Abstract: Coiled tubing is a tubular product for oil and gas, which can be curled repeatedly and coiled around a reel with a length of several kilometers. As compared to conventional tubing, coiled tubing has some unique advantages, such as convenient transportation and high efficiency, and is extensively used for various no-killing operations such as acidizing, fracturing and sand washing. It is called as “universal tubing.” Based on the service environment for coiled tubing and taking into account weldability, anti-buckling performance, anti-fatigue performance and corrosion resistance of coiled tubing, CNPC Baoji Petroleum Steel Pipe Company Limited has designed and developed new-type coiled tubing using low-carbon micro-alloy heat-rolled steel band. It has created a set of coiled tubing technology with its independent intellectual property right, including steel strip docking, transformation heat treatment of inclined welding seams, high-stability and high-precision HFW shaping welding, heat treatment of whole tube body and heat treatment of welding. It has also established the first coiled tubing production line in Asia and developed CT80 coiled tubing (the yield strength ≥ 552 MPa and the tensile strength ≥ 621 MPa).The assessment result and field application indicated that all the indexes of the product, such as strength, plasticity, corrosion resistance and service life, reached the advanced international level.

Key words: CT80 steel grade, coiled tubing, China-made

摘要： 连续管是一种单根长度可达数千米、可反复弯曲、盘绕在卷筒上交付使用的油气管材,和传统的油气管材相比具有运输方便、效率高的独特优势,广泛应用于酸化、压裂、冲砂等多种不压井作业之中,被称为"万能管"。中国石油宝鸡石油钢管有限责任公司根据连续管服役环境,综合考虑焊接性能、抗折弯性能、疲劳性能及耐腐蚀性能,设计开发了连续管用低碳微合金钢热轧钢带,在此基础上形成了钢带对接、斜焊缝形变热处理、高稳定高精密HFW成型焊接、全管体热处理、焊缝热处理等一套具有完全自主知识产权的连续管制造技术,建成了亚洲首条连续管生产线,研制出了CT80钢级(屈服强度≥552MPa、抗拉强度≥621MPa)国产连续管。经检测评价和现场使用,产品的强度、塑性、耐蚀性、服役寿命等各项指标均达到国际先进水平。

关键词: CT80钢级, 连续油气管, 国产