Open hole packer for one-time multi-layer cement squeezing and injecting

Abstract

The invention discloses an open hole packer for one-time multi-layer cement squeezing and injecting. The open hole packer comprises an inner supporting assembly (10); the inner supporting assembly comprises an upper center pipe (11) and a lower center pipe (12), and the upper center pipe and the lower center pipe are in threaded connection through a connecting sleeve (13); a pressure transmissionhole (19) is formed in the upper central pipe above the connecting sleeve; external threads are arranged at the top end of the upper center pipe and the top end of the lower center pipe, and jackscrewholes (14) are formed in the external thread sections; back caps (15) are arranged at the jackscrew holes and are locked on the center pipes through jackscrews (18); the top end of the upper center pipe is in threaded connection with an upper joint (16), and a hexagonal head is arranged on the excircle of the upper joint; shear pin grooves (17) are formed in the upper center pipe and the lower center pipe close to the connecting sleeve; and a hydraulic assembly (30) is installed in the shear pin grooves, rubber sleeve assemblies (20) are installed between the hydraulic assembly and the back caps, and the two rubber sleeve assemblies and the hydraulic assembly are symmetrically arranged. The problem that the open hole packer is set in advance in the well descending process can be effectively prevented.

Description

technical field [0001] The invention relates to an open hole packer for one-time multi-layer squeeze cementing, and belongs to the technical field of oil and gas well downhole operation packer tools. Background technique [0002] In view of the current 5 1 / 2"casing dislocation caused by the loss of the lower fracture, drill obliquely from the position of the upper fracture to the target oil layer to connect with the old wellbore, and according to the formation structure through the open hole packer, the open hole can The plugging string formed by the closed sand blaster can realize the effective sealing of the open hole packer with a diameter difference of 25mm in the open hole section, achieving firm and reliable sealing, and the sealing pressure can reach 30Mpa. Complete the complete plugging of new and old wellbore, realize the The purpose of effective scrap management of non-channel wells. [0003] At present, the commonly used double-sealed single-slip segmental squeez...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an open hole packer for one-time multi-layer cementing, so as to effectively prevent the problem of early setting of the open hole packer during the downhole process and solve the problem of incomplete sealing of the setting seal, and prevent the rubber cartridge from being completely sealed. The problem of returning to the position after the pressure is canceled, thereby overcoming the deficiencies of the existing technology

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