Wellhead wall-hook packer

Abstract

The invention discloses a wellhead wall-hook packer. The packer comprises a bottom plate, a rubber core, a slip and an upper cover plate, wherein the bottom plate, the rubber core, the slip and the upper cover plate are connected in sequence through bolts. During specific use, the wellhead wall-hook packer is arranged on the outer side of an inner casing in a sleeving manner, the bolts are screwed, the slip and the rubber core are squeezed by the upper cover plate and the bottom plate at the same time, the rubber core is expanded to pack a casing annulus, the slip moves down and is jogged in the surface of the inner casing to prevent the wellhead wall-hook packer from moving upwards under the action of annulus pressure. According to the scheme, annulus packing is realized through the wellhead wall-hook packer, so that the problems of blow-by and annulus belt pressure caused by poor cementing quality of the annulus are effectively solved; compared with the mode for injecting cement slurry into the annulus through a drilling machine in the prior art, the packer has the advantages that the construction difficulty is reduced to guarantee that the entire repair operation is simple and reliable.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a wellhead hanging packer. Background technique [0002] With the prolongation of the production time of oil and gas wells, due to the low cementing replacement efficiency or unreasonable cement slurry design, plus the formation stress change, temperature change, pressure change after cementing and the production time, the cement sheath seal failure , wellhead blow-by gas and annular pressure and other problems appear accordingly, seriously restricting the safe production of oil and gas wells. [0003] In the prior art, the conventional remedial method to solve the problem of gas bleeding at the wellhead and pressure in the annulus is to use a drilling rig for workover operations, and inject or squeeze cement into the annulus through the drilling rig to seal the fractures. Depending on the degree and permeability, the cement squeezing operation may not be able to s...

AI Technical Summary

Problems solved by technology

[0002] With the prolongation of the production time of oil and gas wells, due to the low cementing replacement efficiency or unreasonable cement slurry design, plus the formation stress change, temperature change, pressure change after cementing and the production time, the cement sheath seal failure , problems such as wellhead blow-by and annular pressure appear accordingly, seriously restricting the safe production of oil and gas wells

[0003] In the prior art, the conventional remedial method to solve the problem of gas bleeding at the wellhead and pressure in the annulus is to use a drilling rig for workover operations, and inject or squeeze cement into the annulus through the drilling rig to seal the fractures. Depending on the degree and permeability, the cement extrusion operation may not be able to seal the channel of gas channeling. At the same time, the use of drilling rigs for workover operations is very dangerous, which is likely to cause personal injury and damage to equipment or even be scrapped.

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