A waterproof device for gaps between bimetallic composite pipe liquid-expanded base liner pipes

Abstract

The invention provides a gap waterproof device for the base liner formed by liquid expansion of bimetallic composite pipe, which comprises a base tube and a liner located in the base tube and coaxial with the base tube. The sealing pressure ring on the liner is provided with a waterproof sealing ring sleeved on the liner between the sealing pressure ring and the liner; the sealing pressure ring is provided with a first through hole in the radial direction, and a useful The exhaust valve is used to discharge the air between the inner wall of the base pipe and the outer wall of the liner. The liquid-expanded base liner gap waterproof device provided by the invention can not only facilitate the air discharge between the base liner tubes, but also prevent water from entering between the base liner tubes, and can ensure that the liner tubes can be installed in the axial direction The free expansion and contraction optimizes the waterproofing process of the bimetal composite pipe liquid expansion forming, which greatly improves the forming quality of the composite pipe while reducing the manufacturing cost. The mechanism of the device has the advantages of simple structure, convenient installation, high reliability and low cost.

Description

technical field [0001] The invention relates to a bimetallic composite pipe, in particular to a gap waterproof device for a bimetallic composite pipe liquid expansion forming base liner pipe. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for energy is increasing. In order to meet market needs, the exploitation of oil and gas fields is gradually developing in the direction of high corrosion environments such as deep wells, oceans, and remote lands. Therefore, it is necessary to develop high-quality high-acid resistant pipes. The bimetallic composite pipe is composed of two metal pipes of different materials: the base pipe is a high-strength carbon steel pipe, the inner lining is a corrosion-resistant alloy, and the pipe layers are tightly bonded through various deformation and connection techniques. With good strength and corrosion resistance, and low cost, it has been widely recognized by domestic and foreign ma...

AI Technical Summary

Problems solved by technology

At present, in order to prevent the problem of water ingress into the base liner, the traditional process is to weld the base pipe and the end of the liner, but in order to completely discharge the air between the base liner and the base pipe, it is necessary to drill holes at the end of the base pipe and use a special The equipment is vacuumed. The forming process is complex and limits the free deformation of the liner. In addition, after the composite pipe is formed, the hole at the end needs to be cut off, which increases the manufacturing cost.

Images