Well-flushing step-by-step unsetting packer

Abstract

The invention discloses a well-flushing step-by-step unsetting packer, which comprises an upper joint, a well flushing cylinder tube, a rubber tube shaft, a rubber tube, a center pipe, a locking device, a main piston, a connecting sleeve and a lower joint. The well-flushing step-by-step unsetting packer has the advantages that (1) an inlet of a well-flushing passage is of a structure with a plurality of slender seams, so that the flow-passing area of the passage is sufficiently large, large-particle solid phase impurities can be prevented from entering the well-flushing step-by-step unsetting packer to block an inner passage, and the smoothness of a tool inner cavity well-flushing passage is ensured; (2) the well-flushing passage of the packer adopts a streamline design, so that machine impurities and solid phase particles can easily flow out, and passage blockage due to accumulation cannot easily occur; and (3) a step-by-step unsetting mechanism is arranged inside the packer, so that during the multi-stage use, an upper-stage packer is firstly unset; then, a lower-stage packer is unset; the unsetting force is not accumulated during the unsetting; and the packer is enabled to be easily unset.

Description

technical field [0001] The invention relates to the technical field of oil collection, in particular to a washable well-washable step-by-step unpacking packer. Background technique [0002] Washable well packers are widely used in layered water injection wells in major oilfields in my country. They are mainly used to meet the well washing requirements of separate injection wells. The well cleaning channel of the separator performs reverse circulation cleaning on the whole well string to remove sand, dead oil, mechanical impurities and other substances in the wellbore, effectively solving the problems of sand buried oil layers, blockage of water distribution nozzles, and obstacles encountered in fishing, testing and matching. However, there are still two problems: one is that the liquid inlet hole of the well flushing channel of the commonly used packer is generally round or rectangular with a large area. , mechanical impurities, dead oil, and solid particles in high-pressure w...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a washable well-washable step-by-step unpacking packer to solve the technical problem that the well-washable packer in the prior art is easy to block or not tightly closed.

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