用于定位遗留油气井的最佳磁强计横截面间距:初步结果

J. Patton, Michael G. Davis, Kenyon J. Gowing, Hunter B. Vickers
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引用次数: 0

摘要

该项目的目的是使用Overhauser磁力计检查最佳样带间距,以定位遗留油气井。众所周知,遗留油气井具有潜在的环境危害,可以作为甲烷和/或深层地下流体(天然存在的盐水、注入的废液或注入的CO2)到地表或浅层地下的管道。许多堵塞的油井都拆除了所有的地面设备,在地面上没有留下可见的痕迹,因此很难对这些油井进行环境评估。使用磁力计沿着一组预定义的横断面,可以检测到金属外壳的磁异常。为了评估大量的井,了解典型的异常大小对于最大化样带间距并因此最小化磁强计场工作时间至关重要。在这里,我们简要回顾了文献中报道的宽范围的样带间距,并展示了五口井的结果,这些井的初始测量网格间距为两米。尽管异常大小(X、Y和Z)存在显著变化,但20m的样带间距足以使用本文描述的方法识别所有埋藏井。与其中四个井相关的异常范围约为1000-4000纳特斯拉(nT),而一个井异常显示出高于背景的10000纳特斯拉以上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimum Magnetometer Transect Spacing to Locate Legacy Oil and Gas Wells: Preliminary Results
The purpose of this project was to examine the optimum transect spacing to locate legacy oil and gas wells using an Overhauser magnetometer. Widely known to be a potential environmental hazard, legacy oil and gas wells may act as a conduit for methane and/or deeper subsurface fluids (naturally occurring brines, injected waste fluids, or injected CO 2 ) to the surface or shallow subsurface. Many plugged wells have all surface equipment removed leaving no visible trace at the surface and thus making the environmental assessment of these wells difficult. Using a magnetometer along a set of predefined transects, magnetic anomalies from the metal casing can be detected. In order to assess large numbers of wells, understanding the typical anomaly size is critical to maximize the transect spacing and therefore minimize magnetometer field work time. Here we briefly review the wide range of transect spacings reported in the literature and show the results of five wells with an initial survey grid at two meter spacing. Although there is significant variation in the anomaly size (X, Y, and Z), transect spacing of 20 m was sufficient to identify all buried wells using the method described herein. The anomalies associated with four of the wells ranged from approximately 1000-4000 nanoteslas (nT), while one well anomaly exhibited more than 10,000 nT above background.
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