Self-tightening sealing structure of gas well mouth visualization device

Abstract

The invention belongs to the technical field of hydraulic sealing, and discloses a self-tightening sealing structure of a gas well mouth visualization device, which comprises a shell, a fixed sealing ring mounted in the shell and a floating sealing seat slidably mounted on the fixed sealing ring, and a conical counter bore is formed in the end face, facing the inner space of the shell, of the floating sealing seat. Pressure-bearing glass is installed in the conical counter bore and abuts against the fixed sealing ring. A sealing cover base is installed on the shell and abuts against the end, away from the inner space of the shell, of the floating sealing base, a balance cavity formed by a gap is formed between the end, facing the inner space of the shell, of the sealing cover base and the floating sealing base, and the balance cavity communicates with the inner space of the shell. The self-tightening sealing structure has the advantages of being long in service life and reliable in sealing performance, and the problems that an existing sealing structure is short in sealing life, and variable sealing elements need to be replaced frequently are solved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic sealing, and in particular relates to a self-tightening sealing structure of a gas well head visualization device. Background technique [0002] As visualization technology is more and more applied to the detection of tubing couplings in snubbing operations, due to the existence of tubing couplings, it is necessary to frequently open and close the upper and lower ram BOPs alternately to allow the couplings to pass through. The annular pressure between the ram BOPs is also constantly changing (when the lower ram BOP is opened, the upper ram BOP is closed, and the annular pressure is the downhole pressure, up to 20MPa; the lower ram BOP When closed, the upper ram blowout preventer opens, and the annular pressure is the surface atmospheric pressure), in such an environment with a huge pressure difference and frequent pressure changes, high requirements are placed on the sealing of the visualization...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the main method for sealing the pressure-bearing glass is to set an O-ring or a rubber gasket between the pressure ring and the pressure-bearing glass, and the pressure is fixed by bolts. The ring and the pressure-bearing glass are compressed. Due to the high sealing pressure, a large bolt pre-tightening force is required to compress the sealing structure, and the sealing element is in a high-pressure squeezed state for a long time, which will cause the sealing element to age rapidly and lose the sealing effect. The sealing life of the sealing method is short. Once the sealing components are not replaced in time, the water, air and other media in the annulus will leak into the visualization device, and the electronic components will be exposed to high-voltage environments and deform, resulting in circuit instability. Batteries, When the circuit board encounters water, it is easy to short-circuit or even burn the electronic components, resulting in the destruction of the entire visualization device

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