High-pressure self-sealing cup assembly for reseatable packers

Abstract

The invention relates to the technical field of well repair of oil fields, in particular to a repeatedly-setting high-pressure self-sealing leather cup assembly for a packer. The repeatedly-setting high-pressure self-sealing leather cup assembly comprises a rubber leather cup which is sleeved on a sealing ring; a leather cup press cap is in threaded connection with the upper part of the rubber leather cup; the repeatedly-setting high-pressure self-sealing leather cup assembly is characterized in that: a plurality of leather cup shoulder protection plates are arranged around the circumference of the shoulder of the rubber leather cup; and the radial section of each leather cup shoulder protection plate is circular arc. The opened leather cup shoulder protection plates are arranged on the shoulder of the leather cup, and are coincided with the inner wall of a sleeve pipe along with the expansion of the leather cup; and the open seams of lower pivot angles of the leather cup shoulder protection plates are compensated by elastic compensation plates, so the shoulder of the leather cup can be provided with a complete rigid annular protection cover, and the condition that the leather cup bears high pressure, so the shoulder is protruded, sheared and damaged can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of oil field workover, in particular to a high-pressure self-sealing leather bowl assembly for a packer that can be repeatedly set and sealed. Background technique [0002] In oil field acidizing, fracturing and other operations, a self-sealing packer is often used, that is, a leather cup packer. The rubber cup packer is connected with the tubing and transported to the target well section of the downhole operation, the rubber cup is sleeved on the sealing slip ring, and the rubber cup is connected with a cup pressure riser above the cup. The primary seal is formed by the interference fit between the skirt of the cup and the inner wall of the casing. During construction, the high-pressure liquid on the well is transported to the working formation below the packer through the tubing, and the inner cavity of the cup is under pressure under the action of the high-pressure liquid. Ascending, compress the packer ...

AI Technical Summary

Problems solved by technology

The application shows that these two methods can improve the compressive capacity of the leather cup to a certain extent, but they still cannot solve the problem of underground high-pressure operations. Due to the large difference in hardness and deformation between rubber and steel wire, the During the pressure deformation process of the bowl, it is easy to separate from the rubber body, and even cut off the cup

High-hardness rubber has low elasticity and poor sealing performance. When the operating pressure value exceeds the mechanical performance limit of the rubber, it will also cause shear damage to the shoulder, resulting in loss of seal and resulting in operation failure.

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