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.
Energy Sources
Volume 27, 2005 - Issue 16
135
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Original Articles
Why Many Overpressured, Stress-Sensitive Hydrocarbon Reservoirs Should Not Be Abandoned
George V. Chilingar
Russian Academy of Natural Sciences, USA Branch, Los Angeles, California, USA
, H. H. Rieke
University of Louisiana at Lafayette, Lafayette, Louisiana, USA
& Ammal F. Al-Anazi
University of Southern California, Los Angeles, California, USA
Pages 1495-1501
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Received 15 Mar 2005, Accepted 15 Aug 2005, Published online: 16 Aug 2006
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