焊管2024，Vol.47Issue(8)：19-23,29,6.DOI:10.19291/j.cnki.1001-3938.2024.08.003
深层页岩气用高强度套管强韧性研究
Study on Strength and Toughness of High Strength Casing for Deep Shale Gas
摘要
Abstract
In order to meet the strength and toughness requirements of high-strength casing for shale gas development at a depth of 3500 m below ground level,the evolution of strength and toughness,microstructure and fracture mechanism of the test casing steel under different heat treatment processes were experimentally studied.The results show that the yield strength of over 1000 MPa and the transverse impact energy of more than 80 J at-10℃ by the optimal heat treatment parameters with quenching at 920℃ and holding for 45 min and tempering at 660℃ and holding for 60 min to 90 min were obtained to show the match of high strength with good toughness and to meet the requirements of T/CPSI 01301-2022 standard for 140V steel grades.With the increase of tempering temperature and the extension of tempering time,the difference of strength and toughness for the test steel was due to the evolution of spheroidization,aggregation and coarsening for precipitated carbides such as in grain boundaries,lath and lath boundaries and the change of fracture morphology characteristics into quasi-cleavage,tear ridge and secondary crack,and then into many dimples and a small number of secondary crack.关键词
高强度套管/淬火工艺/回火温度/回火时间/强韧性匹配Key words
high strength casing/quenching process/tempering temperature/tempering time/strength and toughness matching分类
能源科技引用本文复制引用
何石磊,许建国,王崇沣,陈浩明,侯永利,李远征,包志刚,杨晓龙..深层页岩气用高强度套管强韧性研究[J].焊管,2024,47(8):19-23,29,6.基金项目
中国石油天然气集团有限公司科学研究与技术开发项目"提高页岩气井抗套损能力的新型套管研发"(项目编号2020B—4020). （项目编号2020B—4020）
