Centralizer of well cementation quality detector

Abstract

The invention discloses a centralizer of a well cementation quality detector, and relates to the technical field of exploratory well equipment, the centralizer comprises a main body sleeve, mounting clamping grooves are circumferentially formed in the two ends of the main body sleeve, a centralizing mechanism is arranged in the mounting clamping grooves, the centralizing mechanism comprises a fixed sleeve detachably sleeved with the mounting clamping grooves, and an adjusting assembly is arranged on the outer wall of the fixed sleeve. The adjusting assembly is provided with a plurality of sets of righting arms, and every two adjacent righting arms are arranged in a staggered mode. The main body sleeve is centralized through the multiple sets of centralizing arms of the centralizing mechanism, so that the main body sleeve is always located in the center of the shaft and kept stable, and the unfolding lengths of the multiple sets of centralizing arms are adjusted through the adjusting assembly, so that the multiple sets of centralizing arms are always attached to the wall of the shaft; and then the arranged scraping assembly is used for scraping obstacles on the shaft wall, so that the obstacles on the shaft wall cannot affect sliding of the righting mechanism in the descending process of the main body sleeve, and blockage, vibration and deviation of the main body sleeve caused by the obstacles are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of well exploration equipment, in particular to a centralizer of a cementing quality detector. Background Art

[0002] Cementing quality testing requires evaluating the cement sheath bonding state through sonic and ultrasonic technologies. The detection accuracy directly depends on whether the centralizer can maintain a stable posture of the detector at the center of the wellbore (radial offset must be ≤2mm) and ensure that there are no obstacles in the detection path.

[0003] The existing centralizer has a single adjustment method and only uses a single spring or fixed structure. It has poor adaptability to wellbores of different diameters, and the fit with the wellbore wall is not good, which makes it easy to deviate, affecting the accuracy of centralization. In addition, the existing centralizer is not convenient for scraping off the bumps on the inner wall of the wellbore. During the descent of the cementing quality tester, it is easy to cause the cementing quality tester to get stuck or produce large vibrations, resulting in large errors in the data detected by the cementing quality tester.

[0004] In view of this, the present invention is proposed to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to provide a centralizer for a cementing quality detector to solve the technical problems in the prior art that the centralizer has a single adjustment method and is inconvenient to scrape off bumps on the inner wall of the wellbore.

[0006] The object of the present invention is to provide a centralizer for a cementing quality detector, comprising a main sleeve, with mounting slots circumferentially provided at both ends of the main sleeve, characterized in that a centralizing mechanism is provided in the mounting slots; The righting mechanism includes a fixed sleeve that is detachably mounted in the mounting slot, an adjustment assembly being provided on the outer wall of the fixed sleeve, and a plurality of righting arms being provided on the adjustment assembly. The plurality of righting arms are evenly arranged along the circumference of the fixed sleeve, and adjacent righting arms are staggered. The scraping assembly is arranged at the lower end of the main sleeve and below the straightening mechanism.

[0007] Furthermore, the adjustment assembly includes a symmetrically arranged adjustment clamp ring, which can be slidably mounted on the end of the main sleeve, and the inner side wall of the adjustment clamp ring is evenly provided with a plurality of limit parts; The outer wall of the fixed sleeve is provided with a plurality of mounting grooves along its height direction, and the plurality of limiting parts are slidably disposed in the plurality of mounting grooves respectively; A rotatable driving rod is provided in the mounting groove along its height direction, and a plurality of limiting parts are respectively sleeved on the plurality of driving rods, wherein any one driving rod is a screw rod, and the other driving rods are rotating rods, the screw rod is threadedly connected to the corresponding limiting part, and the rotating rod is slidably connected to the corresponding limiting part; One end of the screw rod away from the scraping assembly passes through the fixed sleeve, and the first drive motor is provided on the end of the fixed sleeve away from the scraping assembly. The first drive motor drives the screw rod to rotate.

[0008] Furthermore, the righting arm includes a long arm and a short arm in the same vertical direction; The ends of the long arm and the short arm are respectively hinged to the peripheral walls of the two adjusting clamps; One end of the short arm facing away from the adjusting clamp is hinged to the long arm; A guide wheel is provided at one end of the long arm away from the adjusting clamping ring.

[0009] Furthermore, the short arm is a telescopic arm, and a spring is provided on the telescopic arm.

[0010] Furthermore, the scraping assembly includes a driving part, which includes a large gear sleeved on the end of the main sleeve; a meshing driving gear is provided on one side of the large gear; Wherein, any rotating rod passes through the fixed sleeve, and the driving gear is sleeved on the rotating rod, and the rotating rod at the center of the driving gear is driven by the second motor.

[0011] Furthermore, the scraping assembly further includes a scraping portion, which includes a cutter disc sleeved on the end of the main sleeve, and the bottom of the cutter disc is fixedly connected to the upper end surface of the large gear; The outer wall of the cutter disc is provided with a plurality of mounting holes along its circumferential direction, and a slidable cutter head is provided in the mounting holes; An electric push rod is provided in the mounting hole, and the output end of the electric push rod is connected to the cutter head to drive the cutter head to extend and retract.

[0012] Furthermore, a plurality of threaded holes are provided in the mounting slot along its circumferential direction; The fixed sleeve comprises a left half sleeve and a right half sleeve, and arc-shaped convex strips are arranged on the inner sides of the left half sleeve and the right half sleeve; The left half sleeve and the right half sleeve are assembled to form a fixed sleeve. At this time, the two arc-shaped ridges form an annular ridge and are located in the mounting groove. The left half sleeve and the right half sleeve are fixed in the installation slot by the cooperation of bolts and threaded holes.

[0013] Furthermore, bellows are provided between the two adjusting clamps and on the outsides of the two adjusting clamps.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects: First, the main sleeve is straightened by the multiple sets of straightening arms of the straightening mechanism, so that the main sleeve is always in the center of the wellbore and remains stable, and the expansion lengths of the multiple sets of straightening arms are adjusted by the adjustment components, so that the multiple sets of straightening arms are always in contact with the wellbore wall to prevent the main sleeve from shifting. Then, the obstacles on the wellbore wall are scraped away by the scraping components, so that the obstacles on the wellbore wall will not affect the sliding of the straightening mechanism during the descent of the main sleeve, thereby preventing the obstacles from causing the main sleeve to get stuck, vibrate and shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings: Figure 1 A schematic structural diagram of a centralizer of a cementing quality tester provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the centralizer of the cementing quality tester provided in an embodiment of the present application after removing the upper end of the centralizing mechanism; Figure 3 A schematic structural diagram of a centralizer mechanism and a scraper assembly of a cementing quality tester provided in an embodiment of the present application; Figure 4 A schematic structural diagram of a centralizer mechanism of a cementing quality tester provided in an embodiment of the present application; Figure 5 for Figure 3 A schematic structural diagram of the cementing quality tester provided, showing the centralizer from another perspective after the bellows are removed.

[0016] Figure numerals: 1. Main sleeve; 2. Straightening mechanism; 3. Bellows; 4. Scraping assembly; 5. Mounting slot; 21. Fixed sleeve; 22. Adjusting snap ring; 23. Long arm; 24. Short arm; 25. Spring; 26. Guide wheel; 27. Drive rod; 28. Drive gear; 41. Cutting disc; 42. Large gear; 43. Cutting head.

[0017] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

[0019] See also Figures 1 to 5 As shown, an embodiment of the present application provides a centralizer for a cementing quality detector, comprising a main sleeve 1, with mounting slots 5 circumferentially provided at both ends of the main sleeve 1, characterized in that a centralizer mechanism 2 is arranged in the mounting slot 5, the centralizer mechanism 2 comprises a fixed sleeve 21 detachably sleeved in the mounting slot 5, an adjusting assembly is provided on the outer wall of the fixed sleeve 21, a plurality of groups of centralizer arms are provided on the adjusting assembly, and there are 6 groups of centralizer arms, and the plurality of groups of centralizer arms are evenly arranged along the circumferential direction of the fixed sleeve 21, and two adjacent centralizer arms are staggered, a scraping assembly 4, and the scraping assembly 4 is arranged at the lower end of the main sleeve 1 and below the centralizer mechanism 2.

[0020] In the above scheme, during the process of the main sleeve 1 being lowered into the well, the main sleeve 1 is first straightened by the multiple sets of straightening arms of the straightening mechanism 2, so that the main sleeve 1 is always in the center of the wellbore and remains stable, and the expansion lengths of the multiple sets of straightening arms are adjusted by the provided adjustment components, so that the multiple sets of straightening arms are always in contact with the wellbore wall to prevent the main sleeve 1 from being offset, and then the obstacles on the wellbore wall are scraped away by the provided scraping component 4, so that the obstacles on the wellbore wall will not affect the sliding of the straightening mechanism 2 during the descent of the main sleeve 1, thereby preventing the obstacles from causing the main sleeve 1 to be stuck, vibrate and offset.

[0021] In some possible implementations, see Figures 3 to 5 As shown, the adjustment assembly includes a symmetrically arranged adjustment snap ring 22, which can be slidably mounted on the end of the main sleeve 1, and a plurality of limit parts are evenly arranged on the inner side wall of the adjustment snap ring 22. The outer wall of the fixed sleeve 21 is provided with a plurality of mounting grooves along its height direction, and the plurality of limit parts can be slidably arranged in the plurality of mounting grooves respectively. The mounting groove limits the adjustment snap ring 22 through the limit parts, and a rotatable driving rod 27 is provided in the mounting groove along its height direction. The plurality of limit parts are respectively mounted on the plurality of driving rods 27, wherein any one driving rod 27 is a screw rod, and the remaining driving rods 27 are rotating rods. The screw rod is threadedly connected to the corresponding limit part, and the rotating rod is slidably connected to the corresponding limit part. The end of the screw rod away from the scraping assembly 4 passes through the fixed sleeve 21, and the end of the fixed sleeve 21 away from the scraping assembly 4 is provided with a first driving motor, and the first driving motor drives the screw rod to rotate.

[0022] In the above scheme, when adjusting the expansion length of multiple groups of righting arms, the first drive motor is controlled to start, and the first drive motor starts to drive the screw to rotate through its output shaft. The rotation of the screw drives the two adjusting clamps 22 to move relative to or towards each other. The two adjusting clamps 22 move relative to or towards each other and drive the multiple groups of righting arms to expand or contract, so that the ends of the multiple groups of righting arms fit against the wellbore wall, so that the main sleeve 1 is always in the center of the wellbore and remains stable.

[0023] In some possible implementations, see Figures 3 to 5 As shown, the straightening arm includes a long arm 23 and a short arm 24 in the same vertical direction. The ends of the long arm 23 and the short arm 24 are respectively hinged to the peripheral walls of the two adjusting clamps 22. The end of the short arm 24 away from the adjusting clamp 22 is hinged to the long arm 23. The end of the long arm 23 away from the adjusting clamp 22 is provided with a guide wheel 26. The guide wheel 26 replaces the traditional sliding contact, so that the friction between the long arm 23 and the wellbore wall is reduced, thereby avoiding deformation of the straightening arm due to excessive friction.

[0024] In the above scheme, the two adjustment rings 22 move relative to or toward each other, respectively driving the long arm 23 and the short arm 24 to rotate around the hinge point, so that the short arm 24 supports or retracts the long arm 23, completing the adjustment of the extension length of the straightening arm. When the long arm 23 is retracted to the extreme position, it will not cause movement interference with the scraping assembly 4.

[0025] In some possible implementations, see Figures 3 to 5 As shown, the short arm 24 is a telescopic arm, and a spring 25 is provided on the telescopic arm. The spring 25 is a hard spring with a preload force of 500N. When there is a small unscraped raised obstacle on the wellbore wall, the downward movement will squeeze the short arm 24 through the long arm 23, thereby squeezing the spring 25, and the guide wheel 26 can move normally to prevent the stabilizer from getting stuck.

[0026] In some possible implementations, see Figure 5 As shown, the scraping assembly 4 includes a driving unit, which includes a large gear 42 mounted on the end of the main sleeve 1; a meshing driving gear 28 is provided on one side of the large gear 42, wherein any rotating rod passes through the fixed sleeve 21, and the driving gear 28 is mounted on the rotating rod, and the rotating rod at the center of the driving gear 28 is driven by a second motor. The scraping assembly 4 also includes a scraping part, which includes a blade disc 41 mounted on the end of the main sleeve 1, the bottom of the blade disc 41 is fixedly connected to the upper end face of the large gear 42, and the outer peripheral wall of the blade disc 41 is provided with multiple mounting holes along its circumferential direction, and a slidable cutter head 43 is provided in the mounting hole, and an electric push rod is provided in the mounting hole, and the output end of the electric push rod is connected to the cutter head 43 to drive the cutter head 43 to extend and retract.

[0027] In the above scheme, when driving the scraping part, the second motor is controlled to start, and the second motor starts to drive any rotating rod to rotate through its output end. The rotation of the rotating rod drives the driving gear 28 to rotate, and the rotation of the driving gear 28 drives the large gear 42 to rotate. The rotation of the large gear 42 drives the cutter disc 41 to rotate, thereby driving the cutter head 43 to scrape the obstacles on the wellbore wall; when the extension length of the cutter head 43 needs to be adjusted according to the size of the wellbore, multiple electric push rods are controlled to start synchronously, thereby adjusting the extension length of the cutter head 43 synchronously, so that the cutter head 43 can adapt to wellbores of different sizes.

[0028] In some possible implementation schemes, a plurality of threaded holes are provided in the mounting slot 5 along its circumferential direction, and the fixed sleeve 21 includes a left half sleeve and a right half sleeve (not shown in the figure), and arc-shaped convex strips are provided on the inner sides of the left half sleeve and the right half sleeve. The left half sleeve and the right half sleeve are assembled to form the fixed sleeve 21. At this time, the two arc-shaped convex strips form an annular convex strip and are located in the mounting slot 5. The left half sleeve and the right half sleeve are fixed in the mounting slot 5 by the cooperation of bolts and threaded holes.

[0029] In the above scheme, when installing the fixed sleeve 21, the left half sleeve and the right half sleeve are buckled on the end of the main sleeve 1, and the two arc-shaped convex strips are located in the installation groove 5. The annular convex strips formed in the two installation grooves 5 are limited in the installation groove 5, and the left half sleeve and the right half sleeve are fixed in the installation groove 5 by bolts, which facilitates the disassembly and installation of the fixed sleeve 21.

[0030] In some possible implementations, see Figures 1 to 3 As shown, a bellows 3 is provided between the two adjusting clamping rings 22 and outside the two adjusting clamping rings 22 .

[0031] In the above solution, the bellows 3 can be provided to prevent scraped obstacle residues from entering the straightening mechanism 2 and causing blockage inside the straightening mechanism 2, thereby preventing the obstacle residues from damaging the straightening mechanism 2.

[0032] This specific embodiment is merely an explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of protection of the invention, they are protected by patent law.

Claims

1. A centralizer for a cementing quality detector, comprising a main sleeve (1), wherein both ends of the main sleeve (1) are provided with mounting slots (5) in a circumferential direction, characterized in that: A straightening mechanism (2) is provided in the installation slot (5); The righting mechanism (2) comprises a fixed sleeve (21) detachably sleeved in the mounting slot (5), an adjustment assembly being provided on the outer wall of the fixed sleeve (21), and a plurality of righting arms being provided on the adjustment assembly, the plurality of righting arms being evenly arranged along the circumferential direction of the fixed sleeve (21), and two adjacent righting arms being staggered. A scraping assembly (4) is provided at the lower end of the main body sleeve (1) and is located below the straightening mechanism (2).

2. The centralizer of the cementing quality tester according to claim 1, characterized in that: The adjustment assembly comprises a symmetrically arranged adjustment ring (22), the adjustment ring (22) being slidably mounted on the end of the main sleeve (1), and a plurality of limiting portions being evenly arranged on the inner side wall of the adjustment ring (22); The outer wall of the fixed sleeve (21) is provided with a plurality of mounting grooves along its height direction, and the plurality of limiting portions are slidably arranged in the plurality of mounting grooves respectively; A rotatable driving rod (27) is provided in the installation groove along its height direction, and a plurality of the limiting portions are respectively sleeved on the plurality of driving rods (27), wherein any one of the driving rods (27) is a screw rod, and the other driving rods (27) are rotating rods, the screw rod is threadedly connected to the corresponding limiting portion, and the rotating rod is slidably connected to the corresponding limiting portion; One end of the screw rod facing away from the scraping assembly (4) passes through the fixed sleeve (21), and one end of the fixed sleeve (21) facing away from the scraping assembly (4) is provided with a first drive motor, and the first drive motor drives the screw rod to rotate.

3. The centralizer of the cementing quality tester according to claim 2, characterized in that: The righting arm comprises a long arm (23) and a short arm (24) in the same vertical direction; The ends of the long arm (23) and the short arm (24) are respectively hinged to the peripheral walls of the two adjusting clamps (22); One end of the short arm (24) facing away from the adjusting clamp (22) is hinged to the long arm (23); A guide wheel (26) is provided at one end of the long arm (23) facing away from the adjusting clamping ring (22).

4. The centralizer of the cementing quality tester according to claim 3, characterized in that: The short arm (24) is a telescopic arm, and a spring (25) is provided on the telescopic arm.

5. The centralizer of the cementing quality tester according to claim 1, characterized in that: The scraping assembly (4) includes a driving portion, and the driving portion includes a large gear (42) sleeved on the end of the main sleeve (1); a meshing driving gear (28) is provided on one side of the large gear (42); Wherein, any of the rotating rods passes through the fixed sleeve (21), and the driving gear (28) is sleeved on the rotating rod, and the rotating rod at the center of the driving gear (28) is driven by a second motor.

6. The centralizer of the cementing quality tester according to claim 5, characterized in that: The scraping assembly (4) further includes a scraping portion, the scraping portion including a cutter disc (41) sleeved on the end of the main sleeve (1), the bottom of the cutter disc (41) being fixedly connected to the upper end surface of the large gear (42); The outer peripheral wall of the cutter disc (41) is provided with a plurality of mounting holes along its circumferential direction, and a slidable cutter head (43) is provided in the mounting hole; An electric push rod is provided in the mounting hole, and an output end of the electric push rod is connected to the cutter head (43) to drive the cutter head (43) to extend and retract.

7. The centralizer of the cementing quality tester according to any one of claims 1 to 6, characterized in that: A plurality of threaded holes are provided in the mounting slot (5) along its circumferential direction; The fixed sleeve (21) comprises a left half sleeve and a right half sleeve, and the inner sides of the left half sleeve and the right half sleeve are both provided with arc-shaped convex strips; The left half sleeve and the right half sleeve are assembled to form the fixed sleeve (21), at which point the two arc-shaped ridges form an annular ridge and are located in the mounting slot (5); The left half sleeve and the right half sleeve are fixed in the mounting slot (5) through the cooperation of bolts and threaded holes.

8. The centralizer of the cementing quality tester according to claim 3, characterized in that: A bellows (3) is provided between the two adjusting clamping rings (22) and outside the two adjusting clamping rings (22).

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