Dual mode cementing quality logging tool

Abstract

The application relates to the technical field of cementing quality detection, and provides a double-mode cementing quality logging instrument, which comprises a crawler body, an acoustic wave machine head, an ultrasonic detection rod, an ultrasonic machine head and a shielding assembly. An assembly hole is arranged in the crawler body, the bottom end of the assembly hole is sequentially connected with the acoustic wave machine head and a rotating disc, the ultrasonic detection rod is rotationally arranged in the assembly hole, the bottom end of the ultrasonic detection rod sequentially penetrates through the rotating disc and the acoustic wave machine head and extends to the outside, and the ultrasonic detection rod is fixedly connected with the ultrasonic machine head. The acoustic wave machine head is fixedly connected to the bottom end of the crawler body, and an acoustic wave probe is inlaid in the outer wall of the acoustic wave machine head. The two kinds of acoustic signal interference are precisely blocked, the detection operation is not affected during contraction, the shielding effect and the detection efficiency are considered, the instrument is adapted to complex downhole conditions, the actual needs of precise cementing quality detection of deep and complex strata are met, and the working stability and the industrial practicability of the logging instrument are improved.

Description

Technical Field

[0001] This invention relates to the field of cementing quality testing technology, and in particular to a dual-mode cementing quality logging instrument. Background Technology

[0002] Cementing operations are a crucial part of oil and gas drilling engineering, and their quality directly determines the production life, extraction safety, and economic benefits of oil and gas wells. Cementing quality logging is the core means of verifying cementing effectiveness and identifying potential defects. As oil and gas exploration and development advances to deeper and more complex formations, higher demands are placed on the accuracy and efficiency of cementing quality testing, and single testing methods are no longer sufficient to meet practical engineering needs. Currently, the industry widely adopts dual-mode logging technology that combines acoustic and ultrasonic testing. The acoustic probe of the acoustic logging head detects cement bond strength, while the ultrasonic probe detects cement defects in the wellbore using ultrasonic testing. The two work together to achieve a comprehensive and accurate assessment of cementing quality, and the corresponding dual-mode cementing quality logging tool has become one of the core testing equipment in the oil and gas exploration field. This type of logging tool typically uses a crawler body to carry acoustic and ultrasonic components downhole, and the ultrasonic testing rod drives the ultrasonic probe to rotate, achieving full wellbore coverage testing.

[0003] However, existing dual-mode cementing quality logging tools suffer from a key technical deficiency in practical applications: the acoustic and ultrasonic probes are installed adjacent to each other, leading to signal crosstalk during operation. This interference between the acoustic and ultrasonic signals causes data deviations, making it difficult to accurately distinguish between cement bonding defects and errors caused by signal interference, thus affecting detection accuracy. Therefore, effectively shielding the acoustic and ultrasonic probes to avoid crosstalk has become a core problem that urgently needs to be solved in current dual-mode cementing quality logging tools. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a dual-mode cementing quality logging tool, comprising a crawler body, an acoustic head, an ultrasonic testing rod, an ultrasonic sensor, and a shielding assembly. The crawler body has an assembly hole, the bottom of which sequentially passes through the acoustic head and a rotary table. The ultrasonic testing rod is rotatably disposed within the assembly hole, its bottom end passing through the rotary table and the acoustic head and extending to the outside, and is fixedly connected to the ultrasonic head. The acoustic head is fixedly connected to the bottom of the crawler body, and an acoustic probe is embedded in the outer wall of the acoustic head. The rotary table is rotatably connected to the bottom of the acoustic head. The ultrasonic sensor... An ultrasonic probe is embedded in the outer wall, located below the acoustic wave probe. The shielding assembly includes a toothed ring, multiple rotating heads, multiple gears, multiple swing arms, and multiple flexible shielding strips. The toothed ring is fixedly connected to the ultrasonic head. Multiple rotating heads are arranged in a ring array around the periphery of the ultrasonic head and are rotatably connected to the bottom end of the acoustic wave probe. Each rotating head is fixedly mounted with a gear that meshes with the toothed ring. Each rotating head is fixedly connected with a swing arm, and a flexible shielding strip connects two adjacent swing arms. The flexible shielding strip has an acoustic isolation structure to block signal crosstalk between the acoustic wave probe and the ultrasonic probe. When the ultrasonic head drives the gear ring to rotate, the gear ring drives each gear and the rotating head to rotate, and the rotating head drives the swing arm to swing, so that the flexible shielding strip switches between the expanded state and the contracted state. When the flexible shielding strip is in the expanded state, it forms an isolation barrier surrounding the acoustic probe and the ultrasonic probe, thereby achieving acoustic signal isolation between the two probes.

[0005] More preferably, the surface of the flexible shielding strip is adhered with an acoustic isolation material layer, the acoustic isolation material layer including at least one of sound insulation material, sound absorption material or acoustic impedance matching layer.

[0006] More preferably, the flexible shielding strip, when unfolded, forms a ring-shaped barrier, covering the upper outer side of the ultrasonic head and located between the acoustic probe and the ultrasonic probe.

[0007] In a further preferred embodiment, the turntable is arranged coaxially with the ultrasonic head, and the ultrasonic testing rod rotates coaxially with the turntable and the ultrasonic head.

[0008] Further preferably, it also includes a limiting structure for limiting the rotation angle of the rotating head; the limiting structure includes multiple arc-shaped relief grooves and multiple limiting shafts, the multiple arc-shaped relief grooves correspond one-to-one with the multiple rotating heads and are formed on the bottom surface of the ultrasonic head, the arc-shaped relief grooves are arranged around the periphery of the rotating head; each rotating head is fixedly connected to a limiting shaft on its periphery, the end of the limiting shaft away from the rotating head is slidably embedded in the corresponding arc-shaped relief groove and can slide along the extension direction of the arc-shaped relief groove to limit the rotation stroke of the rotating head. When the ultrasonic head rotates a full circle, it drives the turntable to rotate synchronously, and when the ultrasonic head rotates in the forward or reverse direction to drive the flexible shielding strip to open or close, the rotation stroke of the rotating head is limited and does not hinder the full circle rotation of the ultrasonic head and the detection of cement defects in the well wall by the ultrasonic probe.

[0009] More preferably, the center of the arc-shaped relief groove coincides with the rotation axis of the corresponding rotating head, and the central angle of the arc-shaped relief groove is 30°-60°.

[0010] In a further preferred embodiment, a wear-resistant sleeve is rotatably fitted at the end of the limiting shaft away from the rotating head, and the wear-resistant sleeve slides and fits against the inner wall of the arc-shaped relief groove.

[0011] In a further preferred embodiment, the inner wall of the arc-shaped relief groove is provided with a lubrication groove, the lubrication groove is filled with solid grease, and the limiting shaft is correspondingly arranged with the lubrication groove and in contact with the solid grease.

[0012] The advantages of this invention compared to the prior art are: The crawler body carries the ultrasonic probe, ultrasonic testing rod, ultrasonic head, and shielding assembly to complete downhole cementing quality inspection. It comprehensively covers the inspection needs for cement bond strength and wellbore cement defects, significantly improving the comprehensiveness and accuracy of cementing quality inspection compared to single inspection methods. A shielding assembly is installed between the ultrasonic and acoustic probes, employing a linkage between a turntable, gears, gear rings, and a rotating head. When the ultrasonic probe rotates to a certain angle, the meshing relationship between the gear ring and the gear pulley expands the flexible shielding strip in the shielding assembly, forming an isolation barrier between the ultrasonic and acoustic probes. This effectively solves the problem of excessive crosstalk between the acoustic and ultrasonic probes in existing dual-mode logging tools, precisely blocking interference from both types of acoustic signals. The retraction does not affect the inspection operation, balancing shielding effectiveness and inspection efficiency. It is adaptable to complex downhole conditions, meeting the actual needs of accurate cementing quality inspection in deep and complex formations, and improving the working stability and industrial applicability of the logging tool. In addition, the shielding components are linked to the rotation of the ultrasonic head, eliminating the need for an additional drive mechanism. This simplifies the overall structure of the equipment, reduces manufacturing costs and maintenance difficulty, and the flexible shielding strip can be flexibly switched between opening and closing. When opened, it forms a surrounding isolation barrier, and when closed, it provides reasonable protection and storage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the dual-mode cementing quality logging tool provided in an embodiment of the present invention, taken from a first-view perspective and partially cut open. Figure 2 The dual-mode cementing quality logging instrument provided for embodiments of the present invention is composed of Figure 1 Enlarged view of part A leading to the image; Figure 3 A schematic diagram of the dual-mode cementing quality logging instrument provided in an embodiment of the present invention from a second perspective. Figure 4 The dual-mode cementing quality logging instrument provided for embodiments of the present invention is composed of Figure 3 Enlarged view of section B; Figure 5 A schematic diagram from a third-view perspective of the dual-mode cementing quality logging tool provided in an embodiment of the present invention; Figure 6 The dual-mode cementing quality logging instrument provided for embodiments of the present invention is composed of Figure 5 Enlarged view of section C; Figure 7 A partial structural schematic diagram of the dual-mode cementing quality logging instrument provided for an embodiment of the present invention; Figure 8 This is a schematic diagram of the assembly of the dual-mode cementing quality logging tool provided in the embodiments of the present invention, which is limited to the position axis and the wear-resistant sliding sleeve.

[0014] In the diagram: 1. Crawler body; 101. Assembly hole; 2. Acoustic head; 201. Acoustic probe; 3. Ultrasonic testing rod; 4. Ultrasonic head; 401. Ultrasonic probe; 5. Turntable; 6. Gear ring; 7. Rotating head; 8. Gear; 9. Swing arm; 10. Flexible shielding strip; 11. Arc-shaped clearance groove; 12. Limiting shaft; 13. Wear-resistant sliding sleeve. Detailed Implementation

[0015] 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.

[0016] In one implementation, such as Figures 1-8 As shown: This embodiment provides a dual-mode cementing quality logging tool, including a crawler body 1, an acoustic head 2, an ultrasonic testing rod 3, an ultrasonic head 4, and a shielding assembly. The crawler body 1 has an assembly hole 101, the bottom end of which passes through the acoustic head 2 and a turntable 5. The ultrasonic testing rod 3 is rotatably disposed within the assembly hole 101, its bottom end passing through the turntable 5 and the acoustic head 2 and extending to the outside, where it is fixedly connected to the ultrasonic head 4. The acoustic head 2 is fixedly connected to the bottom end of the crawler body 1, and an acoustic probe 201 is embedded in its outer wall. The turntable 5 is rotatably connected to the bottom end of the acoustic head 2. An ultrasonic probe 401 is embedded in the outer wall of the ultrasonic head 4. 1. The ultrasonic probe 401 is located below the acoustic probe 201; the shielding assembly includes a toothed ring 6, multiple rotating heads 7, multiple gears 8, multiple swing arms 9, and multiple flexible shielding strips 10; the toothed ring 6 is fixedly connected to the ultrasonic head 4; the multiple rotating heads 7 are arranged in a ring array around the ultrasonic head 4 and are rotatably connected to the bottom end of the acoustic head 2; each rotating head 7 is fixedly mounted with a gear 8, which meshes with the toothed ring 6; each rotating head 7 is fixedly connected with a swing arm 9, and a flexible shielding strip 10 is connected between two adjacent swing arms 9; the flexible shielding strip 10 is provided with an acoustic isolation structure to block signal crosstalk between the acoustic probe 201 and the ultrasonic probe 401; When the ultrasonic head 4 drives the gear ring 6 to rotate, the gear ring 6 drives each gear 8 and the rotating head 7 to rotate. The rotating head 7 drives the swing arm 9 to swing, so that the flexible shielding strip 10 switches between the open state and the contracted state. When the flexible shielding strip 10 is in the expanded state, it forms an isolation barrier surrounding the acoustic probe 201 and the ultrasonic probe 401, thereby achieving acoustic signal isolation between the two probes.

[0017] Before the equipment is put into operation, all components are assembled. The crawler body 1 serves as the overall load-bearing foundation, with the assembly hole 101 inside extending to the bottom, providing stable installation and rotation guidance for the ultrasonic testing rod 3, ensuring the rotation accuracy of the ultrasonic testing rod 3. The acoustic head 2 is fixedly connected to the bottom of the crawler body 1, and the acoustic probes 201 embedded in its outer wall are evenly distributed for all-round detection of the cement bonding strength in the well. The turntable 5 is rotatably connected to the bottom of the acoustic head 2 and is coaxially arranged with the ultrasonic head 4. When the ultrasonic head 4 rotates with the ultrasonic testing rod 3, it drives the turntable 5 to rotate synchronously. The rotational force of the ultrasonic testing rod 3 and the specific extension power of the crawler body 1 mentioned here are mature technologies of existing cementing quality logging tools and do not need to be elaborated. After the equipment is started, the crawler body 1, carrying the ultrasonic head 2, ultrasonic testing rod 3, ultrasonic head 4, and shielding components, slowly enters the designated logging position downhole. Then, the ultrasonic testing rod 3 begins to rotate coaxially relative to the mounting hole 101, the turntable 5, and the ultrasonic head 2. Since the bottom end of the ultrasonic testing rod 3 is fixedly connected to the ultrasonic head 4, it drives the ultrasonic head 4 to rotate synchronously. The ultrasonic probe 401 on the outer wall of the ultrasonic head 4 also rotates slowly, achieving full-circumference coverage detection of cement defects in the well wall. Simultaneously, the crawler body 1 descends at a uniform speed to change the detection position. Meanwhile, the ultrasonic head 2 remains stationary, and its internal ultrasonic probe 201 starts synchronously, continuously detecting the cement bonding strength of the well wall, achieving coordinated operation of the two detection methods. The core technology of this invention lies in the following: the rotation of the shielding component and the ultrasonic head 4 are linked and controlled; the toothed ring 6 is fixedly sleeved on the outer wall of the ultrasonic head 4 and rotates synchronously with the ultrasonic head 4; multiple rotating heads 7 are evenly distributed in a ring array around the ultrasonic head 4 and are all rotatably connected to the bottom end of the acoustic head 2; each rotating head 7 is fixedly mounted with a gear 8, and all gears 8 mesh with the toothed ring 6 to form a synchronous transmission structure; each rotating head 7 is also fixedly connected with a swing arm 9, and a flexible shielding strip 10 is fixedly connected between two adjacent swing arms 9; multiple flexible shielding strips 10 can be spliced ​​together to form a ring structure, and the flexible shielding strip 10 is provided with an acoustic isolation structure to block the propagation of sound wave signals and ultrasonic signals.Therefore, when the ultrasonic head 4 rotates forward or backward, it drives the gear ring 6 to rotate synchronously. The gear ring 6 drives all gears 8 to rotate synchronously through meshing. The gears 8 drive the corresponding rotating head 7 to rotate around its own rotation axis. When the rotating head 7 rotates, it drives the swing arm 9 fixed to it to swing synchronously. During the swinging process, the swing arm 9 pulls the flexible shielding strip 10 between adjacent swing arms 9, so that the flexible shielding strip 10 can flexibly switch between the open state and the contracted state. Among them, when the flexible shielding strip 10 is in the open state, it forms a complete ring-shaped isolation barrier. The outer circle of this barrier becomes larger after the swing arm 9 swings around and is close to the well wall. The isolation range of this isolation barrier directly hits the well wall, which improves the isolation effect between the sound wave probe 201 and the ultrasonic probe 401, so as to achieve the sound signal isolation of the two probes. When shielding is not required, the ultrasonic head 4 can be rotated in the opposite direction to drive the swing arm 9 to swing in the opposite direction, so that the flexible shielding strip 10 can be folded and contracted without affecting the normal lifting of the equipment, and also to form a protective and reasonable storage of the flexible shielding strip 10. When the flexible shielding strip 10 is unfolded, it forms a ring barrier, covering the outer side of the ultrasonic head 4 and located between the acoustic probe 201 and the ultrasonic probe 401.

[0018] The technical effects of the above-mentioned structural design of the present invention are as follows: By optimizing the connection relationship and working linkage logic of each component, not only is the coordinated work of acoustic detection and ultrasonic detection realized to ensure the comprehensiveness and coverage of cementing quality detection, but more importantly, by reasonably setting the shielding components, the problem of excessive crosstalk between acoustic probe 201 and ultrasonic probe 401 in the prior art is effectively solved, making the images fed back to the terminal after detection by the two probes more accurate. The shielding component is linked to the rotation of the ultrasonic head 4, eliminating the need for an additional drive mechanism, simplifying the equipment structure, and reducing manufacturing costs and maintenance difficulty. The flexible shielding strip 10 can flexibly switch between open and closed states. When open, it forms a surrounding isolation barrier, precisely blocking the mutual interference of the two acoustic signals. This ensures that the cement bonding strength data detected by the acoustic probe 201 and the well wall cement defect data detected by the ultrasonic probe 401 are both accurate and reliable, significantly improving the accuracy of cementing quality logging. At the same time, the structural design of the flexible shielding strip 10 is adapted to the complex downhole environment. It will not affect the full-circumference rotation detection of the ultrasonic head 4, nor will it obstruct the detection range of the acoustic probe 201. It balances shielding effect and detection efficiency, meeting the actual needs of accurate cementing quality detection.

[0019] It should be further explained that the rotational connection between the turntable 5 and the ultrasonic head 2 adopts a conventional industrial-grade rotational assembly structure, without the need for additional complex drive components. For example, an annular mounting groove for the turntable 5 is pre-set at the bottom of the ultrasonic head 2, and the inner wall of the groove is machined with a smooth and wear-resistant surface to reduce rotational friction. An annular boss is correspondingly set at the upper end of the turntable 5, and the size of the boss precisely matches the annular groove at the bottom of the ultrasonic head 2, with the outer wall of the boss fitting against the inner wall of the groove. The annular boss of the turntable 5 is embedded into the annular groove of the ultrasonic head 2, and a small amount of solid grease is applied to the mating surface during assembly. A through hole is opened in the center of the turntable 5, and the size of the through hole is larger than the outer diameter of the ultrasonic testing rod 3. The ultrasonic testing rod 3 passes through the through hole and the ultrasonic head 2 in sequence and is fixedly connected to the ultrasonic head 4. The limiting effect of the ultrasonic testing rod 3 prevents radial displacement of the turntable 5 after assembly, ensuring that the turntable 5, the ultrasonic head 4, and the ultrasonic testing rod 3 are arranged coaxially. This rotating connection method is a common mechanical technique and does not need to be described in detail in the attached drawings. Similarly, the rotating connection method of the rotating head 7 is also subject to this explanation.

[0020] In another embodiment, the surface of the flexible shielding strip 10 is adhered with an acoustic isolation material layer, which includes at least one of a sound insulation material, a sound absorption material, or an acoustic impedance matching layer.

[0021] In this embodiment, the acoustic isolation structure of the flexible shielding strip 10 is optimized. By attaching an acoustic isolation material layer to its surface, the acoustic signal blocking capability is further enhanced. When the flexible shielding strip 10 is expanded to form a ring-shaped isolation barrier, the acoustic isolation material layer can selectively absorb or reflect the acoustic signals generated by the acoustic probe 201 and the ultrasonic probe 401, preventing the acoustic signals from penetrating the flexible shielding strip 10 and forming crosstalk. The acoustic isolation material layer further improves the acoustic isolation performance of the flexible shielding strip 10. According to the actual acoustic interference intensity downhole, sound insulation, sound absorption, or acoustic impedance matching materials can be selected to achieve precise blocking of acoustic signals of different frequencies, further reducing the probability of signal crosstalk and improving the accuracy of detection data. At the same time, the acoustic isolation material layer is attached to the upper and lower surfaces of the flexible shielding strip 10, without changing the flexibility and switching flexibility of the flexible shielding strip 10, without increasing the overall size and weight of the equipment, and without affecting its folding or unfolding.

[0022] High-density sound insulation felt (mainly composed of odorless EPDM rubber and various organic minerals refined in proportion) can be used for sound insulation materials; glass fiber (mainly composed of silicon dioxide, aluminum oxide, etc.) can be used for sound absorption materials; butyl rubber, silicone rubber and other flexible materials can be used for sound impedance matching layers to achieve precise blocking of sound signals of different frequencies and further reduce the probability of signal crosstalk.

[0023] In another embodiment, a limiting structure is also included to limit the rotation angle of the rotating head 7. The limiting structure includes multiple arc-shaped relief grooves 11 and multiple limiting shafts 12. The multiple arc-shaped relief grooves 11 correspond one-to-one with the multiple rotating heads 7 and are formed on the bottom surface of the ultrasonic head 4. The arc-shaped relief grooves 11 are arranged around the periphery of the rotating head 7. A limiting shaft 12 is fixedly connected to the periphery of each rotating head 7. The end of the limiting shaft 12 away from the rotating head 7 is slidably embedded in the corresponding arc-shaped relief groove 11 and can slide along the extension direction of the arc-shaped relief groove 11 to limit the rotation stroke of the rotating head 7. When the ultrasonic head 4 rotates a full circle, it drives the turntable 5 to rotate synchronously. When the ultrasonic head 4 rotates in the forward or reverse direction to drive the flexible shielding strip 10 to open or close, the rotation stroke of the rotating head 7 is limited and does not hinder the full circle rotation of the ultrasonic head 4 and the detection of cement defects in the well wall by the ultrasonic probe 401.

[0024] When the equipment is working, the ultrasonic head 4 rotates, driving the gear ring 6 to rotate synchronously. The gear ring 6 drives the gear 8 and the rotating head 7 to rotate, thereby driving the swing arm 9 and the flexible shielding strip 10 to switch states. During this process, the limiting shaft 12 on the periphery of the rotating head 7 is always embedded in the arc-shaped relief groove 11 corresponding to the bottom surface of the ultrasonic head 4. As the rotating head 7 rotates, it slides along the extension direction of the arc-shaped relief groove 11. The length of the arc-shaped relief groove 11 limits the sliding range of the limiting shaft 12, thereby precisely limiting the rotation angle and stroke of the rotating head 7. When the ultrasonic head 4 rotates forward, driving the flexible shielding strip 10 to expand, the rotating head 7 rotates until the limiting shaft 12 abuts against one end of the arc-shaped relief groove 11, at which point it can no longer rotate. At this point, the flexible shielding strip 10 reaches its maximum expansion state, forming a complete annular isolation barrier. Since the ultrasonic probe 401 needs to rotate while simultaneously detecting, the ultrasonic head 4 must continuously rotate circumferentially within the well wall area, carrying the ultrasonic probe 401. At this time, the limiting shaft 12, abutting against one end of the arc-shaped relief groove 11, is already at its maximum stroke, thus limiting the rotation of the rotating head 7. The rotating head 7 then limits the rotation of the corresponding gear 8. This limiting force is transmitted to the turntable 5, forcing the turntable 5 to rotate with the ultrasonic head 4, thus not affecting the continuous rotation of the ultrasonic head 4 carrying the ultrasonic probe 401. It does not affect the ultrasonic probe 401's circumferential inspection of the well wall, ensuring that the ultrasonic probe 401 can achieve full well wall coverage inspection.

[0025] The addition of a limiting structure effectively solves the problem of uncontrolled rotation angle of the rotating head 7 in existing shielding components. Through the cooperation of the arc-shaped clearance groove 11 and the limiting shaft 12, the rotation stroke of the rotating head 7 is precisely limited, preventing excessive rotation of the rotating head 7 from causing deformation of the swing arm 9 and stretching damage to the flexible shielding strip 10. At the same time, the limiting structure ensures that the flexible shielding strip 10 can reach the preset annular barrier state each time it is expanded, and can accurately reset when it is contracted, ensuring the stability and consistency of the shielding effect. This avoids acoustic signal crosstalk caused by insufficient expansion angle of the flexible shielding strip 10, or incomplete contraction that blocks the detection range of the ultrasonic probe 401. In addition, the limiting structure is simple, requiring only an arc-shaped clearance groove 11 to be opened on the bottom surface of the ultrasonic head 4 and the limiting shaft 12 to be fixed on the rotating head 7. No additional complex drive or control components are needed, and the original working logic of the ultrasonic head 4 is not changed.

[0026] In another embodiment, the center of the arc-shaped relief groove 11 coincides with the rotation axis of the corresponding rotating head 7, and the central angle of the arc-shaped relief groove 11 is 30°-60°.

[0027] This angle range perfectly matches the rotation angle of the rotating head 7 required for the flexible shielding strip 10 to fully contract and fully expand. When the rotating head 7 rotates to the maximum stroke corresponding to the central angle, the flexible shielding strip 10 reaches a complete annular barrier state. This avoids insufficient expansion and poor shielding effect due to an excessively small central angle, and also prevents excessive rotation of the rotating head 7, which could damage the swing arm 9 and the flexible shielding strip 10 due to excessive tension. In addition, the concentrically set arc-shaped clearance groove 11 ensures that the limiting shaft 12 remains tightly fitted to the groove wall during sliding, resulting in higher limiting accuracy. This adapts to the rotation detection action of the ultrasonic head 4 without affecting the overall operation of the equipment.

[0028] In another embodiment, a wear-resistant sleeve 13 is rotatably fitted at the end of the limiting shaft 12 away from the rotating head 7, and the wear-resistant sleeve 13 slides and fits against the inner wall of the arc-shaped relief groove 11.

[0029] The wear-resistant sliding sleeve 13 has good wear resistance, high temperature resistance, and high pressure resistance. It can adapt to complex environments such as high temperature, high pressure, vibration, and dust in the well. It avoids wear and deformation of the inner wall of the limiting shaft 12 or the arc-shaped relief groove 11 due to long-term friction, ensuring that the limiting shaft 12 slides smoothly without jamming. This ensures the accuracy and stability of the rotation stroke of the rotating head 7, and does not affect the switching effect of the flexible shielding strip 10 and the detection operation of the ultrasonic probe 401.

[0030] In another embodiment, the inner wall of the arc-shaped relief groove 11 is provided with a lubrication groove, which is filled with solid grease. The limiting shaft 12 is correspondingly arranged with the lubrication groove and is in contact with the solid grease.

[0031] This implementation method further optimizes the anti-jamming measures based on the limiting structure and the arc-shaped relief groove, providing good sliding conditions for the wear-resistant sliding sleeve. By adding a lubrication groove and filling it with solid grease, it forms a double lubrication protection with the wear-resistant sliding sleeve 13, further optimizing the sliding fit performance between the limiting shaft 12 and the arc-shaped relief groove 11 to meet the needs of high-frequency limiting and linkage work.

[0032] 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.

[0033] 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. A dual-mode cementing quality logging tool, comprising a crawler body (1), an acoustic head (2), an ultrasonic testing rod (3), an ultrasonic head (4), and a shielding assembly; characterized in that: The crawler body (1) is provided with an assembly hole (101), the bottom end of which passes through the acoustic head (2) and the turntable (5) in sequence; the ultrasonic testing rod (3) is rotatably disposed in the assembly hole (101), the bottom end of which passes through the turntable (5) and the acoustic head (2) in sequence and extends to the outside, and is fixedly connected to the ultrasonic head (4); the acoustic head (2) is fixedly connected to the bottom end of the crawler body (1), and the acoustic head (2) An acoustic probe (201) is embedded in the outer wall of the ultrasonic head (2); the turntable (5) is rotatably connected to the bottom end of the ultrasonic head (2); an ultrasonic probe (401) is embedded in the outer wall of the ultrasonic head (4), and the ultrasonic probe (401) is located below the acoustic probe (201); the shielding assembly includes a toothed ring (6), multiple rotating heads (7), multiple gears (8), multiple swing arms (9), and multiple flexible shielding strips (10); the toothed ring (6) is fixedly connected to the ultrasonic head (4); multiple Rotating heads (7) are arranged in a ring array around the periphery of the ultrasonic head (4) and are rotatably connected to the bottom end of the acoustic head (2); a gear (8) is fixedly installed on each rotating head (7), and the gear (8) meshes with the gear ring (6); a swing arm (9) is fixedly connected to each rotating head (7), and a flexible shielding strip (10) is connected between two adjacent swing arms (9); the flexible shielding strip (10) is provided with an acoustic isolation structure to block the acoustic probe (201) from the ultrasonic head (4). Signal crosstalk between acoustic probes (401); when the ultrasonic head (4) drives the gear ring (6) to rotate, the gear ring (6) drives each gear (8) and the rotating head (7) to rotate, and the rotating head (7) drives the swing arm (9) to swing, so that the flexible shielding strip (10) switches between the open state and the contracted state; when the flexible shielding strip (10) is in the open state, it forms an isolation barrier surrounding the acoustic probe (201) and the ultrasonic probe (401), realizing the acoustic signal isolation between the two probes.

2. The dual-mode cementing quality logging instrument according to claim 1, characterized in that, The surface of the flexible shielding strip (10) is covered with an acoustic isolation material layer, which includes at least one of a sound insulation material, a sound absorption material, or an acoustic impedance matching layer.

3. The dual-mode cementing quality logging instrument according to claim 2, characterized in that, When the flexible shielding strip (10) is opened, it forms a ring barrier, covering the outside of the ultrasonic head (4) and located between the acoustic probe (201) and the ultrasonic probe (401).

4. The dual-mode cementing quality logging instrument according to claim 3, characterized in that, The turntable (5) is arranged coaxially with the ultrasonic head (4), and the ultrasonic testing rod (3) rotates coaxially with the turntable (5) and the ultrasonic head (2).

5. The dual-mode cementing quality logging instrument according to claim 4, characterized in that, It also includes a limiting structure for limiting the rotation angle of the rotating head (7); the limiting structure includes multiple arc-shaped relief grooves (11) and multiple limiting shafts (12), the multiple arc-shaped relief grooves (11) correspond one-to-one with the multiple rotating heads (7) and are opened on the bottom surface of the ultrasonic head (4), the arc-shaped relief grooves (11) are arranged around the periphery of the rotating head (7); each rotating head (7) is fixedly connected to a limiting shaft (12) on its periphery, the limiting shaft (12) being away from the surrounding area. One end of the rotating head (7) is slidably embedded in the corresponding arc-shaped relief groove (11) and can slide along the extension direction of the arc-shaped relief groove (11) to limit the rotation stroke of the rotating head (7). When the ultrasonic head (4) rotates around the whole circle, it drives the turntable (5) to rotate synchronously. When the ultrasonic head (4) rotates in the forward or reverse direction to drive the flexible shielding strip (10) to open or close, the rotation stroke of the rotating head (7) is limited and does not hinder the full rotation of the ultrasonic head (4) and the detection of cement defects in the well wall by the ultrasonic probe (401).

6. The dual-mode cementing quality logging instrument according to claim 5, characterized in that, The center of the arc-shaped relief groove (11) coincides with the rotation axis of the corresponding rotating head (7), and the central angle of the arc-shaped relief groove (11) is 30°-60°.

7. The dual-mode cementing quality logging instrument according to claim 6, characterized in that, The end of the limiting shaft (12) away from the rotating head (7) is rotatably fitted with a wear-resistant sliding sleeve (13), and the wear-resistant sliding sleeve (13) slides and fits against the inner wall of the arc-shaped relief groove (11).

8. The dual-mode cementing quality logging instrument according to claim 7, characterized in that, The inner wall of the arc-shaped relief groove (11) is provided with a lubrication groove, which is filled with solid grease. The limiting shaft (12) is correspondingly arranged with the lubrication groove and is in contact with the solid grease.

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