CT130Q调质型连续管性能分析及应用  

Performance Analysis and Application of CT130Q Quenched and Tempered Coiled Tubing

作　　者：赵坤 李兴华 赵海涛 赵建龙 刘海璋 王华[1,2] ZHAO Kun;LI Xinghua;ZHAO Haitao;ZHAO Jianlong;LIU Haizhang;WANG Hua(CNPC Baoji Petroleum Pipe Industry Co.,Ltd.,Baoji 721008,Shaanxi,China;Baoji Petroleum Coiled Tubing Company of BSG Group,Baoji 721008,Shaanxi,China)

机构地区：[1]中国石油集团宝石管业有限公司,陕西宝鸡721008 [2]宝石管业连续油管公司,陕西宝鸡721008

出　　处：《焊管》2024年第12期75-81,共7页Welded Pipe and Tube

摘　　要：为解决深井、超深井及大位移水平井中拖动压裂、钻磨桥塞等技术难题,改善CT130高钢级连续管的抗内压、抗外压、疲劳寿命、塑性等综合性能,通过调质热处理研制开发了CT130Q钢级Φ50.8 mm×4.44 mm规格连续管。检测结果表明,CT130Q调质连续管屈服强度为948 MPa,抗拉强度为1056 MPa,伸长率为21.5%,硬度小于31HRC,金相组织以回火索氏体为主,晶粒度为12.5级,与常规CT130连续管相比组织均匀、晶粒更细,各项性能指标均满足标准要求;同时,具有较高的抗内压(191.7 MPa)、外压(168.0 MPa)能力,较常规CT130连续管有较大提升,弯曲疲劳寿命(309次)与常规CT130连续管(230次)相比提高了34%。与同规格常规CT130连续管相比,CT130Q连续管力学性能稳定,屈强比更低,塑性、韧性更好,能够承受井下较大的冲击和形变。在四川页岩气某区块下井作业,最大疲劳度为23.81%,同等作业工况下,疲劳寿命提高了10%~15%,作业效率和作业安全性均得到较大提高。In order to solve the technical problems of drag fracturing,drilling and grinding bridge plug in deep wells,ultra⁃deep wells and extended reach horizontal wells,and improve the comprehensive performance of internal pressure resistance,external pressure resistance,fatigue life and plasticity of CT130 coiled tubing,CT130Q gradeΦ50.8 mm×4.44 mm coiled tubing was developed by tempering and heat treatment.The test results show that the yield trength of CT130Q coiled tubing is 948 MPa,the tensile strength is 1056 MPa,the elongation is 21.5%,the hardness is less than 31HRC,the metallograph is mainly tempered sortenite,the grain size is 12.5,and the microstructure is uniform and the grain size is finer than that of conventional CT130 coiled tubing.All performance indicators meet the standard requirements.It has higher resistance to internal pressure(191.7 MPa)and external pressure(168.0 MPa),which is greatly improved compared with the conventional CT130 coiled tubing,and the bending fatigue life(309 times)is increased by 40%compared with the conventional CT130 coiled tubing(230 times).Compared with conventional CT130 coiled tubing of the same specification,CT130Q coiled tubing has stable mechanical properties,lower yield ratio,better plasticity and toughness,and can withstand greater impact and deformation in the well.In the well operation of a shale gas block in Sichuan province,the maximum fatigue is 23.81%,and the fatigue life is increased by 10%~15%under the same working conditions,and the working efficiency and safety are greatly improved.

关 键 词：CT130Q 调质型连续管 金相组织 力学性能 疲劳寿命 

分 类 号：TG115[金属学及工艺—物理冶金] TE931.2[金属学及工艺—金属学]