API套管抗内压标准解析  

Analysis on Casing Capability Resisting to Internal Pressure in API Specification

作　　者：滕学清[1] 朱金智[1] 吕拴录[1,2] 文志明[1] 秦宏德[1] 董仁[1] 王晓亮[1] 马琰[1] 徐永康[1] 石桂军 TENG Xueqing ZHU Jinzhi LYU Shuanlu WEN Zhiming QING Hongde DONG Ren WANG Xiaoliang MA Yan XU Yongkang SHI Guijun(Tarim Oil Field, Kuerle,Xinjiang 841000,China Material Science and Engineering Department of China University of Petroleum, Beijing 102249, China)

机构地区：[1]塔里木油田公司,新疆库尔勒841000 [2]中国石油大学材料科学与工程系,北京1022491

出　　处：《石油管材与仪器》2016年第5期96-100,共5页Petroleum Tubular Goods & Instruments

摘　　要：对某油田在套管设计中的套管内屈服压力理解方面遇到的问题进行了调查研究,对API关于套管水压试验压力、套管内屈服压力和套管内压性能试验等标准规定进行了解析,认为API规定的水压试验主要是检查套管管体是否渗漏,并非检查套管接头密封性能。对套管内压至失效试验结果进行了分析,认为各项参数符合API标准的套管内屈服压力远远高于API TR 5C3规定值,油田应当按照API TR 5C3规定的内屈服压力进行套管柱设计,而不是按照静水压试验压力进行套管柱设计。通过对API TR5C3规定的套管内屈服压力计算公式进行解析,对套管接箍失效事故进行调查研究,认为对套管接箍外壁进行机械加工有利于防止深井和超深井发生接箍失效事故。建议用户对套管上扣所用螺纹脂、水压试验压力和稳压时间、套管内屈服强度等主要性能严格要求。The investigation was done on the problems to understand the casing internal yield pressure. It was considered that the purpose of hydrostatic pressure test specified by API was mainly to inspect whether casing pipe body leaks,instead of to inspect connection seal performance per analyzing casing hydrostatic pressure test,casing internal yield pressure,and internal pressure test specified in API standard.Through casing full size test result analyzing,it was found that the casing internal yield pressure is much higher than that specified by API as long as the various parameters of casing are in accordance with API specification,so the casing string should be designed in accordance with casing internal yield pressure,instead of hydrostatic pressure specified by API. Through investigating casing coupling failure accident,it was deduced that casing coupling failure could be prevent in deep and ultra- deep wells by machine coupling outside surface by means of analyzing the calculation formula of casing internal yield pressure specified in API TR 5C3. It is suggested that the thread compounds,hydrostatic test pressure and hold time,and casing internal yield pressure etc should be required strictly by user.

关 键 词：套管 静水压试验 内屈服压力 接箍 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]