高温下套管柱强度设计应考虑的因素分析  

Analysis of Factors to be Considered in Strength Design of Casing String at High Temperature

作　　者：杜聪 张建兵[1] 刘华 罗楚 王海英 Du Cong;Zhang Jianbing;Liu Hua;Luo Chu;Wang Haiying(College of Mechanical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;No.3 Gas Production Plant,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]中国石油长庆油田分公司第三采气厂,陕西西安710018

出　　处：《石油工业技术监督》2022年第1期1-4,共4页Technology Supervision in Petroleum Industry

基　　金：国家自然科学基金“膨胀管金属密封结构扩径变形过程的工作机理研究”(编号:51974251)。

摘　　要：高温环境下的套管柱强度设计对于确保油井的完整性具有关键作用。通过理论分析和试验研究得到了高温下不同钢级套管材料强度的下降规律,不同套管的抗挤、抗内压和抗拉强度变化规律,以及套管柱长度的变化规律、套管柱内部的内应力变化等结果。认识到高温下套管材料的屈服强度和抗拉强度均会降低,且不同钢级材料的强度降低规律不同;还得到了高温下套管柱长度伸长量的计算方法以及套管柱内应力的计算方法,当此应力足够大时会导致井口抬起,或者套管柱发生屈曲。研究结果对于高温井的套管柱设计具有一定的参考价值。The strength design of casing string in high temperature environment plays a key role in ensuring the integrity of oil well.The strength decline law of different steel grade casing materials at high temperature, the varying laws of collapse resistance, internal pressure resistance and tensile strength of different casings and the varying laws of casing string length and internal stress are obtained through theoretical analysis and experimental research. The results show that the yield strength and tensile strength of casing materials will decrease at high temperature, and the strength reduction law of different steel grade materials is different. The calculation method of casing string length elongation at high temperature and the calculation method of casing string internal stress are obtained. When the internal stress of the casing string is large enough, the wellhead will be lifted or the casing string will buckle. The understanding in this paper has a certain reference value for the design of casing string in high temperature wells.

关 键 词：套管柱 屈服强度 高温 屈曲 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]