Bimetal-composite-pipe liquid expansion forming base-pipe and liner-pipe gap waterproof device

Abstract

The invention provides a bimetal-composite-pipe liquid expansion forming base-pipe and liner-pipe gap waterproof device. The bimetal-composite-pipe liquid expansion forming base-pipe and liner-pipe gap waterproof device comprises a base pipe and a liner pipe which is located in the base pipe and is coaxial with the base pipe. Sealing pressing rings arranged on the liner pipe in a sleeving manner are arranged at the two ends of the base pipe respectively. Waterproof sealing rings arranged on the liner pipe in a sleeving manner are arranged between the sealing pressing rings and the liner pipe. First through holes are formed in the sealing pressing rings in the radial direction, and air exhausting valves used for exhausting air between the inner wall of the base pipe and the outer wall of the liner pipe are arranged in the first through holes. By means of the bimetal-composite-pipe liquid expansion forming base-pipe and liner-pipe gap waterproof device, the air between the base pipe and the liner pipe can be easily exhausted, water can be prevented from entering the portion between the base pipe and the liner pipe, it can be guaranteed that the liner pipe can freely stretch out and draw back in the axial direction, the bimetal-composite-pipe liquid expansion forming waterproof technology is optimized, and the forming quality of a composite pipe is greatly improved while the manufacturing cost is reduced. The device has the beneficial effects of being simple in structure, convenient to install, high in reliability and low in 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.

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