Novel packer based on ambient pressure

Abstract

The invention discloses a novel packer based on the ambient pressure. A rear hydraulic cylinder, a front hydraulic cylinder and a vacuum oil tank are arranged on a spindle; a vacuum cavity is arranged in the vacuum oil tank; four oil circuits are arranged on the spindle; an oil return cavity of the front hydraulic cylinder is communicated with rodless cavities of the rear hydraulic cylinder through the oil circuits respectively; a rod cavity of the rear hydraulic cylinder is communicated with the vacuum oil tank; the oil return cavity of the front hydraulic cylinder is communicated with the rod cavity of the rear hydraulic cylinder; the rodless cavity of the rear hydraulic cylinder is communicated with the vacuum oil tank; solenoid valves are respectively arranged on the oil circuits; under the condition of starting setting, ambient pressure oil enters an oil inlet cavity of the front hydraulilc cylinder, pressure oil in the oil return cavity of the front hydraulic cylinder enters the rodless cavity of the rear hydraulic cylinder, oil liquid in the rod cavity of the rear hydraulic cylinder returns to the vacuum oil tank, a push rod compresses a rubber sleeve seat under the action of pressure so as to force a rubber sleeve to be stressed to deform, expand and compress a sleeve pipe, and the setting action is finished. The novel packer based on the ambient pressure provided by the invention adopts the ambient pressure under a petroleum well as a drive source, and no extra drive equipment is required, so that the cost is reduced, and the usage is more energy-saving.

Description

technical field [0001] The invention relates to a downhole oil layer protection packer, in particular to a new type of packer which adopts downhole oil well environment pressure as a driving source and combines the environment pressure with hydraulic transmission to realize isolation and delamination. Background technique [0002] Packer is a downhole tool used to control fluid production and protect casing by isolating production layers in oil production engineering. The annular space between the center pipe and the casing is sealed by the force deformation of the rubber tube, so as to achieve the purpose of downhole layered sealing. Due to the current lack of resources, oil production has begun to shift from shallow to deep. The environment of deep wells is harsh and mining is very difficult. During the oil production process, the requirements for setting and unsealing of packers are very strict. and performance requirements are very high. However, most of the existing p...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the existing mechanical packers, such as high cost, extra drive equipment and inability to be used repeatedly in downhole when setting and unsealing, to propose a method that adopts oil downhole environmental pressure As the drive source packer, the packer combines environmental pressure and hydraulic transmission. Its body adopts the form of double hydraulic cylinder drive and vacuum chamber oil return. It only needs to control the solenoid valve on the well to switch between setting and unsealing Action, and then control the movement direction of the hydraulic cylinder to complete the setting and unsealing of the packer, which simplifies the mechanical structure of the packer, realizes that it can drive a large load with a small power on the well and can be used repeatedly, making the equipment more efficient For energy saving and lower maintenance costs

Images