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CN-121976759-A - Casing centralizer and method for well cementation construction

CN121976759ACN 121976759 ACN121976759 ACN 121976759ACN-121976759-A

Abstract

The invention relates to a casing centralizer and a casing centralizer method for well cementation construction, and relates to the technical field of casing centralizers. The hydraulic jack comprises a fastening ring, wherein a holding component is arranged at the bottom of the rotating ring, a plurality of interference plates are fixed in the holding component at equal angles, a plurality of centering blocks are arranged at outer equal angles of the fastening ring, the centering blocks are arranged at two ends of the centering blocks, the rotating component is arranged at the bottom end of the fixing plate, and the hydraulic jack can adaptively float along with irregular change of the inner diameter of a well wall through the centering blocks.

Inventors

  • SUN JIANRU
  • BAI XUEJIA
  • SHAO YINGYING

Assignees

  • 菲哲石油装备(辽宁)有限公司

Dates

Publication Date
20260505
Application Date
20260330

Claims (10)

  1. 1. The casing centralizer for well cementation construction comprises a fastening ring (1) and is characterized in that a rotating ring (2) is arranged in the fastening ring (1), a holding assembly is arranged at the bottom of the rotating ring (2), a plurality of abutting plates (4) are fixed in the holding assembly at equal angles, the abutting plates (4) are driven by the holding assembly to centripetally move so as to prevent the casing from shaking, a plurality of centralizing blocks (5) are arranged at equal angles outside the fastening ring (1), centralizing assemblies are arranged at two ends of each centralizing block (5), the centralizing blocks (5) are stably moved through the centralizing assemblies, a fixing plate (7) is fixed on one side of each centralizing block (5), a rotating assembly is arranged at the bottom end of each fixing plate (7), a gear ring (9) is meshed on one side of each rotating assembly, and the gear ring (9) is driven to rotate through the rotating assembly, and the inner wall of each gear ring (9) is fixedly connected with the rotating ring (2).
  2. 2. The casing centralizer for well cementation construction of claim 1, wherein the enclasping assembly comprises a rotating plate (301) rotationally connected with a rotating ring (2), the rotating plate (301) is rotationally connected with a sliding block (302) through a connecting shaft, and the sliding block (302) is in limiting sliding connection with a sliding rail (303).
  3. 3. The casing centralizer for well cementation construction according to claim 2, wherein the rotating plate (301) is rotatably connected with the rotating ring (2) through a connecting shaft, and the sliding rail (303) is arranged at the bottom of the rotating plate (301).
  4. 4. The casing centralizer for well cementation construction according to claim 2, wherein one side of the sliding block (302) is fixedly connected with the abutting plate (4), the abutting plate (4) is slidably connected with the sliding rail (303), and the sliding rail (303) is provided with a limiting groove (304) which is matched with the sliding block (302) and the abutting plate (4) to move.
  5. 5. The casing centralizer for well cementation construction according to claim 1, wherein the enclasping assembly comprises a push plate (602) rotationally connected with a centralizing block (5) through a connecting shaft, a roller (601) is rotationally connected to one side of the centralizing block (5), a moving block (603) is rotationally connected to the push plate (602) through the connecting shaft, a connecting ring (604) is fixed between every two moving blocks (603), and a spring (605) is arranged between the moving block (603) and the fastening ring (1).
  6. 6. The casing centralizer for well cementation construction of claim 5, wherein one end of the spring (605) is fixedly connected with the moving block (603), and the other end of the spring (605) is fixedly connected with the protruding position of the fastening ring (1).
  7. 7. The casing centralizer for well cementation construction of claim 5, wherein the fastening ring (1) is provided with a cavity matched with the moving block (603) to move, and the moving block (603) is in limit sliding connection with the fastening ring (1).
  8. 8. The casing centralizer for well cementation construction according to claim 1, wherein the rotating assembly comprises a threaded rod (801) fixed at the bottom end of the fixed plate (7), a connecting column (802) is rotatably connected to the outer wall of the threaded rod (801) through threads, the connecting column (802) is rotatably connected with the protruding position of the inner wall of the fastening ring (1), and a gear (803) is fixed at the bottom end of the connecting column (802).
  9. 9. The casing centralizer for well cementation according to claim 8, wherein the gear (803) is meshed with the gear ring (9), and the connecting column (802) is provided with a thread groove which is matched with the threaded rod (801) to move.
  10. 10. A method of using a casing centralizer for well cementation, suitable for use in any one of claims 1-9, the method comprising the steps of: S1, inserting a sleeve into a fastening ring (1), primarily attaching a contact plate (4) to the sleeve, enabling a centralizing block (5) to be contacted with a well wall through a roller (601) during descending, changing sliding into rolling, reducing friction and abrasion, and improving descending safety; S2, extruding the well wall to enable the centralizing block (5) to drive the pushing plate (602) and the moving block (603) to slide, enabling the connecting ring (604) to realize synchronous action of the plurality of moving blocks (603), enabling the spring (605) to store energy for resetting, enabling the sleeve to be centered, and guaranteeing uniformity of the cement ring; S3, the moving block (603) drives the rotating ring (2) to rotate through the fixed plate (7), the threaded rod (801), the gear (803) and the gear ring (9), and drives the rotating plate (301) and the sliding block (302) to enable the abutting plate (4) to synchronously clamp the sleeve, so that the sleeve is prevented from loosening and moving.

Description

Casing centralizer and method for well cementation construction Technical Field The invention relates to the technical field of casing centralizers, in particular to a casing centralizer and a casing centralizer method for well cementation construction. Background In the well cementation construction process of the oil gas well, the casing centralizer is a core downhole tool for guaranteeing the well cementation quality, and has the core effects of centering and fixing the casing on the axis of the well bore, forming a uniform annular gap between the casing and the well wall, ensuring that cement paste can smoothly fill and uniformly replace drilling fluid in an annular hole, finally forming a continuous, complete and compact cement ring, realizing effective packing of an oil gas water layer and guaranteeing long-term stable production of the oil gas well. However, in the processes of casing running, circulating drilling fluid and cementing, the existing casing centralizer can lead the centralizer to slide up and down, so that the designed centering position is offset, the well cementation quality is influenced, the centralizer can freely rotate around the casing, the angles of the supporting wings and the elastic arms can be changed randomly, the well wall cannot be stably supported, even single-side stress and partial drilling sticking occur, in the processes of casing running and well cementation, the factors such as irregular well bore morphology, uneven stratum hardness and uneven well wall are extremely easy to lead the centralizer to be stressed and contracted by only one side, and because only one side provides elastic support, the stress direction and the reaction force direction are not in the same straight line, eccentric moment can be generated, the whole centralizer is inclined, deflected and laterally deflected, the casing cannot be stably restrained at the center position of the well bore, after the single-side compression deformation, the casing can be deflected towards the unsupported side or the weak support side, the annular space between the casing and the well wall is seriously uneven, the gap on one side is too small, the gap on one side is too large, the flowing is uneven, the groove is easy to form, the effect of channeling and the cement paste is easy to occur, and the well cementation quality is poor. Aiming at the problems, innovative design is urgently needed on the basis of the original casing centralizer and method for well cementation construction. Disclosure of Invention The technical scheme of the invention aims at solving the technical problem that the prior art is too single, provides a solution which is obviously different from the prior art, and particularly aims to provide a casing centralizer and a casing centralizer method for well cementation construction, so as to solve the problems provided by the prior art. The sleeve centralizer for well cementation construction and the method for achieving the purpose are characterized in that the sleeve centralizer for well cementation construction comprises a fastening ring, a rotating ring is arranged in the fastening ring, a holding assembly is arranged at the bottom of the rotating ring, a plurality of interference plates are fixed in the holding assembly at equal angles, the interference plates are driven to move centripetally through the holding assembly to prevent the sleeve from shaking, a plurality of centralizing blocks are arranged at equal angles outside the fastening ring, centralizing assemblies are arranged at two ends of each centralizing block, the centralizing blocks are stabilized to move through the centralizing assemblies, one side of each centralizing block is fixedly provided with a fixing plate, the bottom end of each fixing plate is provided with a rotating assembly, one side of each rotating assembly is meshed with a gear ring, the gear ring is driven to rotate through the rotating assembly, and the inner wall of each gear ring is fixedly connected with the rotating ring. Preferably, the enclasping assembly comprises a rotating plate rotationally connected with the rotating ring, wherein the rotating plate is rotationally connected with a sliding block through a connecting shaft, and the sliding block is in limiting sliding connection with a sliding rail. Preferably, the rotating plate is rotationally connected with the rotating ring through a connecting shaft, and the sliding rail is arranged at the bottom of the rotating plate. Preferably, one side of the sliding block is fixedly connected with the abutting plate, the abutting plate is in sliding connection with the sliding rail, and the sliding rail is provided with a limit groove for matching the sliding block and the abutting plate to move. Preferably, the enclasping assembly comprises a push plate rotationally connected with the righting block through a connecting shaft, one side of the righting block is rotationally connected with a roller, the