Wash pipe assembly with double-seal structure, wash pipe device, lubricating system and lubricating process

Abstract

The invention relates to a wash pipe assembly with a double-seal structure, a wash pipe device, a lubricating system and a lubricating process. The wash pipe assembly is characterized in that an upperwash pipe and a lower wash pipe are hermetically connected through a sealing component to form a slurry passage inside the upper wash pipe and the lower wash pipe; a fixing component sleeves the peripheries of the sealing component and the upper wash pipe, the upper end of the fixing component is hermetically connected with the upper wash pipe, and the lower end of the fixing component is hermetically connected with the sealing component so as to form a lubricating oil cavity among the upper wash pipe, the sealing component, the lower wash pipe and the fixing component; a first sealing face and a second sealing face are arranged on the sealing component, the first sealing face is used for isolating the slurry channel from the lubricating oil cavity, and the second sealing face is used forisolating the lubricating oil cavity from ambient air; and the lubricating oil cavity is used for being filled with an oil liquid. On one hand, the oil liquid provides lubrication for a rotating partinside the wash pipe assembly; on the other hand, the pressure in the lubricating oil cavity is larger than or equal to the slurry pressure in the slurry channel, so that slurry is prevented from leaking outwards; and the problem that the slurry leakage amount is large, a wash pipe device cannot idle for a long time, and maintenance is inconvenient due to a single-seal mode is solved.

Description

technical field [0001] The invention relates to the technical field of sealing of a pipe flushing device for oil and gas drilling, in particular to a pipe flushing assembly with a double-seal structure, a pipe flushing device, a lubrication system and a lubrication process. Background technique [0002] The pipe flushing device is one of the important components of the oil and gas drilling top drive. It is used to connect the gooseneck and the center pipe that rotates relative to the gooseneck, and transport the high-pressure mud output by the drilling pump to the downhole drill bit. With the extension of drilling well depth and horizontal section, and the increasing requirements of drilling speed and efficiency, the pump pressure of mud and the speed of center pipe are constantly increasing. Long service life, gradually replacing the traditional packing seal flushing device at this stage. [0003] The existing mechanical seal flushing device adopts the form of a single sea...

AI Technical Summary

Problems solved by technology

[0005] The present invention relates to a pipe flushing assembly with a double seal structure, a pipe flushing device, a lubrication system and a lubrication process thereof, which solves the problem of the single seal of the pipe flushing assembly in the prior art. The large amount of mud leakage caused by the structure is not easy to maintain

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