliding plate (17).

6. The downhole data acquisition device for oil and gas wells according to claim 4, characterized in that: An elastic sealing ring is provided on the inner edge of the placement hole (19).

7. The downhole data acquisition device for oil and gas wells according to claim 4, characterized in that: A buffer pad is provided at the end of the first chute (14).

8. The downhole data acquisition device for oil and gas wells according to claim 4, characterized in that: The angles of the plurality of placement holes (19) are arranged at intervals.

9. The downhole data acquisition device for oil and gas wells according to claim 2, characterized in that: The flexible support block (12) is made of silicone foam.

10. The downhole data acquisition device for oil and gas wells according to claim 4, characterized in that: The cylinders (4) are all arranged horizontally.

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