Why Many Overpressured, Stress-Sensitive Hydrocarbon Reservoirs Should Not Be Abandoned

G. Chilingar, H. Rieke, A. Al-Anazi
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引用次数: 5

Abstract

Most commercial oil sands exhibit shale resistivity ratios (ratio of normal R shn to observed R sho ) of less than approximately 1.6 in adjacent shales and can be reached without an expensive string of protection pipe. On the other hand, some experts claim that “no commercial production is found when the shale resistivity ratio reaches and/or exceeds 3.5.” This statement, however, needs further investigation Such wells often are highly productive initially and are characterized by extremely fast pressure depletion. Based on extensive compaction studies of rocks, the authors argue that the latter is due to plastic deformation (irreversible compaction) in undercompacted overpressured rocks with increasing effective stress soon after production is initiated (or during well testing). Thus, well tests could be quite misleading, and many er roneously condemned overpressured reservoirs should be reexamined, reevaluated, and strategies be developed to recover the oil and gas from these stress-sensitive reservoirs.
为什么不应放弃超压、应力敏感油气藏
在邻近的页岩中,大多数商业油砂的页岩电阻率比(正常电阻率与观察到的电阻率之比)小于1.6左右,无需昂贵的保护管柱即可达到。另一方面,一些专家声称,“当页岩的电阻率比达到或超过3.5时,就不会发现商业性生产。”然而,这种说法还需要进一步的研究,这些井通常在开始时产量很高,并且具有极快的压力耗尽的特点。基于对岩石的广泛压实研究,作者认为后者是由于欠压实超压岩石的塑性变形(不可逆压实),在生产开始后不久(或在试井期间)有效应力增加。因此,试井可能会产生很大的误导,许多曾经被认为是超压的储层应该被重新检查、重新评估,并制定策略,从这些应力敏感的储层中开采油气。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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