复合模式下套管磨损形状与深度计算模型

doi:10.7623/syxb202110011

石油学报 ›› 2021, Vol. 42 ›› Issue (10): 1373-1381.DOI: 10.7623/syxb202110011

复合模式下套管磨损形状与深度计算模型

黄文君¹, 张星坤¹, 高德利¹, 石小磊¹, 苏鹏²

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. 中国石油化工股份有限公司西北油田分公司新疆乌鲁木齐 830011

收稿日期:2021-01-25 修回日期:2021-06-09 出版日期:2021-10-25 发布日期:2021-11-03
作者简介:黄文君,男,1986年11月生,2009年获中国石油大学(华东)石油工程专业学士学位,2016年获中国石油大学(北京)油气井工程专业博士学位,现为中国石油大学(北京)副教授,主要从事油气井管柱力学与应用方面的研究。Email:huangwenjun1986@126.com
基金资助:
国家自然科学基金创新研究群体项目"复杂油气井钻井与完井基础研究"（No.51821092）、国家自然科学基金石油化工联合基金项目"页岩和致密油气田高效开发建井基础研究"（No.U1762214）、国家自然科学基金青年科学基金项目"旋转钻柱动力屈曲临界条件与后屈曲蛇形摆动和螺旋涡动行为研究"（No.51904317）和中国石油大学（北京）科研启动基金项目（ZX20180414）资助。

Casing wear shape and depth calculation model in a compound mode

Huang Wenjun¹, Zhang Xingkun¹, Gao Deli¹, Shi Xiaolei¹, Su Peng²

1. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
2. Sinopec Northwest Oil Field Company, Xinjiang Urumqi 830011, China

Received:2021-01-25 Revised:2021-06-09 Online:2021-10-25 Published:2021-11-03

摘要/Abstract

摘要： 随着钻井面临的客观条件更加复杂，套管磨损问题日益突出，对安全高效钻井造成严重威胁。现场实测数据表明，某些井段的套管上存在多个磨损区域，磨损区域呈现复合磨损模式，磨损形状的复杂性超出了常规模型的适用范围。在前人工作基础上，利用套管截面空间离散化和钻井过程时间离散化将复杂问题分解为一系列简单问题的组合；引入套管磨损过程的独立控制变量，建立了磨损深度和形状增量的计算模型，给出了套管磨损问题求解的具体步骤以及磨损系数反演方法；最后将理论模型应用到大位移井中。研究结果表明，套管磨损形状并不是总是单月牙形，而是呈现多月牙重叠、交叉和分离的复合模式。不同磨损模式是由不同原因造成的，重叠的原因是磨损外径变化，交叉的原因是磨损位置小幅度偏移，分离的原因是磨损位置大偏离。造斜段套管截面上存在多个磨损区域且磨损深度最大，套管失效风险也最大，是采取防磨措施的关键井段。安装防磨接头的效果最佳，推荐1个立柱安装1个防磨接头，降低磨损系数次之，调整钻井参数的效果最差。

关键词: 钻井, 套管, 钻柱, 套管磨损, 套管失效

Abstract: As the objective conditions of drilling become more complex, the problem of casing wear turns to be increasingly serious, posing a serious threat to safe and efficient drilling. Field measurement data show that there are multiple wear areas on the casings in certain well sections. These areas present a compound wear pattern, and the complexity of the wear shape exceeds the application scope of conventional models. On the basis of previous work, the authors break complex problems into a combination of a series of simple problems using the spatial discretization of casing profile and the time discretization of drilling process. The calculation models of wear depth and shape increments are established by introducing independent control variables for the casing wear process, specific steps are given to solve the problem of casing wear and the inversion method of wear coefficients is also provided. Finally, the theoretical model has been applied to an extended reach well. The results show that the wear area of the casing is not always in the shape of a crescent moon, presenting a composite pattern of multiple crescents overlapping, crisscrossing and separating. Different wear modes are caused by different reasons. The reason for the overlapping pattern is the change in the outer diameter due to wear, the reason for the crisscrossing pattern is the small deviation of the wear position, and the reason for the separating pattern is the large deviation of the wear position. There are multiple wear areas on the casing profile of the kickoff section, and the wear depth is the greatest, and the risk of casing failure is also the largest. It is a key well section where anti-wear measures are taken. The way of installing blast joints has the best effect, and it is recommended that one stand should be installed with one blast joint; that of reducing the wear coefficient has good effect; that of adjusting the drilling parameters has the worst effect.

Key words: drilling, casing, drill string, casing wear, casing failure

中图分类号:

TE28

黄文君, 张星坤, 高德利, 石小磊, 苏鹏. 复合模式下套管磨损形状与深度计算模型[J]. 石油学报, 2021, 42(10): 1373-1381.

Huang Wenjun, Zhang Xingkun, Gao Deli, Shi Xiaolei, Su Peng. Casing wear shape and depth calculation model in a compound mode[J]. Acta Petrolei Sinica, 2021, 42(10): 1373-1381.

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复合模式下套管磨损形状与深度计算模型

Casing wear shape and depth calculation model in a compound mode

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