摘要
近年来石油钻探中深井、超深井、大位移水平井越来越多,钻井速度和钻压也大幅提高,增大了钻具的磨损和失效几率,API标准S135钢级钻杆对该类井况及使用均存在较大风险。S钢级高可靠钻杆在钻杆最易失效的3个部位进行了可靠性提升,钻杆材料部分通过优化热处理工艺参数解决了强度与韧性提高的矛盾,研制出在930.825MPa高强度下,管体-20℃冲击功提高109%以上,接头-10℃横向冲击功提高48%以上;管端加厚部分通过采用独有的管端均热技术配合机械式管端加厚工艺,将内过渡带长度达到130mm以上,内过渡带消失处圆弧R≥300mm,有效降低应力集中避免钻杆刺漏;接头部分采用一种新型接头螺纹牙型(BHDX),比同规格API接头抗扭强度提高35%以上。钻杆整体设计寿命比普通API标准S钢级钻杆大幅提高,钻杆的使用可靠性显著提升。
Petroleum drilling has seen more and more deep wells,super-deep wells and horizontal wells with large displacement in recent years.The wear and inefficiency rates of drilling tools are increased owing to significant improvement of drilling rate and drilling pressure.The API-certified drilling rod of S135 steel grade has high risks for such well cases and application.The reliability of highly-reliable drilling rod of S grade is improved at the three positions of the drilling rod that are the easiest to become inefficient.The thermal treatment process parameters are optimized to solve the contradictions in improvement of strength and tenacity so far as some of drilling rod materials is concerned.Impact energy of the developed tube body at-20℃is raised by more than 109 percent under the high strength of 930.825MPa,while horizontal impact energy of joint at-10℃is raised by more than 48 percent.The unique tube-end homogeneously heating technology,matched with mechanical tube-end thickening process,is used to the tube end making the length of inner transitional zone exceed 130mm.R≥300mm at the vanishing point of inner transitional zone,effectively reducing stress concentration to avoid drill rod thorn leakage.A new type of joint thread(BHDX)is adopted for the joint,thus improving torsional strength more than 35 percent as compared to API joint of the same specification.The designed service life of the drilling rod is significantly increased as compared to the ordinary API-certified drilling rod of S steel grade,obviously improving application reliability of the drilling rod.
出处
《石油科技论坛》
2016年第S1期55-57,241,共4页
PETROLEUM SCIENCE AND TECHNOLOGY FORUM
基金
中国石油集团渤海石油装备制造有限公司科技开发项目"高韧性S钢级钻杆研制"
关键词
钻杆
S135钢级
高韧性
冲击功
钻杆螺纹
drilling rod
S135 steel grade
high tenacity
impact energy
drill rod thread
