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CN-122014125-A - Wellbore drill rod centralizer

CN122014125ACN 122014125 ACN122014125 ACN 122014125ACN-122014125-A

Abstract

The invention provides a well drill rod centralizer, wherein a plurality of axially extending sliding strip grooves are formed in the circumferential array of the outer wall of a pipe body, an operation sleeve is sleeved on the outer wall of the pipe body in a sliding manner, a plurality of convex body blocks which are in sliding connection with the sliding strip grooves are formed in the inner wall of the operation sleeve, the inner walls of the two axial ends of the sliding strip grooves are connected with the side walls of the two ends of the convex body blocks through springs, conical surface structures are adopted at the head end and the tail end of the operation sleeve, and a plurality of axially extending flow passages are formed in the outer wall of the operation sleeve. According to the well drill rod centralizer, the operation sleeve sleeved on the outer wall of the pipe body in a sliding manner and the spring for providing driving force are used, on the basis of spring energy storage through friction between the operation sleeve and the inner wall of a well bore, when an oncoming falling block is faced, the elastic potential energy stored by the spring is rapidly released through the inherent phenomenon that the falling block presses the side wall of the operation sleeve, the operation sleeve is driven to push the falling block to carry out the falling block crushing operation, the timely cleaning of the falling block is realized, the falling block crushing is carried out, and the problem that the centralizer is blocked by the falling block is avoided.

Inventors

  • WANG QING
  • HE LIU
  • WANG HAIGE
  • JI GUODONG
  • HUANG HONGCHUN
  • LIU XIAOAO
  • LIU LI
  • ZHANG JIAWEI
  • YU JINPING
  • CHEN CHANGCHANG

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团工程技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. A wellbore drill rod centralizer is used for being installed on a drill rod and being placed in a wellbore together, and comprises a pipe body (3), wherein male threaded connectors (1) and female threaded connectors (2) are respectively arranged at two ends of the pipe body (3), the wellbore drill rod centralizer is characterized in that a plurality of axially extending sliding strip grooves (4) are formed in the circumferential array of the outer wall of the pipe body (3), an operation sleeve (5) is sleeved on the outer wall of the pipe body (3) in a sliding mode, a plurality of convex body blocks (6) which are in sliding connection with the sliding strip grooves (4) are formed in the inner wall of the operation sleeve (5), two end inner walls of the sliding strip grooves (4) are connected with two end side walls of the convex body blocks (6) in the axial direction through springs (7), and a plurality of axially extending flow passages (8) are formed in the head end and the tail end of the operation sleeve (5) through conical surface structures.
  2. 2. The wellbore drilling rod centralizer according to claim 1, characterized in that the outer wall of the pipe body (3) is also provided with a plurality of axially extending limit grooves (9) in a circumferential array, and the inner wall of the operation sleeve (5) is provided with a plurality of limit blocks (10) which are in sliding connection with the limit grooves (9); the spacing between the end part of the limiting block (10) and the inner wall of the end part of the limiting strip groove (9) in the same direction is smaller than the spacing between the end part of the convex block (6) in the same direction and the inner wall of the end part of the sliding strip groove (4).
  3. 3. The wellbore drilling rod centralizer according to claim 2, characterized in that the outer wall of the pipe body (3) is provided with a ring sleeve part (11), the outer wall of the ring sleeve part (11) is provided with a sliding strip groove (4) and a limiting strip groove (9), and the thickness of the ring sleeve part (11) is larger than the depths of the sliding strip groove (4) and the limiting strip groove (9).
  4. 4. A wellbore drilling rod centralizer according to claim 3, characterized in that the outer wall of the pipe body (3) is sleeved with two limiting rings (12), the two limiting rings (12) are respectively positioned at two ends of the operation sleeve (5), and when the limiting block (10) moves to one end until the end part of the limiting block is abutted with the inner wall of the end part of the sliding strip groove (4) in the same direction, the operation sleeve (5) is abutted with the limiting rings (12) in the same direction.
  5. 5. The wellbore drilling rod centralizer according to claim 2, characterized in that the number of the runners (8) is 3-6, and the total number of the limiting blocks (10) and the convex body blocks (6) is 4-12.
  6. 6. The wellbore drilling rod centralizer according to claim 2, characterized in that the flow channel (8) adopts a spiral structure or a straight structure.
  7. 7. The wellbore drilling rod centralizer according to claim 2, characterized in that the outer wall of the pipe body (3) is sleeved with a ring body block (13), the ring body block (13) is located between the working sleeve (5) and the male threaded joint (1), and the ring body block (13) comprises a sleeve ring block (14) sleeved on the outer wall of the pipe body (3) and a cutting block (15) circumferentially arranged on the outer wall of the sleeve ring block (14).
  8. 8. The wellbore drilling rod centralizer according to claim 7, characterized in that the slitting block (15) comprises a cutting portion (1501) facing the side of the pin joint (1) and a guiding portion (1502) facing the working sleeve (5), the guiding portion (1502) having a conical surface structure facing the side wall of the pin joint (1), the cutting portion (1501) having a wedge structure.
  9. 9. The wellbore drill pipe centralizer of claim 8, wherein the side wall of the guide portion (1502) facing the pin (1) is of an external conical surface configuration with an included angle of 30-45 ° and the side wall of the cutting portion (1501) facing the inner wall of the wellbore is of an internal conical surface configuration with an included angle of 20-45 °.
  10. 10. A wellbore drill rod centralizer according to any of claims 1-9, characterized in that the surface of the working sleeve (5) is coated with a non-stick coating.

Description

Wellbore drill rod centralizer Technical Field The invention belongs to the technical field of deep well exploration equipment, and particularly relates to a well drill rod centralizer. Background The centralizer is an auxiliary tool arranged on a drilling tool in drilling operation, and mainly aims to keep a drilling rod centered and stabilize a drilling tool track so as to ensure the quality and drilling efficiency of a well bore. In the drilling operation process, especially facing the deep well section of the ultra-deep well of the level of ten thousand meters, the harsh environment of ultra-high temperature and ultra-high pressure and complicated ground stress coupling is needed to face, because the stability of the well wall is difficult to be well guaranteed, the instability of the well wall can lead to the falling block to fall down in a large volume and directly contact with the drill rod and the centralizer, the distance between the centralizer of the drill rod and the inner wall of the well shaft is smaller than the distance between the side wall of the drill rod and the inner wall of the well shaft, so that the effective overflow area of the annular space of the well shaft is greatly reduced, the risk of blocking the falling block at the centralizer is greatly increased, and the improvement of the drilling quality of the ultra-deep well of the level of ten thousand meters is directly influenced. In order to solve the problem of block dropping and blocking, a drill rod is usually moved by lifting and lowering a drilling tool, but a worker cannot timely acquire a shaft blocking or block dropping information by the method, so that when a ground worker finds the blocking, the worker is mostly behind the blocking accident. Thus, there is a need for a tool that can timely clear large drop block jams in the drill pipe centralizer position. Disclosure of Invention In view of the above problems, the present invention provides a wellbore drill pipe centralizer, including: the pipe body, the both ends of pipe body are equipped with pin joint and female screwed joint respectively, and its characterized in that, a plurality of axial extension's slip strip groove has been seted up to the outer wall circumference array of pipe body, and the operation cover is cup jointed in the pipe body outer wall slip, and a plurality of convex body pieces of sliding grafting with the slip strip groove are seted up to the inner wall of operation cover, all link up through the spring between the both ends inner wall of slip strip groove axial and the convex body piece both ends lateral wall, and a plurality of axial extension's runner has all been seted up to the outer wall of operation cover adopting conical surface structure and operation cover to the end-to-end. Furthermore, a plurality of limiting grooves extending axially are formed in the outer wall of the pipe body in a circumferential array manner, and a plurality of limiting blocks which are in sliding connection with the limiting grooves are formed in the inner wall of the operation sleeve; the spacing between the end part of the limiting block and the inner wall of the end part of the limiting strip groove in the same direction is smaller than the spacing between the end part of the convex body block in the same direction and the inner wall of the end part of the sliding strip groove. Furthermore, the outer wall of the pipe body is provided with a ring sleeve part, the outer wall of the ring sleeve part is provided with a sliding strip groove and a limiting strip groove, and the thickness of the ring sleeve part is larger than the depths of the sliding strip groove and the limiting strip groove. Furthermore, the outer wall of the pipe body is sleeved with two limiting rings, the two limiting rings are respectively positioned at two ends of the operation sleeve, and when the limiting block moves to one end to the end part to be abutted with the inner wall of the end part in the same direction as the sliding strip groove, the operation sleeve is abutted with the limiting rings in the same direction. Further, the number of the flow channels is 3-6, and the total number of the limiting blocks and the convex body blocks is 4-12. Further, the flow channel adopts a spiral structure or a linear structure. Still further, the body outer wall cup joints the ring body piece, and the ring body piece is located between operation cover and the male connector, the ring body piece is including cup jointing the collar piece at the body outer wall to and the branch cutting piece of circumference array arrangement at the collar piece outer wall. Still further, the cutting block includes a cutting portion facing the side of the pin joint and a guiding portion facing the side of the working sleeve, the guiding portion adopts a tapered surface structure facing the side wall of the pin joint, and the cutting portion adopts a wedge structure. Furthermore, the side wall of the guiding part