A long-term expansion packer with double-rubber cartridges and double-unsealing methods

Abstract

The invention discloses a long-acting double-rubber-cylinder double-unsealing-mode expansion packer, and belongs to the technical field of petroleum. The long-acting double-rubber-cylinder double-unsealing-mode expansion packer includes two sections of central pipes; expansion rubber cylinders are fixedly arranged on the outer side walls of the two sections of central pipes; the two ends of each expansion rubber cylinder are fixedly connected in a rubber cylinder seat and a middle joint separately; the rubber cylinder seats are connected in connectors; one ends of the connectors are fixedly connected with upper joints; and a middle joint of one section of central pipe is connected to the upper joint of the other section of central pipe through a rubber ring; therefore, the packer is maintained in the setting state, the expansion rubber cylinders are not unsealed, layer crossing during stopping injection is prevented, and the packer is prevented from continuing to descend and collide with obstacles; therefore, the packer is protected, and it is ensured the packer is not easily damaged; and the packer itself adopts the double expansion rubber cylinders for seal and has the characteristics of high pressure bearing capacity, large sealing area, reliable sealing and large load bearing, which has a stronger support force for a pipe string and prolongs the validity period of the pipestring.

Description

technical field [0001] The invention belongs to the technical field of petroleum, and in particular relates to a long-acting expansion packer with double-rubber cartridges and double-unsealing methods. Background technique [0002] A packer refers to a downhole tool that has elastic sealing elements to seal off the annular space between pipe strings of various sizes and wellbore and between pipe strings, and isolate production layers to control fluid production and protect casings. There are many classifications of packers, including self-sealing packers, compression packers, expansion packers, etc. [0003] However, the existing expandable packer performs sealing before reaching the preset sealing position, and cannot perform sealing at the preset sealing position, and its function is relatively single. As a result, interlayer phenomenon is prone to occur, and after encountering obstacles during the downhole process, it is easy to be damaged by collision and lacks protecti...

AI Technical Summary

Problems solved by technology

[0003] However, the existing expandable packer performs sealing before reaching the preset sealing position, and cannot perform sealing at the preset sealing position, and its function is relatively single. Cascading layers are prone to occur, and when obstacles are encountered during the downhole process, they are easily damaged by collisions and lack protection. Therefore, it does not meet the existing needs

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