Pipe flushing assembly with double seal structure, pipe flushing device, lubrication system and lubrication process

Abstract

The invention relates to a flushing pipe assembly with a double-seal structure, a flushing device, a lubricating system and a process thereof. The upper flushing pipe and the lower flushing pipe are sealed and connected by a sealing member to form a mud passage inside the flushing pipe. The fixing member is sleeved on the outer periphery of the sealing member and the upper punching tube, the upper end is sealed to the upper punching tube, and the lower end is sealed to the sealing member to form a lubricating oil chamber between the upper punching tube, the sealing member, the lower punching tube and the fixing member. The sealing member is provided with a first sealing surface and a second sealing surface, the first sealing surface is used for isolating the mud channel and the lubricating oil chamber, and the second sealing surface is used for isolating the lubricating oil chamber and ambient air. The lubricating oil chamber is used for filling oil. On the one hand, the oil provides lubrication for the rotating parts in the flush tube assembly. On the other hand, the pressure in the lubricating oil chamber is greater than or equal to the mud pressure in the mud passage, so as to avoid the mud from leaking outwards. It solves the problems that the large amount of mud leakage caused by the single-sealing form, the flushing device cannot be idling for a long time, and it is not easy to maintain.

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

Images