Liner hanger assembly and top mechanical expansion type packer thereof

Abstract

The invention provides a liner hanger assembly and a top mechanical expansion type packer thereof, and belongs to the field of oil and gas field drilling engineering technology and equipment downholeoperation tools. The mechanical expansion type packer comprises a connecting piece capable of being broken under shearing force, a lower connector, a central pipe, a setting push cylinder, a retainingring, an adjusting screw sleeve, a first expansion ring, a first sealing conical ring, a rubber cylinder, a second sealing conical ring and a second expansion ring, wherein the setting push cylinder,the retaining ring, the adjusting screw sleeve, the first expansion ring, the first sealing conical ring, the rubber cylinder, the second sealing conical ring and the second expansion ring are arranged on the central pipe in a sleeve mode, the first expansion ring and the second expansion ring can expand in the radial direction, the rubber cylinder can climb to the outer circumference of the first sealing conical ring and / or the second sealing conical ring under the extrusion effect, an annular gap is filled with the radial size of the rubber cylinder so as to achieve sealing. According to the liner hanger assembly and the top mechanical expansion type packer thereof, the covering principle of a traditional compression packer is changed, the larger annulus gap mechanical packing is achieved through a thin-wall rubber cylinder, larger-displacement well cementation construction is achieved, and the well cementation quality and the well cementation anti-channeling effect can be favorablyimproved.

Description

technical field [0001] The invention relates to the field of oil and gas field drilling engineering technology and equipment for downhole operation tools, in particular to a liner hanger assembly and a top mechanical expansion packer for oil and gas field liner cementing construction. Background technique [0002] In the liner cementing construction of oil and gas wells, packers or liner hangers with top packers are often used to prevent oil, gas, water, etc. from channeling, effectively achieve permanent mechanical isolation of the annular space, and improve cementing performance. quality. At present, the traditional packer structures used in liner cementing of oil and gas wells mainly include compression, expansion and expansion structures. [0003] Chinese Patent No. "CN209430154U" discloses a top packer assembly of a pack-off liner hanger, including a central tube, and the outer wall of the central tube is provided with a force transmission sleeve, a centering ring, an ...

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Problems solved by technology

[0004] The above two patents are more suitable for sealing small annular gaps, but they cannot increase the annular flow area of ​​the liner hanger. When the annular gap is further increased, the sealing pressure drops significantly, and the permanent mechanical seal of the annular space The septum will fail, which is not conducive to improving the cementing quality

[0005] Chinese Patent No. "CN101173601" discloses a rotatable hydraulically expandable liner hanger, which realizes the structural integration of the liner hanger seat, packer seat seal, and liner drop, which makes its seat hanger , Seat sealing and throwing away can only be completed at one time after the cement grout is replaced in place. At this time, the cement slurry is thickening.

China Patent No. "CN200620010274.X" discloses a compensating expansion water injection packer. In this patent, the rubber tube is radially expanded by injecting fluid into the rubber tube, filling the annular space, and achieving isolation. The rubber tube of the packer is relatively thin, and the annular space that can be sealed is relatively large, but the structure of the packer is relatively complicated, and the manufacturing cost is high

[0006] In summary, the compression packer in the prior art has the disadvantages of large radial design space and small annulus sealing gap, which cannot significantly increase the flow area of ​​the annulus; the expansion packer has the disadvantages of complex structure and high cost

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