基于钻柱屈曲的大位移井套管磨损预测模型  

Prediction model of casing wear for extended reach wells considering buckling of drill string

作　　者：顾岳[1] 高德利[1] 杨进[1] 黄文君[1] 聂帅帅 GU Yue;GAO Deli;YANG Jin;HUANG Wenjun;NIE Shuaishuai(MOE Key Laboratory of Petroleum Engineering in China University of Petroleum(Beijing),Beijing 102249,China;Department of Petroleum Engineering in Chengde Petroleum College,Chengde 067000,China)

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]承德石油高等专科学校石油工程系,河北承德067000

出　　处：《中国石油大学学报（自然科学版）》2021年第5期73-79,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金创新研究群体项目(51821092);国家自然科学基金重点项目(U1762214);国家科技重大专项(2017ZX05009-003);国家科技重大专项子课题(2017ZX05005-005-007);国家重点研发计划(2018YFB0605502,2016YFC0303303)。

摘　　要：大位移井由于井深长,狗腿度严重,摩阻扭矩大等原因,在钻柱下入过程中,钻柱可能会产生屈曲,这会导致钻柱轴线与井筒轴线不再平行,钻柱进尺长度会显著增加,加剧套管的磨损。在套管磨损预测模型中,引入由于钻柱屈曲而产生的钻柱进尺长度变化量,建立适合于大位移井的套管磨损预测模型。结合采用“井工厂作业”模式下的南海流花某大位移井W1的井径测试数据,对邻井W2进行套管磨损预测。结果表明:忽略钻柱的屈曲效应时,测深2144 m处的套管磨损深度预测值会被低估16.9%;仅考虑由钻柱屈曲所引起的附加载荷和套管截面几何变化,不考虑钻柱进尺长度变化量时,测深2144 m处的套管磨损深度被低估10%;针对大位移井的套管磨损预测,如果忽略由于钻柱屈曲所带来的钻柱进尺长度变化量,会使套管磨损深度预测值被低估。The tubular string is vulnerable for buckling during downhole string loading operation due to many factors,such as long well depth,large dog-leg severity and high drag and torque.Buckling of the drill string can significantly increase its slide and footage,which aggravates casing wear.In this paper,the change of drill string footage due to bucking was coupled into a conventional casing wear prediction model,in which a new case wear model was established appropriating for extended reach wells.Referring to the caliper test data from well W1 in South China Sea,the casing wear prediction of the adjacent well W2 was conducted.The results indicate that,when the buckling of drill string is not considered,the predicted value of the casing wear at depth of 2144 m can be underestimated by 16.9%.When the change of drill string footage caused by buckling is ignored,the predicted value of the casing wear at the same depth can be underestimated by 10%.The new casing wear prediction model presented in this paper can accurately predict the casing wear in extended reach wells.

关 键 词：套管磨损 大位移井 钻柱屈曲 钻柱进尺长度 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]