An eight-sector cement bond tool

Abstract

The application relates to the technical field of logging instruments, in particular to an eight-sector cementing logging instrument, which comprises a centralizer body, the upper and lower ends of the centralizer body are fixedly provided with connecting caps, the upper connecting cap is used for detachably and fixedly connecting a magnetic positioning logging device, the lower connecting cap is used for detachably and fixedly connecting an eight-sector cementing logging device, an assembly sleeve vertically arranged upwards and downwards is fixedly arranged in the middle of the assembly cavity, an electric cylinder is arranged in the assembly sleeve, a multifunctional driving plate is fixedly connected to the power output rod of the electric cylinder, a rack is symmetrically arranged on the left and right sides of the multifunctional driving plate, an idle stroke structure is arranged between the rack and the multifunctional driving plate, the linear motion of the rack and the multifunctional driving plate is meshed and driven, the linear motion is converted into the rotary unfolding action of a driving arm, so that the two driving arms can be simultaneously unfolded and returned, the driving source is the electric cylinder, and manual intervention operation is not needed in the well.

Description

Technical Field

[0001] This invention relates to the field of logging instrument technology, and in particular to an eight-sector cement-bonded logging instrument. Background Technology

[0002] The eight-sector cement-bonded joint logging tool is an indispensable core logging device in oilfield drilling and completion operations. It is primarily used to detect the bonding quality between the casing and cement sheath, and between the cement sheath and the formation in oil and water wells. It can also assist in detecting key parameters such as casing integrity, joint position, and well diameter changes. Its working process is as follows: the logging tool is lowered into the target well section via cable or drill pipe. The eight-sector cement-bonded logging device in the instrument string transmits and receives detection signals (such as acoustic signals) to and from the wellbore through eight circumferentially distributed measurement windows. Combined with auxiliary detection data from magnetic positioning logging and gamma logging devices, the final output is the cement bonding quality evaluation result. This provides reliable field data support for cementing quality acceptance of oil and water wells, subsequent well workover operations, and the formulation of oil and gas development plans, ensuring the long-term stable production of oil and gas wells.

[0003] During testing operations, the centering status of the eight-sector cement-bonded logging device directly determines the accuracy of the testing data. To ensure that the device remains stably centered after being lowered into the well, centralizers must be connected to both its upper and lower ends, and support devices must be installed on the centralizers. After the device is lowered into the target well section, it is centered and fixed by the support devices against the well wall.

[0004] For example, Chinese utility model patent application number CN215256125U discloses an eight-sector cement-bonded joint logging tool that is easy to operate and adjust. It has centralizers connected to both the upper and lower ends of the eight-sector cement-bonded logging device, and the centralizers are equipped with supporting devices. However, this solution has the following core technical defects: First, a single drive source cannot simultaneously achieve the "opening and self-locking" actions of the supporting device; it requires separate control of the support arm to open and then separate control of the support arm to push the rollers radially to abut against the well wall, making the operation process cumbersome. Second, the supporting structure cannot be automatically deployed downhole, and after deployment, it lacks a reliable self-locking structure, resulting in unstable support strength. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an eight-sector cement-bonded logging tool, comprising a centralizer body. Connecting caps are fixed at both the upper and lower ends of the centralizer body. The upper connecting cap is used for detachable and fixed connection to a magnetic positioning logging device, and the lower connecting cap is used for detachable and fixed connection to an eight-sector cement-bonded logging device. The centralizer body has an assembly cavity inside, and a vertically aligned assembly sleeve is fixed in the center of the assembly cavity. An electric cylinder is installed inside the assembly sleeve, and a multi-functional drive plate is fixedly connected to the power output rod of the electric cylinder. Racks are symmetrically arranged on the left and right sides of the multi-functional drive plate, and a free-stroke structure is provided between the racks and the multi-functional drive plate. The free-stroke structure is used to achieve a free-stroke relative engagement between the racks and the multi-functional drive plate. The centralizer body has symmetrically opened slots communicating with the assembly cavity on its left and right sides. Within the assembly cavity, drive arms are rotatably connected to the positions corresponding to the two slots. The rotating end of each drive arm has a toothed plate that meshes with the front end of the rack. A drive seat is fixedly connected to the multi-functional drive plate. The non-rotating end of the drive arm extends outward in a straight plate shape, and a compensating rod is slidably fitted onto it. One end of the compensating rod extends outside the non-rotating end of the drive arm, and the other end extends near the toothed plate and is fixedly connected to a trigger seat. The trigger seat is located on the movement path of the drive seat and can form a pressing fit with the drive seat. When the multi-functional drive plate drives the rack to mesh with the toothed plate, and the toothed plate drives the drive arm to rotate to a position perpendicular to the centralizer body, the drive seat presses against the two trigger seats on the left and right, causing one end of each of the two compensating rods to extend further outward and abut against the well walls on both sides.

[0006] Preferably, the upper and lower ends of the assembly cavity are provided with wire holes between the upper and lower connecting caps for connecting the electric cylinder, the magnetic positioning logging device and the eight-sector cement bonding logging device.

[0007] Preferably, the end of the drive arm away from the toothed plate extends and a mounting base is fixedly connected to its extended surface, and the compensation rod is elastically sleeved in the mounting base.

[0008] Preferably, the mounting base has a stepped hole inside, the stepped hole is polygonal, the cross section of the compensation rod is polygonal and slidably adapted to the stepped hole; a push plate is fixedly connected to the compensation rod, a first spring element is provided in the stepped hole, the first spring element is sleeved on the compensation rod, one end of which abuts against the push plate, and the other end abuts against the stepped surface of the stepped hole.

[0009] Preferably, the idle travel structure includes a slide rail, a slide block, a second spring element, and a limiting pin; the slide rail is symmetrically fixed on the left and right sides of the multi-functional drive plate, and the inner sides of the two racks are respectively fixedly connected to slide blocks, with the two slide blocks slidingly engaging with the corresponding slide rails; the slide block is provided with a second spring element, one end of which is fixedly connected to the front end of the slide block, and the other end is fixedly connected to the front end of the slide rail, so that an idle travel space is formed between the front end of the slide block and the front end of the slide rail, and the second spring element is disposed in the idle travel space; the limiting pin is fixed to the back of the toothed plate, and when the toothed plate rotates to a position where the drive arm is perpendicular to the body of the stabilizer, the limiting pin abuts against the inner wall of the assembly cavity to limit the toothed plate from continuing to rotate, thereby limiting its movement through the racks meshing with the toothed plate.

[0010] Preferably, a roller is provided at the end of the compensation rod away from the trigger seat.

[0011] Preferably, the symmetrically opened slots on the left and right sides of the centralizer body are rectangular, and the slots are connected to the assembly cavity inside the centralizer body for the drive arm to pass through and rotate.

[0012] Preferably, the trigger seat is triangular and the drive seat is circular or arc-shaped. When the two trigger seats rotate with the two drive arms to a position perpendicular to the body of the stabilizer, one of the inclined surfaces of the two trigger seats together forms a V-shaped pressure zone. The circular or arc-shaped surface of the drive seat corresponds to the V-shaped pressure zone, and the drive seat is located in the middle of the V-shaped pressure zone to symmetrically compress the two trigger seats and drive the two compensation rods to move synchronously in opposite directions through the two trigger seats.

[0013] The advantages of this invention compared to the prior art are:

[0014] This invention utilizes a single-drive-source electric cylinder and a multi-functional drive plate. The electric cylinder drives the multi-functional drive plate to perform axial linear motion, simultaneously achieving the meshing transmission between the rack and the toothed plate, as well as the pressing engagement between the drive seat and the trigger seat, enabling the left and right drive arms to unfold synchronously. Furthermore, the invention employs a free-stroke structure to achieve the continuous stroke of the multi-functional drive plate, causing the compensation rod on the drive arm to extend outward and abut against the well wall. This allows the synchronous unfolding of the drive arms and the supporting action of the compensation rod to be completed by a single drive source, simplifying the drive structure and operation process.

[0015] This invention converts the linear motion of the multi-functional drive plate into the rotational unfolding and repositioning motion of the drive arm by setting a rack linked to the multi-functional drive plate and a toothed plate fixed to the drive arm, thereby realizing the automatic synchronous unfolding and repositioning of the drive arm. It is driven by an electric cylinder, eliminating the need for manual adjustment downhole and improving the automation level of downhole operations.

[0016] This invention, by setting a drive seat fixed to the multi-functional drive plate and a trigger seat fixed to the compensation rod, utilizes the reverse force of the well wall to form a mechanical self-lock after the compensation rod abuts against the well wall. Combined with the meshing and limiting of the rack and toothed plate, the support device maintains long-term stable support, effectively resists downhole vibration and impact, and ensures accurate and reliable circumferential detection position of the eight-sector cement-bonded logging device. Attached Figure Description

[0017] Figure 1 A schematic diagram from the first perspective of an eight-sector cement-bonded logging tool provided for an embodiment of the present invention;

[0018] Figure 2 The eight-sector cement-bonded logging tool provided for embodiments of the present invention is composed of... Figure 1 Enlarged view of part A leading to the image;

[0019] Figure 3 The eight-sector cement-bonded logging tool provided for embodiments of the present invention is composed of... Figure 1 The diagram illustrates the concept from a third-person perspective;

[0020] Figure 4 A schematic diagram of the centralizer body cut open in the eight-sector cement-bonded logging tool provided in an embodiment of the present invention.

[0021] Figure 5 The eight-sector cement-bonded logging tool provided for embodiments of the present invention is composed of... Figure 4 A partial schematic diagram showing the disconnected area;

[0022] Figure 6 A schematic diagram of the eight-sector cement-bonded logging tool after longitudinal sectioning, provided for an embodiment of the present invention.

[0023] Figure 7 A schematic diagram of the internal components of the centralizer body in the eight-sector cement-bonded logging tool provided for an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the idle travel structure in the eight-sector cement-bonded logging tool provided in this embodiment of the invention after it has been removed from the multi-functional drive board.

[0025] In the diagram: 1. Centralizer body; 2. Connecting cap; 3. Magnetic positioning logging device; 4. Eight-sector cement-bonded logging device; 5. Assembly cavity; 6. Assembly sleeve; 7. Electric cylinder; 8. Multifunctional drive plate; 9. Rack; 11. Groove; 12. Drive arm; 13. Tooth plate; 14. Drive seat; 15. Compensating rod; 16. Trigger seat; 17. Wire hole; 18. Assembly seat; 19. Stepped hole; 20. Push plate; 21. First spring element; 22. Slide rail; 23. Slide seat; 24. Second spring element; 25. Limit pin; 26. Roller. Detailed Implementation

[0026] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] In one implementation, such as Figures 1-8 As shown: This embodiment provides an eight-sector cement-bonded logging tool, including a centralizer body 1. Connecting caps 2 are fixedly mounted at the upper and lower ends of the centralizer body 1. The upper connecting cap 2 is used for detachable fixed connection to a magnetic positioning logging device 3, and the lower connecting cap 2 is used for detachable fixed connection to an eight-sector cement-bonded logging device 4. An assembly cavity 5 is provided inside the centralizer body 1. A vertically aligned assembly sleeve 6 is fixedly mounted in the middle of the assembly cavity 5. An electric cylinder 7 is installed inside the assembly sleeve 6. A multi-functional drive plate 8 is fixedly connected to the power output rod of the electric cylinder 7. Racks 9 are symmetrically arranged on the left and right sides of the multi-functional drive plate 8. A free-stroke structure is provided between the racks 9 and the multi-functional drive plate 8 to achieve free-stroke relative engagement between the racks 9 and the multi-functional drive plate 8. Grooves 11 communicating with the assembly cavity 5 are symmetrically opened on the left and right sides of the centralizer body 1. Drive arms 12 are rotatably connected to the two slots 11. The rotating end of the drive arm 12 is provided with a toothed plate 13, which meshes with the front end of the rack 9. A drive seat 14 is fixedly connected to the multi-functional drive plate 8. The non-rotating end of the drive arm 12 extends outward in a straight plate shape, and a compensating rod 15 is slidably fitted on it. One end of the compensating rod 15 extends to the outside of the non-rotating end of the drive arm 12, and the other end extends to the vicinity of the toothed plate 13 and is fixedly connected to a trigger seat 16. The trigger seat 16 is located on the movement path of the drive seat 14 and can form a pressing fit with the drive seat 14. When the multi-functional drive plate 8 drives the rack 9 to mesh with the toothed plate 13, and the toothed plate 13 drives the drive arm 12 to rotate to a state perpendicular to the centralizer body 1, the drive seat 14 presses the left and right trigger seats 16, causing one end of the left and right compensating rods 15 to extend outward a further stroke and abut against the well walls on both sides.

[0028] After the instrument string is assembled, it enters the well preparation state. At this time, the electric cylinder 7 is not started, the multi-functional drive plate 8 is in the initial position, the rack 9 is not engaged with the toothed plate 13 at the rotating end of the drive arm 12, the drive arm 12 is in a retracted state and is not perpendicular to the centralizer body 1, the compensation rod 15 is retracted inside the non-rotating end of the drive arm 12, and the support device is in a retracted state. This is to avoid the support device from scraping or getting stuck with the well wall during the well process, and to ensure that the logging instrument can be successfully lowered into the well.

[0029] When the logging tool is lowered into the target well section, the support device needs to be supported against the well wall. At this time, the electric cylinder 7 in the assembly cavity 5 of the centralizer body 1 is activated. The electric cylinder 7 serves as the sole drive source, and its power output rod drives the multi-functional drive plate 8 to move vertically downward along the assembly sleeve 6. Two support actions are achieved simultaneously through a linkage structure, eliminating the need for separate independent operations. As the multi-functional drive plate 8 moves downward, the racks 9 symmetrically arranged on its left and right sides move downward synchronously. Since the front end of the rack 9 meshes with the toothed plate 13 at the rotating end of the drive arm 12, the vertical movement of the rack 9... The linear motion is converted into the rotational motion of the drive arm 12 through the toothed plate 13, which in turn drives the drive arms 12 on both sides of the centralizer body 1 to rotate outward synchronously around the rotational connection point in the assembly cavity 5. As the electric cylinder 7 continuously outputs power, the multi-functional drive plate 8 moves downward continuously, and the rack 9 continuously meshes with the toothed plate 13 for transmission, until the drive arm 12 rotates to a position perpendicular to the centralizer body 1. At this time, the drive arm 12 completes the opening action, and simultaneously drives the compensation rod 15 at its non-rotating end to extend towards the well wall, realizing the automatic opening of the support device inside the well. When the drive arm 12 rotates to a position perpendicular to the centralizer body 1, the drive seat 14 fixedly connected to the multi-functional drive plate 8 will move to the position of the trigger seat 16. Since the trigger seat 16 is fixed to the end of the compensating rod 15 near the toothed plate 13 and is located on the movement path of the drive seat 14, the electric cylinder 7 continues to output power. Through the idle stroke structure, while the left and right racks 9 stop moving, only the multi-functional drive plate 8 continues to move forward one stroke, which can drive the drive seat 14 to form a pressing fit with the left and right trigger seats 16. Under the pressure, the two compensating rods 15 on the left and right will extend outward a further distance along the non-rotating end sliding engagement direction of the drive arm 12 until one end of the compensating rod 15 extends to the outside of the drive arm 12 and abuts against the well walls on both sides of the well, completing the reliable contact between the support device and the well wall. This truly realizes the synchronous linkage of the two actions of "opening and contacting", eliminating the need to separately control the opening of the drive arm 12 and then separately control the extension and retraction of the compensating rod 15, thus completely solving the defect in the existing technology that "one drive cannot realize the synchronous opening and self-locking actions of the two support devices".When the compensating rod 15 abuts against the well wall, the electric cylinder 7 stops outputting power (the output stroke of the electric cylinder 7 is constant). At this time, the device relies on its own mechanical structure characteristics to achieve reliable self-locking. Specifically, the compensating rod 15 will be subjected to the reverse pushing force of the well wall. This force will be transmitted to the trigger seat 16, so that the trigger seat 16 and the drive seat 14 always maintain a pressing engagement state, thereby restricting the reverse movement of the multi-functional drive plate 8. If the multi-functional drive plate 8 cannot move in the reverse direction, the rack 9 cannot move in the reverse direction, and the toothed plate 13 and the drive arm 12 cannot rotate in the reverse direction. The drive arm 12 always maintains a stretched state perpendicular to the centralizer body 1, and the compensating rod 15 always maintains abutting against the well wall, forming a stable mechanical self-locking. This self-locking structure does not require additional independent self-locking components. It can be achieved solely by the linkage structure of the drive seat 14, the trigger seat 16 pressing and engaging the rack 9 and the toothed plate 13, ensuring that the support device always maintains a stable support state during downhole vibration and well wall impact. When the logging operation is completed and the logging instrument needs to be retrieved from the well, the electric cylinder 7 is activated to rotate in reverse. The power output rod of the electric cylinder 7 drives the multi-functional drive plate 8 to move in reverse, causing the drive seat 14 and the trigger seat 16 to disengage from the squeezing engagement. Under the action of the reverse force of the well wall (with an adaptive elastic reset structure to assist in reset), the compensation rod 15 slides and retracts along the drive arm 12 to the initial position. At the same time, the rack 9 moves in reverse, causing the toothed plate 13 and the drive arm 12 to rotate in opposite directions, causing the drive arm 12 to retract to the initial state. The entire support device retracts, facilitating the smooth retrieval of the logging instrument. The entire operation process is convenient and efficient. During the entire operation, the centralizer body 1 is reliably connected to the magnetic positioning logging device 3 and the eight-sector cement bonded logging device 4 through the connecting cap 2. After the support device stably presses against the well wall and self-locks, the centralizer body 1 remains fixed, thereby driving the eight-sector cement bonded logging device 4 to be close to the centerline of the well, ensuring that the distance between its eight measuring windows and the well wall and cement sheath is uniform, providing a reliable guarantee for detection accuracy.

[0030] This invention uses an electric cylinder 7 as the sole drive source. Through the coordinated operation of a multi-functional drive plate 8, rack 9, toothed plate 13, drive seat 14, and trigger seat 16, a single drive unit simultaneously opens two support devices and simultaneously extends and retracts two compensating rods 15, eliminating the need for separate control of the drive arm 12 to open and then the compensating rods 15 to extend and retract, effectively simplifying the operation process. The entire process of opening and retracting the support devices is driven by the electric cylinder 7 and mechanically linked, requiring no pre-adjustment on the ground. After the logging tool is lowered into the target well section, activating the electric cylinder 7 automatically opens and retracts the devices, adapting to complex conditions such as irregular well walls and varying well diameters, achieving automatic opening within the well without manual intervention.

[0031] This invention achieves three major functions—opening, blocking, and self-locking—simultaneously through a single linkage structure. Compared to the multiple independent drive and adjustment components required for step-by-step actions in existing technologies, the number of parts is significantly reduced, and the structure is simplified. This not only reduces the difficulty of processing and manufacturing and production costs, but also reduces the risk of jamming and damage to downhole parts, and facilitates later maintenance.

[0032] In another embodiment, the drive arm 12 extends away from the toothed plate 13 at one end, and a mounting base 18 is fixedly connected to its extended surface. The compensating rod 15 is elastically sleeved in the mounting base 18. A stepped hole 19 is provided inside the mounting base 18. The stepped hole 19 is polygonal. The cross-section of the compensating rod 15 is polygonal and is slidably adapted to the stepped hole 19. A push plate 20 is fixedly connected to the compensating rod 15. A first spring element 21 is provided in the stepped hole 19. The first spring element 21 is sleeved on the compensating rod 15, with one end abutting against the push plate 20 and the other end abutting against the stepped surface of the stepped hole 19.

[0033] The sliding fit between the polygonal stepped hole 19 and the polygonal cross-section compensation rod 15 effectively prevents the compensation rod 15 from rotating and shifting during the extension and retraction process, ensuring that the compensation rod 15 always extends and retracts in the preset direction, guaranteeing the accuracy of the contact with the well wall, and avoiding support shifting due to the rotation of the compensation rod 15. In particular, it ensures that the trigger seat 16 at the other end of the compensation rod 15 does not shift in the direction of movement of the drive seat 14, ensuring that the drive seat 14 accurately abuts against the trigger seat 16 when it moves forward, pushing the compensation rod 15 to extend towards the well wall. The cooperation between the first spring element 21, the push plate 20, and the stepped surface forms an elastic buffer or elastic reset mechanism. When the compensation rod 15 abuts against the well wall, the first spring element 21 can absorb the force generated by the downhole vibration and the impact of the well wall, avoiding damage to the compensation rod 15 and the mounting seat 18 caused by rigid contact. When the drive seat 14 moves away from the trigger seat 16, the first spring element 21 returns to its length and pushes the compensation rod 15 to retract in the opposite direction along the mounting hole of the mounting seat 18.

[0034] In another embodiment, the free-stroke structure includes a slide rail 22, a slide block 23, a second spring element 24, and a limiting pin 25. The slide rail 22 is symmetrically fixed on the left and right sides of the multi-functional drive plate 8. The inner sides of the two racks 9 are respectively fixedly connected to the slide blocks 23, and the two slide blocks 23 slide in a one-to-one sliding engagement with the slide rail 22 on the corresponding side. The slide block 23 is provided with a second spring element 24. One end of the second spring element 24 is fixedly connected to the front end of the slide block 23, and the other end is fixedly connected to the front end of the slide rail 22, so that a free-stroke space is formed between the front end of the slide block 23 and the front end of the slide rail 22. The second spring element 24 is located in the free-stroke space. The limiting pin 25 is fixed to the back of the toothed plate 13. When the toothed plate 13 rotates to drive the drive arm 12 to be perpendicular to the body 1 of the stabilizer, the limiting pin 25 abuts against the inner wall of the assembly cavity 5 to limit the toothed plate 13 from continuing to rotate, and then the movement is limited by the racks 9 that mesh with the toothed plate 13.

[0035] This embodiment is an example of an idle stroke structure, and its idle stroke principle is as follows: When the logging tool needs to deploy the support device, the electric cylinder 7 is activated and drives the multi-functional drive plate 8 to move forward. Since the slide rail 22 is fixedly connected to the multi-functional drive plate 8, the multi-functional drive plate 8 synchronously drives the slide rails 22 on both sides to move forward. The slide rails 22 then drive the second spring element 24 fixedly connected to them to move forward synchronously. When the second spring element 24 moves forward, its other end pushes the corresponding slide block 23 to move forward. Since the slide block 23 is fixedly connected to the rack 9, the slide block 23 synchronously drives the racks 9 on both sides to move forward. During the forward movement of the rack 9, its front end and the rack plate... The gears 13 mesh, causing the toothed plates 13 on both sides to rotate synchronously. When the toothed plates 13 rotate, they cause the drive arms 12 connected to them to extend outward synchronously. As the electric cylinder 7 continues to drive the multi-functional drive plate 8 forward, the drive arms 12 continue to extend until the drive arms 12 rotate to a position perpendicular to the body 1 of the stabilizer. At this time, the limiting pins 25 on the back of the toothed plates 13 just abut against the inner wall of the assembly cavity 5. At this time, the limiting pins 25 rigidly limit the toothed plates 13, restricting the toothed plates 13 from continuing to rotate. After the toothed plates 13 stop rotating, the gear rack 9 that meshes with them also stops moving forward, thereby stopping the drive arms 12 from continuing to extend, thus achieving precise limiting of the extension angle of the drive arms 12. At this time, the electric cylinder 7 continues to drive the multi-functional drive plate 8 forward. Since the rack 9 is fixedly connected to the slide 23 and has stopped moving, and the slide 23 and the slide rail 22 are in a sliding engagement relationship, the multi-functional drive plate 8 can drive the slide rail 22 to continue to move forward along the slide 23 in the empty stroke space for a period of time. During this process, the relative sliding between the slide rail 22 and the slide 23 will cause the second spring element 24 between them to be compressed and shortened. Through the compression deformation of the second spring element 24, the multi-functional drive plate 8 can be satisfied to continue to move forward in the empty stroke space. Moreover, this forward movement will not destroy the meshing relationship between the rack 9 and the toothed plate 13. The rack 9 and the toothed plate 13 always maintain a stable meshing state. Simultaneously, the second spring element 24, when compressed, generates a reverse elastic support force. This support force acts on the slide block 23 and the rack 9, providing sufficient force to prevent the rack 9 from retracting, thereby ensuring the meshing stability of the rack 9 and the toothed plate 13. This ensures that the drive arm 12 remains in a perpendicular, extended state to the centralizer body 1, achieving reliable self-locking. Meanwhile, the continued forward movement of the multi-functional drive plate 8 within its idle travel space synchronously drives its fixedly connected drive seat 14 to move towards the two trigger seats 16 on the left and right until the drive seat 14 and the two trigger seats 16 form a pressing fit. This then pushes the two trigger seats 16 to move synchronously, causing the fixedly connected compensating rod 15 to extend outward, ultimately completing the supporting action of the compensating rod 15 against the well wall. This ensures both the accuracy of the drive arm 12's unfolding angle and the smooth completion of the compensating rod 15's contact action, requiring no additional power and achieving a seamless connection between two actions driven by a single drive.

[0036] In another embodiment, a roller 26 is provided at the end of the compensating rod 15 away from the trigger seat 16. After the compensating rod 15 is subjected to force, it is pushed against the well wall by the roller 26, which improves the stability and enables the device to roll displacement when it rises and changes the detection position. Compared with the prior art, after use, the roller 26 can be recycled back into the slot 11 along with the compensating rod 15 or recycled back into the centralizer body 1 from the slot 11.

[0037] In another embodiment, the slots 11 symmetrically opened on the left and right sides of the centralizer body 1 are rectangular, and the rectangular slots 11 are connected to the assembly cavity 5 inside the centralizer body 1, for the drive arm 12 to pass through and rotate, and also for the drive arm 12 to rotate and be stored.

[0038] In another embodiment, the trigger seat 16 is triangular and the drive seat 14 is circular or arc-shaped. When the two trigger seats 16 rotate with the two drive arms 12 to a state perpendicular to the body 1 of the centralizer, one of the inclined surfaces of the two trigger seats 16 together forms a V-shaped pressure area. The circular or arc-shaped surface of the drive seat 14 corresponds to the V-shaped pressure area, and the drive seat 14 is located in the middle of the V-shaped pressure area to symmetrically squeeze the two trigger seats 16, and drive the two compensation rods 15 to move synchronously in opposite directions through the two trigger seats 16.

[0039] This embodiment defines the shapes of the left and right trigger seats 16 and the drive seat 14. When the two drive arms 12 rotate to a position perpendicular to the centralizer body 1, the inclined surfaces of the two trigger seats 16 together form a V-shaped pressure zone. The drive seat 14 is located in the middle of the opening of the V-shaped pressure zone, and its circular / arc working surface is directly opposite the V-shaped pressure zone. When the drive seat 14 moves axially into the V-shaped pressure zone with the multi-functional drive plate 8, it forms a synchronous pressing fit with the inclined surfaces of the two trigger seats 16, converting the axial linear motion into radially opposite linear motion of the two trigger seats 16, driving the two compensating rods 15 to extend synchronously, so that the matrix cone-shaped bodies at the outer ends of the compensating rods 15 synchronously abut against the two well walls.

[0040] In another embodiment, wiring holes 17 are provided at both ends of the assembly cavity 5 and between the upper and lower connecting caps 2, for connecting the wiring to the electric cylinder 7, the magnetic positioning logging device 3 and the eight-sector cement bonding logging device 4.

[0041] It should be further explained that in the prior art, depending on the cascade length of the logging tool, multiple sets of centralizer bodies 1 are used to connect the relevant detection devices. Therefore, the longer the cascade length, the more centralizer bodies 1 are required, and each centralizer body 1 is equipped with two sets of the aforementioned support structures on the left and right sides. The present invention is similar; even if the instrument cascade length is long, it can be connected using multiple sets of centralizer bodies 1, with two sets of the aforementioned support devices symmetrically arranged on each centralizer body 1. This allows the support devices to simultaneously open and abut against the well wall, thereby improving the stability of the instrument during downhole operation. Even with a large number of centralizer bodies 1, the present invention, compared to the prior art, still enables non-manual support operations downhole.

[0042] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0043] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An eight-sector cement-bonded logging tool, comprising a centralizer body (1), wherein connecting caps (2) are fixedly provided at the upper and lower ends of the centralizer body (1), the upper connecting cap (2) being used for detachably and fixedly connecting a magnetic positioning logging device (3), and the lower connecting cap (2) being used for detachably and fixedly connecting an eight-sector cement-bonded logging device (4), characterized in that: The body (1) of the centralizer has an assembly cavity (5) inside. A vertically aligned assembly sleeve (6) is fixed in the middle of the assembly cavity (5). An electric cylinder (7) is installed in the assembly sleeve (6). A multi-functional drive plate (8) is fixedly connected to the power output rod of the electric cylinder (7). A rack (9) is symmetrically arranged on the left and right sides of the multi-functional drive plate (8). A free stroke structure is provided between the rack (9) and the multi-functional drive plate (8). The free stroke structure is used to realize the free stroke relative cooperation between the rack (9) and the multi-functional drive plate (8). The body (1) of the centralizer has symmetrical slots (11) that communicate with the assembly cavity (5) on the left and right sides. A drive arm (12) is rotatably connected to the two slots (11) in the assembly cavity (5). A toothed plate (13) is provided at the rotating end of the drive arm (12). The toothed plate (13) meshes with the front end of the rack (9). The multi-functional drive plate (8) is fixedly connected to a drive seat (14). The non-rotating end of the drive arm (12) extends outward in a straight plate shape, and a compensation rod (15) is slidably fitted on it. One end of the compensation rod (15) extends to the outside of the non-rotating end of the drive arm (12), and the other end extends to the vicinity of the toothed plate (13) and is fixedly connected to a trigger seat (16). The trigger seat (16) is located on the movement path of the drive seat (14) and can form a squeezing fit with the drive seat (14). When the multi-functional drive plate (8) drives the rack (9) to mesh with the toothed plate (13), and the toothed plate (13) drives the drive arm (12) to rotate to a position perpendicular to the centralizer body (1), the drive seat (14) squeezes the two trigger seats (16) on the left and right, so that one end of the two compensation rods (15) on the left and right extends outward for a further stroke and abuts against the well walls on both sides. The idle travel structure includes a slide rail (22), a slide block (23), a second spring element (24), and a limiting pin (25). The slide rail (22) is symmetrically fixed on the left and right sides of the multi-functional drive plate (8). The inner sides of the two racks (9) are respectively fixedly connected to the slide blocks (23), and the two slide blocks (23) slide in a one-to-one correspondence with the slide rails (22) on the corresponding sides. The slide block (23) is provided with a second spring element (24). One end of the second spring element (24) is fixedly connected to the front end of the slide block (23), and the other end is connected to the slide rail. (22) is fixedly connected to the front end, so that a free travel space is formed between the front end of the slide block (23) and the front end of the slide rail (22). The second spring element (24) is located in the free travel space. The limiting pin (25) is fixed on the back of the toothed plate (13). When the toothed plate (13) rotates to drive the drive arm (12) to be perpendicular to the body of the stabilizer (1), the limiting pin (25) abuts against the inner wall of the assembly cavity (5) to limit the toothed plate (13) from continuing to rotate, and then the movement is limited by the rack (9) meshing with the toothed plate (13).

2. The eight-sector cement-bonded logging tool according to claim 1, characterized in that, The assembly cavity (5) has wire holes (17) at both ends and between the upper and lower connecting caps (2) for connecting the lines to the electric cylinder (7), the magnetic positioning logging device (3) and the eight-sector cement bonding logging device (4).

3. The eight-sector cement-bonded logging tool according to claim 2, characterized in that, The drive arm (12) extends away from the toothed plate (13) at one end, and a mounting base (18) is fixedly connected to its extension surface. The compensation rod (15) is elastically sleeved in the mounting base (18).

4. The eight-sector cement-bonded logging tool according to claim 3, characterized in that, The mounting base (18) has a stepped hole (19) inside. The stepped hole (19) is polygonal. The cross section of the compensation rod (15) is polygonal and is slidably adapted to the stepped hole (19). A push plate (20) is fixedly connected to the compensation rod (15). A first spring element (21) is provided in the stepped hole (19). The first spring element (21) is sleeved on the compensation rod (15). One end of the first spring element (21) abuts against the push plate (20), and the other end abuts against the stepped surface of the stepped hole (19).

5. The eight-sector cement-bonded logging tool according to claim 4, characterized in that, A roller (26) is provided at the end of the compensation rod (15) away from the trigger seat (16).

6. The eight-sector cement-bonded logging tool according to claim 5, characterized in that, The slots (11) symmetrically opened on the left and right sides of the centralizer body (1) are rectangular, and the slots (11) are connected to the assembly cavity (5) inside the centralizer body (1) for the drive arm (12) to pass through and rotate.

7. The eight-sector cement-bonded logging tool according to claim 6, characterized in that, The trigger seat (16) is triangular, and the drive seat (14) is circular or arc-shaped. When the two trigger seats (16) rotate with the two drive arms (12) to a state perpendicular to the body (1) of the stabilizer, one of the inclined surfaces of the two trigger seats (16) together forms a V-shaped pressure area. The circular or arc-shaped surface of the drive seat (14) corresponds to the V-shaped pressure area, and the drive seat (14) is located in the middle of the V-shaped pressure area to symmetrically squeeze the two trigger seats (16) and drive the two compensation rods (15) to move synchronously in opposite directions through the two trigger seats (16).

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