Backwashable and multi-setting packer

Abstract

The invention relates to a backwashing well and multiple setting packer which is used for the field of extraction of petroleum and natural gas, and mainly solves the problems that an existing packer is poor in sealing ageing and does not have a backwashing function, and continuous and multiple setting cannot be achieved. The packer comprises an upper connector, a reverse circulation valve outer cylinder, a spring, a center pipe a, a piston, a rubber cylinder shaft, a rubber cylinder a, a rubber cylinder spacer ring, a rubber cylinder b, a rubber cylinder protection ring, a rubber cylinder limit sleeve, a sleeve a, a center pipe b, a sleeve b, a sealing ring a, a sealing ring b and a lower connector, the sealing ring a is mounted on the sleeve a, the sealing ring b is mounted on the sleevea and the center pipe b, the sleeve b is connected with the sleeve a in a threaded manner, and the lower connector is connected with the center pipe b in a threaded manner. The packer is simple in structure and complete in function and has a backwashing well function, multiple setting can be achieved, and failure or potential safety hazard of the packer caused by multiple setting cannot be generated.

Description

technical field [0001] The invention relates to a packer used in the field of oil and natural gas exploitation, which can backwash the well and can be set several times. Background technique [0002] At present, most domestic oil fields have entered the middle and late stage of production and development, the development cycle is gradually extended, the oil wells developed are gradually deepened, the downhole temperature is getting higher and higher, the pressure difference between oil layers is gradually increasing, and the downhole environment is becoming more and more complex. The material and sealing performance of the packer have been subjected to a great test. However, the existing packers have poor sealing timeliness, insufficient pressure resistance and temperature resistance, and there is no backwashing device. In order to prevent halfway setting before setting, pins are needed to fix them, and pipe strings are used for setting. The setting pin will be sheared by i...

AI Technical Summary

Problems solved by technology

However, the existing packers have poor sealing timeliness, insufficient pressure resistance and temperature resistance, and there is no backwashing device. In order to prevent halfway setting before setting, pins are needed to fix them, and pipe strings are used for setting. The setting pin is sheared by its own gravity and hydraulic pressure, but this design is irreversible

Some packers can be set multiple times, but there are also operational hazards

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