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CN-122014146-A - Packer for open hole well

CN122014146ACN 122014146 ACN122014146 ACN 122014146ACN-122014146-A

Abstract

The invention relates to the field of downhole tools for petroleum and natural gas exploitation, in particular to a packer for an open hole well, wherein a fixing component used for being clamped on the wall of the open hole well is movably connected to a first connecting component, a second connecting component used for being communicated with a central pipe is arranged on the left side of a driving component, a sealing device comprises an arc-shaped metal sheet arranged on the driving component, a sealing component used for sealing the open hole well is arranged on the outer side of the arc-shaped metal sheet, when an adaptive profiling rubber cylinder contacts an irregular well wall, a bulge with high contact pressure can reversely press a local rubber cylinder, the pressure is transmitted to an elastic rubber cylinder, so that the pressure of fluid in the capsule is increased, and because the fluid in a storage cavity is incompressible and communicated, the high pressure can drive the fluid to flow to a corresponding area with lower pressure, so that the fluid pressure can push the elastic capsule and the adaptive profiling rubber cylinder to continuously expand outwards until the pit is tightly filled in the concave position of the well wall.

Inventors

  • TIAN TAO
  • LI JUN
  • LIU JIANGTAO

Assignees

  • 新疆罡拓能源科技有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (9)

  1. 1. The packer for the open hole well comprises a central pipe (100), and is characterized in that a fixing device (200) used for being clamped on the wall of the open hole well is sleeved on the pipe body of the central pipe (100), a driving device (300) used for moving left and right is sleeved on the pipe body of the central pipe (100), a sealing device (400) used for sealing the open hole well is sleeved on the driving device (300), the fixing device (200) comprises a first connecting component (210) sleeved on the central pipe (100), a fixing component (220) used for being clamped on the wall of the open hole well is movably connected on the first connecting component (210), the driving device (300) comprises a driving component (310) sleeved on the central pipe (100) and used for driving the fixing component (220) to open, a second connecting component (320) used for being communicated with the central pipe (100) is arranged on the left side of the driving component (310), and an arc-shaped metal piece (420) used for sealing the open hole well is arranged on the outer side of the arc-shaped metal piece (420).
  2. 2. The packer for the open hole well as claimed in claim 1, wherein the first connecting component (210) comprises a connecting ring (211) sleeved on the central pipe (100), clamping grooves (212) used for being hinged with the fixing component (220) are formed in a ring body of the connecting ring (211), and the number of the clamping grooves (212) is four.
  3. 3. The packer for an open hole well as recited in claim 2, wherein the stationary assembly (220) comprises slips (221) disposed in the clamping groove (212) for rotation, and an outer sidewall of the slips (221) is provided with a ring (222).
  4. 4. The packer for open hole well as claimed in claim 3, wherein the driving assembly (310) comprises a front pressing cylinder (311) sleeved on the central pipe (100), and a conical table (312) for driving the clamping groove (212) to expand is fixedly arranged at the right end of the front pressing cylinder (311).
  5. 5. The packer for the open hole well as claimed in claim 4, wherein the second connecting component (320) comprises a rear pressing cylinder (321) arranged at the left end of the front pressing cylinder (311), a through hole (322) used for being communicated with the central pipe (100) is formed in the pipe body of the rear pressing cylinder (321), and four through holes (322) are formed.
  6. 6. The packer for the open hole well of claim 4, wherein the sealing assembly (410) comprises a self-adaptive profiling rubber cylinder (411) sleeved on the conical table (312) and used for sealing the open hole well, and a plurality of miniature hard wear-resistant particles are inlaid on an outer working surface of the self-adaptive profiling rubber cylinder (411).
  7. 7. The packer for the open hole well as claimed in claim 6, wherein an elastic capsule (412) for protecting the self-adaptive profiling rubber cylinder (411) is arranged on the inner side of the self-adaptive profiling rubber cylinder (411), and the elastic capsule (412) is wrapped on the outer side of the arc-shaped metal sheet (420).
  8. 8. The packer for open hole wells according to claim 7, wherein the elastic capsule (412) is provided with a storage chamber (413) for filling with incompressible fluid.
  9. 9. The packer for open hole wells according to claim 1, wherein the number of the arc-shaped metal sheets (420) is several, and the number of the arc-shaped metal sheets (420) are distributed on the pipe body of the conical table (312) in a circumferential array.

Description

Packer for open hole well Technical Field The invention relates to the field of downhole tools for petroleum and natural gas exploitation, in particular to a packer for an open hole well. Background In field development, it is often necessary to conduct a separate fracturing, separate testing or separate production in open hole sections, where a packer is a critical tool to achieve interval separation. However, the open hole wall is composed of natural rock, the surface of which is rough, rugged and irregularly shaped, and the hardness of the rock in different strata is greatly different. The conventional open hole packer mainly depends on the expansion of a large rubber cylinder with higher hardness under the action of strong mechanical force or hydraulic pressure, and is forced to squeeze and deform so as to adapt to the well wall. However, when the open hole packer is used for sealing the rubber cylinder well wall, the well wall is incomplete and smooth, so that for irregular well walls, the hard rubber cylinder is difficult to completely fill all gaps, leakage channels are easy to form locally, so that the sealing is invalid, and meanwhile, the fragile rock stratum can be crushed by huge expansion force, so that the well wall is unstable, scraps are generated, and even drill sticking accidents are caused. Therefore, a packer for open hole is proposed to solve the above problems. Disclosure of Invention In order to overcome the defects of the prior art and solve at least one technical problem in the background art, the invention provides a packer for an open hole well. The packer for the open hole well comprises a central pipe, wherein a fixing device used for being clamped on the wall of the open hole well is sleeved on the pipe body of the central pipe, a driving device used for moving left and right is sleeved on the pipe body of the central pipe, a sealing device used for sealing the open hole well is sleeved on the driving device, the fixing device comprises a first connecting component sleeved on the central pipe, the first connecting component is movably connected with a fixing component used for being clamped on the wall of the open hole well, the driving device comprises a second connecting component sleeved on the central pipe and used for driving the fixing component to open, the left side of the driving component is provided with a second connecting component used for being communicated with the central pipe, the sealing device comprises an arc-shaped metal sheet arranged on the driving component, and the outer side of the arc-shaped metal sheet is provided with a sealing component used for sealing the open hole well. Preferably, the first connecting component comprises a connecting ring sleeved on the central tube, the connecting ring is fixed with the central tube relatively through pins or interference fit, clamping grooves used for being hinged with the fixing component are formed in the ring body of the connecting ring, the number of the clamping grooves is four, and hinge holes are formed in the side faces of the clamping grooves and used for being movably connected with the fixing component. Preferably, the fixing assembly comprises a slip arranged in a clamping groove and used for rotating, the inner end of the slip is hinged in the clamping groove through a pin shaft, so that the slip can be outwards opened or inwards closed around a hinge point like a door plate, the outer wall of the slip is provided with hard teeth with transverse grooves so as to increase friction force with an irregular rock well wall, the outer side wall of the slip is provided with a circular ring, and the inner side of the slip is connected through a common circular ring and can axially slide to synchronously push or pull all the slips to rotate around the hinge point for driving conveniently. The driving assembly comprises a front pressing cylinder sleeved on the central pipe, wherein the right end of the front pressing cylinder is fixedly provided with a conical table for driving the clamping groove to be unfolded, the right end of the front pressing cylinder is integrally formed or fixedly connected with a conical table with the outer diameter gradually increasing to the right, the conical surface of the conical table is matched with the inner inclined surface of the slips, when the front pressing cylinder moves rightwards relative to the connecting ring, the conical table is extruded into the inner side of the slips to force the slips to be unfolded radially outwards around the hinging point of the slips until teeth on the outer wall of the slips bite into the naked eye well wall, and anchoring is achieved. The connecting assembly II comprises a rear pressing cylinder arranged at the left end of the front pressing cylinder, the rear pressing cylinder is sleeved on the central tube, the right end of the rear pressing cylinder and the left end of the front pressing cylinder can be fixedly connected through