A recoverable hydraulic packer

Abstract

The invention relates to a recyclable type hydraulic packer and belongs to the field of oil and gas well operation downhole tools. The packer comprises an inner center pipe, an outer center pipe, a releasing claw, a bushing, a balanced connector, an oil drainage sleeve, an upper piston, a lower piston and a slip. The inner center pipe is sleeved with the outer center pipe. The releasing claw is arranged on one side of the outer center pipe. The bushing is arranged on one side of the releasing claw. A shear ring is installed on one side of the bushing through the balanced connector and a guide ring. The recyclable type hydraulic packer can bear the two-way pressure from the upper portion and the lower portion of the packer; 52 MPa high pressure can be borne by a sealing mechanism; when the slip enters a well and is unblocked and taken out, the slip is pressed through a spring and only stretches out when the cone acting force is applied to the slip under the action of the hydraulic force, and thus the advanced setting risks of a conventional packer can be effectively avoided; the packer is designed by adopting an integrated inner center pipe and can be directly connected with an oil pipe, the number of transfer buckle parts is decreased, the structure can be made more compact, the drift diameter is increased, and meanwhile the buckle disengagement risk of transfer buckles is avoided, so that the cost is reduced.

Description

technical field [0001] The invention relates to a recoverable hydraulic packer, belonging to the field of downhole tools for oil and gas well operations. Background technique [0002] Packers are widely used in oilfield layered water injection, acidizing, fracturing, sand control, channel finding and channel sealing, etc., mainly to achieve the isolation of the annulus between tubing and casing or between tubing and formation. Retrievable packers are divided into two types: mechanical and hydraulic. Due to structural design reasons, mechanical packers use rotating strings to transmit torque. This structure is not suitable for ultra-deep wells and highly deviated wells where torque transmission is difficult. and horizontal wells. Conventional recoverable hydraulic packers generally have the problem of low pressure bearing capacity, and their pressure is generally below 35MPa. Due to the need for unsealing and recovery, the center pipe is usually connected in the form of an ...

AI Technical Summary

Problems solved by technology

Due to the need for unsealing and recovery, the center pipe is usually connected in the form of an adapter buckle, which cannot effectively transmit torque when the well structure is complex, and there is a safety hazard of tripping

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