Setting and unsealing mechanism for underground sealing short section

Abstract

The invention provides a setting and unsealing mechanism for an underground sealing short section. The setting and unsealing mechanism comprises a piston cylinder, wherein a piston rod is arranged inthe piston cylinder; the bottom of the piston rod is connected with the top end of a push rod; a sleeve, a spring, an inner taper sleeve, a screw ring, a thrust ring, a pressing sleeve, a rubber cylinder and a guide cone are sequentially sleeved on the outer side of the piston cylinder from top to bottom; an air cavity is formed between the piston cylinder and the sleeve; a plurality of circular holes are formed in the wall of the piston cylinder; steel balls are arranged in the circular holes; the inner sides of the steel balls are pressed on the push rod; the outer sides of the steel balls are clung to the inner taper sleeve; the upper end of the thrust ring is integrally connected with the lower end of the push rod through a bolt; the pressing sleeve is arranged on the outer side of thethrust ring; the rubber cylinder is arranged between the pressing sleeve and the guide cone at the bottom of the piston cylinder; the rubber cylinder communicates with the outside through a pressureguide hole; and the upper part of the rubber cylinder communicates with the outside through a pressure relief valve and a pressure relief hole; the inner taper sleeve, the push rod and the steel ballsform a double-conical-surface self-locking structure, so that the locking is more reliable, the borne reverse thrust is larger, and the locking cannot be invalid unless a part is damaged. The settingand unsealing mechanism has the advantages of reasonable structure, convenience in operation, safety and reliability in setting, high efficiency and practicability.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a setting and unsealing mechanism that can be used for downhole sealing pup joints. Background technique [0002] Downhole sealing nipples are often used in processes such as layered water injection, recovery pressure testing, seal inspection, and profile control. Blockage, separate the tubing string to facilitate subsequent testing or construction. [0003] The traditional sealing section is mainly driven by gravity impact, motor or hydraulic pressure; the gravity impact and motor driving force are small, and it is only suitable for self-sealing expansion rubber cartridges, which withstand small pressure differences and can only withstand one-way sealing; in addition, gravity impact There is no position locking mechanism, and the rubber cartridge has the risk of retreating; while the motor drive relies on the self-locking of the lead screw to prevent the r...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned problems in the prior art, the purpose of the present invention is to provide a setting and unsealing mechanism that can be used for downhole sealing pup joints, which can solve the problem of hydraulic drive The sealing nipple has the advantages of large unsealing force and difficult reset, and has the advantages of reasonable structure, convenient operation, reliable setting and sealing, high efficiency and practicality

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