Inward clamping device for clamping composite oil pipe lining

Abstract

The invention discloses an inward clamping device for a composite oil pipe. The inward clamping device is suitable for clamping a composite oil pipe lining and comprises a main body, a pushing piston, a sealing ring I, fastening blocks, a lubricating hole, a sliding sealing piston rod, a spring, a sealing ring II and a guide head. The pushing piston is installed in the main body in a sliding sealing and sleeved mode. Four bevel grooves are formed in the outer wall of the pushing piston in the circumferential direction. Four radial windows are formed in the position, opposite to the bevel grooves of the pushing piston, of the wall of the main body, and each radial window is internally provided with one fastening block. The slope of the inner side bevel of each fastening block is identical to that of each bevel groove in the pushing piston, and therefore the fastening blocks and the pushing piston can slide relatively in a matched mode. High-pressure liquid acts on an upper seat of the pushing piston, the pushing piston is pushed to move downwards, the fastening blocks are forced to slide outwards to clamp the composite oil pipe inwards, the composite oil pipe can be repaired conveniently, pressure is relieved after repair is completed, and the spring pushes the piston rod to return to the original position.

Description

technical field [0001] The invention relates to a repairing process for composite oil pipes (that is, composite oil pipes) in the petroleum industry, in particular to an internal tightener for repairing composite oil pipes and a repairing process thereof, which is suitable for repairing composite oil pipes, simplifies the repairing process, and reduces processing costs. Background technique [0002] Polyethylene composite oil pipe is made of ultra-high molecular weight polyethylene pipe lined into ordinary oil pipe through a certain process, and processed into composite oil pipe. The product has excellent properties such as extremely high wear resistance, corrosion resistance, temperature resistance, impact resistance, aging resistance, self-lubricating property, self-repairing property, non-stickiness, and high pressure resistance. It is especially suitable for eccentric wear wells, Seriously corroded oil and water wells, therefore, in recent years, more and more oil compan...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an inner tightener for composite oil pipe repair and its repair process, to solve the problem that the thread damage and flanging damage of such composite oil pipes use the existing drag lining repair method to cost a lot of money, use the inner tightener to fix the composite oil pipe, cooperate Thread processing and other processes simplify the repair process and reduce processing costs

Images