屏障完整性压力测试

A. Raaen, E. Fjær
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引用次数: 2

摘要

通过封井和弃井,可以确保盖层的密封完整性得到恢复。这也意味着套管和岩石之间的环空是密封的。在适当的条件下,一些地层可能会靠近套管,为密封提供非常有价值的贡献。虽然可以使用声学工具来评估是否存在套管接触,但这种屏障的水力完整性必须通过对所有潜在地层的现场测试来确定。虽然本文主要关注的是天然页岩屏障,但分析和结论同样适用于水泥基和其他屏障的测试。本文讨论了用于此目的的两种压力完整性测试,xlot型测试和通信测试。概述了测试程序,并估计了预期的灵敏度。特别指出,温度效应可能使测试解释复杂化,可能使测试误接受和误拒绝。因此,在试验评估中包括温度测量是至关重要的。据估计,两项试验的泄漏检测极限都明显高于保证恢复密封完整性所需的目标值。这就要求改进测试程序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pressure Testing of Barrier Integrity
Plug and abandonment of a well is expected to ensure that the sealing integrity of the cap rock is restored. This also implies that the annulus between casing and rock is sealed off. Some formations may under the right conditions close in on the casing, providing a highly valuable contribution to the sealing. Although acoustic tools may be used to evaluate whether there is casing contact, the hydraulic integrity of such a barrier must be established by field testing for all potential formations. While the main focus here is on natural shale barriers, the analysis and conclusions apply equally well to testing of cement based and other barriers. This paper discusses two pressure integrity tests that are used for this purpose, the XLOT-type test and the communications test. The test procedures are outlined, and the expected sensitivity is estimated. In particular, it is shown that temperature effects may complicate test interpretation, possibly giving both false acceptance and false rejections of tests. Hence, it is of vital importance to include temperature measurements in the evaluation of the tests. It is estimated that the leakage detection limit of both tests is significantly higher than the target value needed to ensure that sealing integrity has been restored. This calls for improvements of the testing procedures.
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