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CN-121993081-A - Top packer of metal deformation internal bone type tail pipe hanger

CN121993081ACN 121993081 ACN121993081 ACN 121993081ACN-121993081-A

Abstract

The invention discloses a top packer of a metal deformed inner bone type tail pipe hanger, which comprises an inner cylinder and an outer cylinder, wherein the bottom of a setting limit cylinder is fixedly connected with the top of a setting central pipe, the outer cylinder comprises a setting stress cylinder, a setting force transmission sleeve, a setting centralizing ring and a metal deformed inner bone which are sequentially connected, the metal deformed inner bone is made of a special alloy material which can deform under the action of pressure and has enhanced strength after deformation, the metal alloy inner bone is of a cylindrical structure, the side wall of the cylindrical structure is of an arc-shaped structure with an outwards arched middle position, the wall thickness at the top position of the arc-shaped structure is minimum, and the wall thicknesses at the two sides of the top position are gradually thickened. The invention solves the problems of insufficient pressure bearing capability, reduced sealing performance, large influence of temperature, easy pre-setting and the like of the traditional liner hanger top packer under the condition of high-pressure high Wen Chaoshen gas layer active well by arranging the metal deformed endoskeleton.

Inventors

  • XIAN YONG
  • LU YAO
  • SHI YAOWEI
  • XIAO YONG
  • PAN ZHIQIANG
  • WANG QING
  • YU XIN
  • YANG DAILIN
  • ZHANG JIANJUN
  • BIN GUOCHENG

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团川庆钻探工程有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. The top packer of the metal deformation inner bone type tail pipe hanger is characterized by comprising an inner cylinder (2) and an outer cylinder (1), wherein the outer cylinder (1) comprises a setting stress cylinder (3), a setting force transmission sleeve (4), a setting centralizing ring (5) and a metal deformation inner bone (6) which are sequentially connected, the setting stress cylinder (3), the setting force transmission sleeve (4), the setting centralizing ring (5) and the metal deformation inner bone (6) are sleeved outside the inner cylinder (2) and can slide along the axial direction of the inner cylinder (2), the bottom of the metal deformation inner bone (6) is fixedly connected with the inner cylinder (2) through a setting bearing ring (7), the metal deformation inner bone (6) is made of special alloy materials which can deform under the action of pressure and have enhanced strength after deformation, the metal alloy inner bone is of a cylindrical structure, the side wall of the cylindrical structure is of an arc structure which is outwards arched in the middle position, the wall thickness at the top position of the arc structure is minimum, and the wall thickness at the two sides of the top position is gradually thickened.
  2. 2. The metal deformation internal bone type liner hanger top packer according to claim 1, wherein the inner cylinder (2) comprises a setting limit cylinder (8) and a setting central tube (9), the bottom of the setting limit cylinder (8) is fixedly connected with the setting central tube (9), and a step structure (10) for limiting the moving distance of the setting force cylinder (3) is arranged at a position corresponding to the outer side of the setting limit cylinder (8) and the inner side of the setting force cylinder (3).
  3. 3. The top packer of the metal deformation internal bone type tail pipe hanger according to claim 1, wherein a setting shear pin (11) for restraining relative movement between the setting stress cylinder (3) and the setting limit cylinder (8) is arranged between the setting stress cylinder (3) and the setting limit cylinder (8).
  4. 4. The top packer of the metal deformation internal bone type liner hanger according to claim 1, wherein an anti-withdrawal tooth sleeve (12) is arranged on the inner side of the setting force transmission sleeve (4), an annular one-way tooth structure matched with the anti-withdrawal tooth sleeve (12) is arranged on the outer side of the setting central tube (9), and the anti-withdrawal tooth sleeve (12) and the annular one-way tooth structure are mutually matched to form one-way self-locking.
  5. 5. The top packer of the metal deformed inner bone type liner hanger according to claim 1, wherein a rubber sealing unit (13) is sleeved on the outer side of the metal deformed inner bone (6), and the inner side of the rubber sealing unit (13) is tightly connected with the outer side of the metal deformed inner bone (6).
  6. 6. The top packer of the metal deformed internal bone type liner hanger of claim 1, wherein a plurality of stress grooves (14) are formed on two sides of the outer side vertex position of the metal alloy internal bone.
  7. 7. The top packer of the metal deformation endoskeleton hanger as claimed in claim 6, wherein both sides of the stress groove (14) are provided with outward protrusions.
  8. 8. The top packer of the metal deformed inner bone liner hanger as claimed in claim 1, wherein a groove structure (15) for installing a seal is provided on the inner side of the metal deformed inner bone (6).
  9. 9. The top packer of the metal deformation internal bone type tail pipe hanger according to claim 1, wherein a centralizing edge structure (16) is arranged on the outer side of the setting centralizing ring (5), the centralizing edge structure (16) is a discontinuous arc structure with the outer diameter being larger than the outer diameter of the rubber sealing unit (13) uniformly distributed on the circumference of the outer side of the setting centralizing ring (5), and the number of the discontinuous arc structures is 4-6.
  10. 10. The top packer of the metal deformation inner bone type liner hanger according to claim 1, wherein a plurality of metal alloy inner bones are arranged, and every two metal alloy inner bones are arranged at intervals through a steel spacer ring.

Description

Top packer of metal deformation internal bone type tail pipe hanger Technical Field The invention relates to the technical field of underground tool manufacturing in the petroleum and natural gas industry, in particular to a top packer of a metal deformation internal bone type tail pipe hanger. Background In the petroleum and natural gas exploration and development process, the liner cementing operation is an important link for ensuring the safe and stable production of an oil and gas well. The packer is used as one of key equipment in liner cementing operation, and the performance of the packer directly influences the cementing quality and the operation safety. Conventional packers mainly adopt a mode of compressing or expanding rubber barrels to realize sealing, but under the condition of active well conditions of complex deep wells and high-pressure high Wen Chaoshen gas layers, the conventional packers often have the following problems: 1. And the packer is set in advance, namely, the packer is set when the packer does not reach a preset position due to factors such as material performance, narrow annular design gap and the like, a tubular column is required to be lifted, and the packer type liner hanger is replaced and then is put in again, so that the drilling time efficiency and the underground operation risk are increased. 2. The pressure bearing capacity of the traditional packer is insufficient, so that the pressure bearing capacity of the traditional packer cannot meet the field operation requirement in a high-pressure high-temperature environment, and leakage or rupture is easy to occur. 3. The sealing performance is reduced, namely the rubber cylinder after expansion sealing is easy to slip or topple under the influence of factors such as circulation displacement, rock debris wrapping and the like, so that the sealing performance is reduced. 4. The rubber sleeve material in the traditional packer is easy to age and deform under the high-temperature environment, and the sealing effect is affected. Therefore, aiming at the problems, the invention provides a novel hanger top packer structure so as to improve the pressure bearing capacity, the sealing performance and the operation safety of the packer. The invention patent application with the publication number of CN118128467A discloses a packing device, and aims to solve the technical problems that the existing packer is in a non-sealing state or the packing effect is not ideal when being applied to different working conditions. The packing device comprises a central tube and a rubber cylinder assembly, wherein the rubber cylinder assembly is sleeved on the central tube and can slide along the axial direction of the central tube, and the rubber cylinder assembly is provided with two ends which are far away from each other along the axial direction of the central tube, wherein only one end of the rubber cylinder assembly is fixed on the central tube. According to the invention, the rubber cylinder assembly is compressed and deformed in a compression mode, and the deformed rubber cylinder assembly is tightly contacted with the inner wall of the naked eye, so that the effective sealing of the naked eye well is realized. However, the sealing capacity of the patent is limited, namely, the main sealing is realized by tightly attaching rubber to the inner wall of the sleeve, and the sealing capacity of the rubber in a high-temperature underground environment is far lower than that of metal because of the fact that: 1. temperature adaptability, namely, rubber has limited high temperature tolerance (rubber has the characteristic of rapidly decreasing hardness and strength with temperature rise), and a metal sealing member can keep stable sealing effect in a high-temperature environment. The packer is used in high temperature (80-260 deg.c) downhole environment. 2. The metal sealing element has better pressure resistance under high-pressure environment and can bear extremely high pressure, and the rubber sealing element has better sealing effect under low-pressure environment and can deform under high pressure. The metal endosteal packing pressure is higher. 3. The metal seal has excellent corrosion resistance and is suitable for corrosive environment, while the rubber seal is sensitive to certain chemical substances and is easy to age and become brittle. The downhole environment is a corrosive environment of acids, bases, oils. 4. The service life of the metal sealing ring is generally longer, and the service life of the rubber sealing ring is relatively shorter. The multi-section uniform protrusion inner bone structure of the rubber barrel is low in practicality, the expansion sealing starting pressure cannot be accurately controlled when the rubber barrel is axially stressed, the rubber barrel is poor in stability, the rubber barrel is overlong due to the multi-section uniform protrusion structure of the metal inner skeleton, the specific expansion seal