Recoverable downhole packer resistant to high temperature and high pressure

Abstract

The invention discloses a recoverable downhole packer resistant to high temperature and high pressure. The recoverable downhole packer comprises a center pipe, a power part, a first slip part, a packing part, a second slip part and a second shell, wherein, the power part comprises a first shell, a cylinder body, a piston, a sliding sleeve and a control pipeline; the first slip part can support the inner wall of an oil well casing under the downward pressing and jacking of the sliding sleeve, and can synchronously move downwards along with the downward movement of the sliding sleeve; the packing part comprises a packing rubber sleeve, a high-temperature-resistant rubber sleeve and a base plate which are arranged on the center pipe in a sleeving mode and located below the first slip part; the second slip part can support the inner wall of the oil well casing under the downward pressing and jacking of the sliding sleeve; and the second shell is fixed to the bottom end of the center pipe and fixedly connected with the bottom end of the first slip part. The packer is simple in structure, the structural stability is improved by adopting two clamping connection, and the high-pressure resistance is stronger; the high-temperature-resistant rubber sleeve is arranged to improve the high-temperature-resistant property; and the problems that in the prior art, the packer is complex in structure, large in setting and unsetting difficulty, long in period, high in operation cost and the like are solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a recoverable downhole packer resistant to high temperature and high pressure. Background technique [0002] The packer is a special tool used to isolate oil, gas and water layers in downhole casing or open hole. It shortens the length and enlarges the diameter of the rubber tube through the action of external force to seal the oil and collar space, and separate the upper and lower oil (gas, water) layers of the packer, so as to realize the layered test, layered oil recovery, and layered transformation of oil and water wells and seal the water layer. It is widely used in drilling, cementing, testing, and well completion, and can be used for oil and gas well production, water injection (gas), interlayer isolation, separate injection and production, multi-layer testing, stimulation measures, etc. With the deepening of the production depth of oil wells, the formati...

AI Technical Summary

Problems solved by technology

[0003] However, due to structural limitations, the existing packers have the problems of non-recyclability, poor pressure resistance and high temperature resistance, which lead to their limited use range and cannot meet the Requirements for the use of deep wells and appraisal wells

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