A kind of zirconium alloy flexible coiled tube and its manufacturing method

Abstract

The invention discloses a zirconium alloy flexible continuous pipe and a manufacturing method thereof. The mass percentage of each component in the zirconium alloy flexible continuous pipe is: Zr+Hf≥95.5; Hf:≤4.5; Nb: 2.2~2.8; Fe: 0.10~ 0.13; Si: 0.007-0.01; Cr: 0.04-0.07; H: ≤0.005; N: ≤0.025; C: ≤0.05; O: ≤0.18. Through the alloy composition design, the short zirconium strips are connected to a specified number of meters, and after roll forming, high-frequency resistance welding, heat treatment, winding and other processes, a zirconium alloy flexible continuous tube with a length of more than 61 meters is made, which solves the existing problem Coiled tubes such as carbon steel and stainless steel have insufficient corrosion resistance, etc., and have high plasticity and excellent corrosion resistance, forming a zirconium alloy coiled tube manufacturing process technology, which is mainly used for petroleum, chemical, nuclear energy transmission and injection Etc heavy corrosion pipeline field.

Description

Technical field: [0001] The invention belongs to the technical fields of petroleum, chemical and nuclear power pipes, and relates to a coiled tube, in particular to a zirconium alloy flexible coiled tube and a manufacturing method. Background technique: [0002] Flexible coiled tubing can be used in oil and gas field workover, logging, drilling and other fields. Coiled tubing operation sometimes reaches thousands of meters, and it needs to bear repeated tension, compression, twisting, bending, extrusion, grinding and other compound loads under high internal pressure. Coiled tubing operation has high efficiency, low operation cost and wide operation range , small footprint and a series of advantages. [0003] Zirconium is a new corrosion-resistant metal material that has emerged in recent years, and has excellent acid and alkali corrosion resistance. However, zirconium is a chemically very active element. It reacts with oxygen at 200°C, reacts with hydrogen at 300°C, and re...

AI Technical Summary

Problems solved by technology

There is no precedent for the use of zirconium alloys in the production of coiled tubes in the prior art. On the one hand, it is relatively expensive to prepare coiled tubes from zirconium alloys, and on the other hand, it is the limitation of the manufacturing process.

[0005] However, with the increasingly severe corrosion conditions of conventional oil and gas reservoirs and the rapid development of chemical industry and nuclear energy, flexible continuous zirconium tubes can be used for workover and logging in oil and gas fields, injection of strong chemical additives in industry, and highly acidic acetic acid, In the field of acetic anhydride transportation and other fields, there are many traditional fixed-length zirconium pipe joints, and the joints are prone to failure and damage earlier than the pipe body, which increases the risk of operation