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

作　　者：何石磊 许建国[2] 王崇沣 陈浩明 侯永利 李远征[1,2] 包志刚 杨晓龙[1,2] HE Shilei;XU Jianguo;WANG Chongfeng;CHEN Haoming;HOU Yongli;LI Yuanzheng;BAO Zhigang;YANG Xiaolong(Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods Co.,Ltd.,Xi'an 710018,China;CNPC Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Fengcheng Oilfield Operation Area,CNPC Xinjiang Oilfield Branch,Karamay 834000,Xinjiang,China)

机构地区：[1]中油国家石油天然气管材工程技术研究中心有限公司,西安710018 [2]中国石油宝鸡石油钢管有限责任公司,陕西宝鸡721008 [3]中国石油天然气股份有限公司新疆油田分公司风城作业区,新疆克拉玛依834000

出　　处：《焊管》2024年第8期19-23,29,共6页Welded Pipe and Tube

基　　金：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)。

摘　　要：为满足井深大于3 500 m的页岩气开发用高强度套管的强韧性要求,对试验用套管钢在不同热处理条件下的强韧性变化、显微组织演变及微观断裂机制等进行试验研究。试验结果表明:该试验钢的最佳热处理工艺条件为920℃保温45 min后淬火,660℃保温60~90 min后回火,其屈服强度≥1 000 MPa、-10℃横向冲击功≥80 J,可满足T/CPSI 01301—2022标准对140钢级的要求,具有最佳的强韧性匹配。随着回火温度升高及回火保温时间延长,晶界、板条内及板条界等位置上析出碳化物发生球化、聚集及粗化演变,断口形貌特征逐渐转变为准解理、撕裂棱及二次裂纹,进而演变成大小韧窝和少量二次裂纹特征,造成了试验钢的强韧性差异。In order to meet the strength and toughness requirements of high-strength casing for shale gas development at a depth of 3 500 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 1 000 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 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]