Concentric production pressure transmission device

Abstract

The invention provides a concentric production pressure transmission device, which includes a main body, and an inner cavity is opened in the main body along the axial direction. The upper end of the inner cavity is open, and the lower end is closed. The pressure transmission channel is provided with a packing assembly in the inner chamber, and the packing assembly and the side wall of the inner chamber can be separated and connected together. The inner chamber is divided into an upper pressure holding chamber and a lower pressure releasing chamber by the packing assembly. By controlling the pressure of the pressure-holding chamber, the sealing assembly is driven to separate from the side wall of the inner chamber, and a liquid inlet hole runs through the side wall of the pressure relief chamber along its radial direction, and the liquid inlet hole and the pressure transmission channel are not connected to each other. In the concentric production pressure transmission device of the present invention, the steel ball is pressed against the sliding sleeve by the pre-tightening force of the spring, which ensures sufficient sealing with the steel ball sliding sleeve during pressure transmission. Since the inner cavity of the main body is the main liquid inlet channel, During the production process, the water shutoff switch will not be blocked due to sand production or dirty wells.

Description

technical field [0001] The invention relates to a production pressure transmission device, in particular to a concentric production pressure transmission device for oil exploitation. Background technique [0002] In the production process of small interlayer and high water-cut oil layer in the heavy oil block of the oil field, the water shutoff pipe string above and below the seal is used to realize the water shutoff and production functions. Most of the columns adopt the hands-off string, and the pipe string structure from bottom to top is composed of plug + K341 long rubber cartridge packer + lateral check valve + hands-off packer, and the upper part is exploited by tubular pump. The key component of the string is the lateral check valve, which can transmit the pressure to the lower packer to ensure the setting requirements of the K341 long rubber cartridge packer, so that the packer can meet the requirements of heavy oil inflow after setting. need. [0003] Such as fig...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a concentric production pressure transmission device to solve the problems in the prior art that the ball seat and the ball are not tightly sealed and the check valve is easily blocked during the mining process.

Images