Anchor packer with hydraulic setting function and rotation unsetting function

Abstract

The invention relates to an anchor packer with a hydraulic setting function and a rotation unsetting function, and belongs to the field of borehole operation tools for oil gas wells. The anchor packer comprises a center pipe, an upper connector, a lower connector, a pair of slips, a piston sleeve and a release sleeve. The upper connector is arranged at one end of the center pipe, and a C-shaped ring is arranged at the other end of the center pipe. An inner sleeve is arranged on the portion, located on one side of the connector, of the center pipe. An upper slips cone and a lower slips cone are clamped to the inner sleeve through a cone release shaft and key blocks A. The slips are assembled between the upper slips cone and the lower slips cone. The anchor packer is compact in structure, setting and anchoring are achieved, and the unsetting mechanism is exquisite in design; setting is safe, it can be avoided that setting is conducted in advance, and step-by-step unsetting can be easily completed when multiple packers are used at the same time; and the problem that multi-stage unsetting is difficult in the prior art is solved. The anchor packer can bear the pressure from the position above the anchor packer and the pressure below the anchor packer, and is particularly suitable for water (gas) injection, interlayer isolation, split injection and split explosion, multilayer testing and stimulation measure operation in plumb shafts and slightly-deviated wells.

Description

technical field [0001] The invention relates to a slip packer which is hydraulically set and rotated for unsealing, and belongs to the field of downhole operation tools for oil and gas wells. Background technique [0002] The packer is a special tool used to isolate oil, gas and water layers in downhole casing or open hole. Through the action of external force, the length of the rubber tube is shortened and the diameter is increased to seal the annular space of the oil and sleeve, and separate the oil (gas, water) layers above and below the packer, so as to realize the layered testing of oil and water wells, layered oil recovery, and separation. Layer water injection, layer transformation and sealing water layer. It is widely used in drilling, cementing, testing, well completion, etc., and can be used for production, water injection (gas), interlayer isolation, separate injection and production, multi-layer testing, stimulation measures, etc. [0003] Due to structural rea...

AI Technical Summary

Problems solved by technology

[0003] Due to structural reasons, traditional hydraulic packers usually adopt the structure of shear pins, which are directly lifted and unsealed, and their suspension capacity is poor. In addition, during downhole operations, the pipe string is often stretched and stretched due to changes in temperature and pressure, resulting in sealing The packer is unsealed in advance; and when multiple packers are used together, a large unseal force will be generated, which will cause a great risk of unseal; and the existing conventional hydraulic packers generally have low pressure bearing capacity, The small internal diameter is not suitable for large-bore completions and multi-layer combination packer completions

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