Effect of residual stress on ACFM crack measurements in drill collar threaded connections
Effect of residual stress on ACFM crack measurements in drill collar threaded connections
复制标题
DOI：
10.1016/j.ndteint.2003.03.001
复制
发表时间：
2004-07-01
影响因子：
4.2
通讯作者：
Dover, WD
中科院分区：
文献类型：
--
作者：
Knight, MJ;Brennan, FP;Dover, WD
油气勘探中使用的钻铤螺纹连接类型是钻柱的关键部件，其极易受到疲劳损坏的影响。为了减少代价高昂的井下故障，对连接件进行冷轧以引入压缩残余应力，并且在使用时对连接件进行常规检查。交流电场测量（ACFM）技术是一种越来越流行的螺纹检测方法，然而，结果表明，ACFM缺陷尺寸的能力可能会受到影响，当它被用来检查最近的冷轧连接。如果一个连接是冷轧的，而不是首先是无缺陷的，随后的检查可能会根据标准解释低估裂纹深度。因此，轧制前的检查是必要的。(C)2004爱思唯尔有限公司版权所有。
The drill collar threaded connection of the type used in hydrocarbon exploration is a critical component of the drillstring that is highly susceptible to fatigue damage. In an attempt to reduce costly downhole failures the connections are cold rolled to introduce compressive residual stress, and when in service the connections are routinely inspected. The Alternating Current Field Measurement (ACFM) technique is an increasingly popular method of thread inspection, however, results have indicated that the ACFM defect sizing capability may be compromised when it is used to inspect recently cold rolled connections. If a connection is cold rolled without first being defect free, subsequent inspections may under estimate crack depth with the standard interpretation. Inspection before rolling is therefore necessary. (C) 2004 Elsevier Ltd. All rights reserved..