316L不锈钢连续油管在塔里木油田应用的适用性研究

Study on the Applicability of 316L Stainless Steel Coiled Tubing in the Tarim Oilfield

近些年来,随着材料技术和制管技术的不断发展,连续油管的制造质量不断提高,选用材料更加多元化。为了给油气田连续油管作业选材提供依据,考虑油田抗腐蚀性和经济安全性要求,对316L奥氏体不锈钢开展材料性能系统检测,并模拟油气井钻完井、酸化、生产阶段井下高温腐蚀作业环境,开展高温高压腐蚀试验研究,对该材质在油田应用的适用性进行探讨。结果表明:该3种工况下316L不锈钢虽具有优异耐蚀性,但其应力开裂敏感性较高,同时受屈服强度的限制,不适合在超深井中的该3种工况下应用。

In recent years,with the continuous advancement of material technology and pipe manufacturing techniques,the quality of coiled tubing production has significantly improved,and the selection of materials has become increasingly diverse.In order to provide a basis for material selection in coiled tubing operations in oil and gas fields,systematic material performance tests were conducted on 316L austenitic stainless steel,taking into account the requirements for corrosion resistance,economic feasibility and safety in oilfield applications.The high-temperature corrosion operation environment during the drilling,completion,acidification and production stages of oil and gas wells was simulated,and high-temperature and high-pressure corrosion test research was conducted.The applicability of 316L stainless steel in oilfield operations was investigated under these conditions.Results showed that although 316L stainless steel exhibited excellent corrosion resistance under the three simulated conditions,it showed high sensitivity to stress corrosion cracking.Furthermore,due to the limitations of its yield strength,it was deemed unsuitable for use in ultra-deep wells under these three working conditions.