Through Barrier Diagnostics to Locate Multiple Barrier Failures in Complex Well Failure Scenario and to Enable Successful P&A

M. Volkov, A. Zaripova, Sultan Sikander, Jamal Ezwai, Islam Altaeb, Osama Elbouma
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Abstract

A 60-year-old well exhibited a leak at the surface and sustained annuli pressure (SAP) in all three annuli - A, B and C. The age of the well coupled with the symptoms suggested a complex multi-barrier failure scenario that needed to be diagnosed quickly and accurately so that the well could be secured safely. The paper shows how the comprehensive set of downhole diagnostics, including metal and cement barriers integrity assessment, aided in planning and execution of well intervention to secure the indicated failures. The well intervention team selected an approach to investigate the barriers status prior the rig came to the location. Surface diagnostics included evaluation of pressure trends, completion design, leak fluid composition and drilling records analysis which guided the selection of downhole survey. The input parameters for downhole through barrier diagnostics were: Downhole through barrier diagnostics targeted the evaluation of leak paths and failures in well barriers and included: This paper explores the concept, planning, execution and achieved results of the downhole diagnostics performed and how the results were implemented by Operator.
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通过封隔层诊断,定位复杂井况下的多个封隔层故障,并成功封堵弃井
一口有60年历史的井在地面出现了泄漏,并且在A、B和c三个环空中都存在持续的环空压力(SAP)。井龄和症状表明,这是一个复杂的多屏障失效场景,需要快速准确地诊断,以便安全保护井。本文展示了一套全面的井下诊断,包括金属和水泥屏障完整性评估,如何帮助规划和执行油井干预措施,以确保所指示的故障。修井小组选择了一种方法,在钻机到达该位置之前对障碍状态进行调查。地面诊断包括压力趋势评估、完井设计、泄漏液成分和钻井记录分析,这些都指导了井下测量的选择。井下穿越屏障诊断的输入参数包括:井下穿越屏障诊断的目标是评估井内屏障的泄漏路径和故障,包括:本文探讨了井下诊断的概念、规划、执行和取得的结果,以及作业者如何实施这些结果。
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