Two-way slip recoverable hydraulic packer

Abstract

The invention provides a two-way slip recoverable hydraulic packer. The packer comprises a middle mandrel, a first shearing fixing piece, a second shearing fixing piece, a third shearing fixing piece,a hydraulic cylinder outer cylinder, a locking mandrel, a limiting assembly, an annular piston, a locking ring assembly, a rubber cylinder, a cone and a slip, wherein the hydraulic cylinder outer cylinder, the locking mandrel and the limiting assembly are sequentially arranged on the outer wall of the middle mandrel in a sleeving mode from top to bottom; and the annular piston, the locking ring assembly, the rubber cylinder, the cone and the slip are sequentially arranged on the outer wall of the locking mandrel in a sleeving mode from top to bottom; a first cavity is formed between the hydraulic cylinder outer cylinder and the locking mandrel; a closed second cavity is defined by the locking mandrel and the middle mandrel; the locking mandrel and the middle mandrel are connected throughthe first shearing fixing piece; the cone is connected with the locking mandrel through the third shearing fixing piece; the slip is arranged on the conical surface of the cone in a sleeving mode andcan move upwards relative to the cone and be in an unfolded state; and the lower end face of the slip makes contact with the upper end face of the limiting outer cylinder. The packer can bear pressureand tension in two directions, the setting procedure is simple, and the packer can be unsealed and recovered.

Description

technical field [0001] The invention relates to the technical field of well testing and completion equipment for oil and gas wells, in particular to a two-way slip retrievable hydraulic packer. Background technique [0002] At present, the oil testing and completion operations of most exploration wells or evaluation wells need to be completed in two steps. The first step is to lower the test pipe string with a series of tools such as test packer, test valve, and electronic pressure gauge to the vicinity of the production layer, and then conduct a blowout production test. plugging, this step is mainly for the purpose of obtaining formation data; if there is production, it is necessary to complete the well and put it into production, then go to the second step, and re-perform the wellbore preparation (including drilling plugs, wall scraping, well drilling, etc.), and then run into the belt to complete the well The completion strings of a series of tools such as packers and do...

AI Technical Summary

Problems solved by technology

Packers are required to seal and fix the tubing string and casing during oil testing and well completion and production. Usually, the packers used are permanent packers, which do not have the function of unsealing. After the oil testing, they need to be removed When testing the tubing string, it is necessary to grind and salvage the permanent packer and its lower string, which is time-consuming and laborious, and the packer can only be used once, resulting in waste

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