Non-throttling self-service unsealed packer

Abstract

The invention discloses a non-throttling self-service unsealed packer which comprises an upper connector, an upper central pipe, a sealing mechanism, a spring central pipe, a spring self-service unsealing mechanism, a lower central pipe, a setting-dissoluble unsealing mechanism and a lower connector. No throttling or setting needs to be conducted for the non-throttling self-service unsealed packer, and the setting process is convenient to control; limiting steps are arranged in the packer, it is avoided that the sealing effect is affected by the excessive compression of a rubber cylinder; by means of the compressed rubber cylinder, the borne pressure difference is large, and the setting effect is good and stable; large-discharge and large-scale cracking construction refitting can be realized; by means of the spring self-service unsealing mechanism, unnecessary advanced setting generated in the pipe column put-down process is avoided; after cracking construction ends, the rubber cylinder of the packer is rapidly unsealed under the dual effects of the rebound force of the rubber cylinder and the self-service unsealing force of a spring; by means of the setting-dissoluble unsealing mechanism, under the high pressure in a well, the rapid unsealing of the packer can still be ensured.

Description

technical field [0001] The invention belongs to the technical field of fracturing operations in oil and gas fields, and in particular relates to a downhole packer for fracturing operations in oil and gas fields, in particular to an unthrottled self-service unpacking packer. Background technique [0002] With the deepening of domestic oil and gas field development, the K344 packer layered fracturing technology has become the main technology for vertical well layered fracturing reconstruction in domestic oil and gas fields. However, this technology also has some limitations, which restrict its further development, for example: ①The throttling set packer needs to be produced by the throttling bottom valve and the throttling sandblasting sliding sleeve, which limits the construction displacement, sand addition The volume and construction scale increase the surface pump pressure, which sacrifices the construction efficiency and cannot meet the needs of large displacement and larg...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-throttling self-service unpacking packer to solve the problem that the existing K344 packer needs to be set through throttling, cannot meet the needs of large displacement and large-scale fracturing construction, and the process of lowering Unnecessary setting in advance and the difficulty or failure to pull out the pipe string after pressure relief are likely to occur in the process

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