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CN-122014136-A - Spring piece prying type side pushing mechanism for cement sheath breaker

CN122014136ACN 122014136 ACN122014136 ACN 122014136ACN-122014136-A

Abstract

The invention is suitable for the field of casing side drilling operation, and provides a spring plate prying type side pushing mechanism for a cement sheath breaker, which comprises a first fixed rod, a second fixed rod, a plug rod, a spring plate and a movable roller shell, wherein the spring plate is bent to lift the movable roller shell to do side movement, the casing is applied with extrusion force to induce the cement sheath to crack, the spring plate prying type side pushing mechanism is adopted, the mechanism structure is greatly simplified, the overall outer diameter is reduced, the miniaturization and compactness of the mechanism are realized, the feeding requirements of small well diameter, thin-wall sleeve and complex well conditions are met, meanwhile, lateral extrusion is realized through elastic deformation of the elastic sheet, the stability of extrusion force is ensured, and the defects of complex and large size of the existing piston driving structure are overcome.

Inventors

  • HE XIA
  • ZENG XINLIN
  • ZHONG LIN
  • WANG GUORONG
  • CHEN LEI
  • ZHANG YUZHE
  • CAI ZHONGWEN
  • HE MIAO

Assignees

  • 西南石油大学

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. A shell fragment sled formula side push mechanism for cement sheath breaker, its characterized in that includes: The first fixing rod (1) and the second fixing rod (2) are concentrically and coaxially arranged; The inserting rod (3), the inserting rod (3) is fixed at one end of the first fixing rod (1), one end of the second fixing rod (2) is provided with an inserting hole (4) which is in inserting fit with the inserting rod (3) and is used for coaxially guiding and relatively sliding the first fixing rod (1) and the second fixing rod (2); the elastic piece (5) is arranged between the first fixed rod (1) and the second fixed rod (2), two ends of the elastic piece (5) are respectively connected with the first fixed rod (1) and the second fixed rod (2) in a rotating way, and the elastic piece can be bent and protruded under the driving of the relative movement of the first fixed rod (1) and the second fixed rod (2); The movable roller shell (6) is sleeved outside the elastic sheet (5), the first fixed rod (1) and the second fixed rod (2) in a columnar structure, a rectangular hole (7) is formed in the movable roller shell, and the rectangular hole (7) provides a bending and jacking movable space for the elastic sheet (5); The elastic sheet (5) can be bent to lift the movable roller shell (6) to do lateral movement, and extrusion force is applied to the sleeve to induce cracking of the cement sheath.
  2. 2. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 1, wherein the end part of the first fixing rod (1) far away from the inserted rod (3) is fixedly provided with a pressurizing roller (8).
  3. 3. Spring plate prying type side pushing mechanism for cement sheath breaker according to claim 1, characterized in that the movable roller shell (6) is in a conical structure along the center to two ends, and the conical inclination angle is 3 degrees to 5 degrees.
  4. 4. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 1, wherein the spring plate (5) is made of spring steel, and the middle part of the spring plate (5) protrudes in a direction away from the first fixing rod (1) and the second fixing rod (2).
  5. 5. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 1, wherein one end of the second fixing rod (2) far away from the jack (4) is provided with a limiting assembly for fixing the mechanism at a designated position of a shaft, and the limiting assembly comprises a fixing cylinder (9), a pair of limiting plates (10) and a driving unit; The fixed cylinder (9) is fixedly arranged at the end part of the second fixed rod (2), the pair of limiting plates (10) are movably embedded in the side wall of the fixed cylinder (9) and are symmetrically arranged along the diameter direction, and the driving unit is used for driving the two limiting plates (10) to do relative outward expansion or inward contraction movement.
  6. 6. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 5, wherein the driving unit comprises a movable rod (11), a chassis (12), a plurality of electric push rods (13) and a frustum-shaped driving block (14); The movable rod (11) is movably inserted into the end part of the fixed cylinder (9), the chassis (12) is fixed at the end part of the movable rod (11) positioned outside the fixed cylinder (9), and the plurality of electric push rods (13) are arranged between the chassis (12) and the end part of the fixed cylinder (9) in an array manner and used for driving the movable rod (11) to axially move; The driving block (14) is fixed on a rod body of the movable rod (11) positioned in the fixed cylinder (9), driving grooves (15) with the same taper as the driving block (14) are formed in the side surfaces, close to the driving block (14), of the two limiting plates (10), and the driving block (14) is slidably embedded between the two driving grooves (15) to drive the limiting plates (10) to radially expand through axial movement.
  7. 7. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 6, wherein a positioning cylinder (16) is fixedly arranged in the fixed cylinder (9), the end part of the movable rod (11) far away from the chassis (12) is movably inserted into the positioning cylinder (16), and a first spring (17) is arranged between the end part of the movable rod (11) and the inner wall of the positioning cylinder (16).
  8. 8. The spring plate prying type side pushing mechanism for the cement sheath breaker according to claim 5, wherein the limiting plate (10) is provided with a groove (18) on the side surface far away from the fixed cylinder (9), an abutting plate (19) is movably arranged in the groove (18) through an elastic unit, and an arched rubber pad (20) is arranged on the side surface far away from the elastic unit, of the abutting plate (19).
  9. 9. The spring plate prying side pushing mechanism for a cement sheath breaker according to claim 8, wherein the elastic unit includes a plurality of positioning bosses (21) and a second spring (23); The positioning bulges (21) are fixed on the side face of the abutting plate (19) facing the groove (18) at equal intervals, a positioning groove (22) which is in plug-in fit with the positioning bulges (21) is formed in the inner wall of the groove (18), and the second springs (23) are arranged in the positioning groove (22) and are abutted to the end parts of the positioning bulges (21).
  10. 10. Spring plate prying side pushing mechanism for a cement sheath breaker according to claim 1, characterized in that the width of the rectangular hole (7) is larger than the maximum bending protrusion height of the spring plate (5).

Description

Spring piece prying type side pushing mechanism for cement sheath breaker Technical Field The invention relates to the field of casing side drilling operation, in particular to a spring plate prying type side pushing mechanism for a cement ring breaker. Background At present, cement sheath crushers are widely applied to shaft disposal, well repair and packing operations and are used for applying local extrusion force to cement sheath on the outer side of a casing so as to induce cement sheath cracking, thereby weakening the overall integrity of the cement sheath. The cement sheath breaker is generally required to have the characteristics of compact structure and small outer diameter size due to the influence of conditions such as limited downhole diameter size, casing inner diameter, tool running space and the like. Because the cement sheath breaker in the prior art adopts the piston to drive the radial expansion, the structure generally needs to be provided with an independent driving cavity, a sealing component and a guiding structure, so that the whole size of the tool is larger, the structure is complex, and the cement sheath breaker is not beneficial to being used under the conditions of small well diameter, thin-wall sleeve or complex well conditions. Meanwhile, the size increase also increases the processing difficulty and the assembly complexity, and reduces the reliability and the adaptability of the tool. Therefore, there is still a need for a way to achieve miniaturization and compactness of the construction of cement sheath crushers while ensuring lateral extrusion capability. Disclosure of Invention The invention aims to provide a spring plate prying type side pushing mechanism for a cement sheath breaker, which is used for solving the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: A spring plate prying type side pushing mechanism for a cement ring crusher comprises a first fixing rod and a second fixing rod, wherein the first fixing rod and the second fixing rod are coaxially arranged in a concentric mode, an inserting rod is fixed at one end of the first fixing rod, an inserting hole which is matched with the inserting rod in an inserting mode is formed in one end of the second fixing rod and used for coaxially guiding and relatively sliding the first fixing rod and the second fixing rod, a spring plate is arranged between the first fixing rod and the second fixing rod, two ends of the spring plate are respectively connected with the first fixing rod and the second fixing rod in a rotating mode, bending protrusions can be driven by relative movement of the first fixing rod and the second fixing rod, a movable roller shell is sleeved outside the spring plate, the first fixing rod and the second fixing rod in a columnar mode, rectangular holes are formed in the inner portion of the movable roller shell, the rectangular holes provide a bending jacking movable space for the spring plate, the spring plate can jack the movable roller shell to move in a lateral mode, and extrusion force is applied to a sleeve to enable a cement ring to be cracked. As a further scheme of the invention, the end part of the first fixing rod, which is far away from the inserted link, is fixedly provided with a pressing roller. As a further scheme of the invention, the movable roller shell is in a conical structure along the center towards two ends, and the conical inclination angle is 3-5 degrees. As a further scheme of the invention, the elastic sheet is made of spring steel, and the middle part of the elastic sheet is protruded in the direction away from the first fixing rod and the second fixing rod. The fixed cylinder is fixedly arranged at the end part of the second fixed rod, the pair of limiting plates are movably embedded in the side wall of the fixed cylinder and are symmetrically arranged along the diameter direction, and the driving unit is used for driving the two limiting plates to do relative outward expansion or inward contraction movement. The driving unit comprises a movable rod, a chassis, a plurality of electric push rods and a frustum-shaped driving block, wherein the movable rod is movably inserted into the end part of the fixed cylinder, the chassis is fixed at the end part of the movable rod, which is positioned outside the fixed cylinder, the plurality of electric push rod arrays are arranged between the chassis and the end part of the fixed cylinder and are used for driving the movable rod to axially move, the driving block is fixed on a rod body of the movable rod, which is positioned in the fixed cylinder, two limiting plates are provided with driving grooves with the same taper as the driving blocks, and the driving blocks are slidably embedded between the two driving grooves and drive the limiting plates to radially expand through axial movement. As a further scheme of the invention, a positioning cylinder i