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IMPACTS AND LESSONS LEARNED FROM AN APPLIED CASE STUDY IN TH
Subsurface characterization of fluid volumes is typically constrained and validated by core analytical fluid saturation measurement techniques (for example, Dean-Stark or open retort methodology). As production in resource plays has progressed over time, it has been noted that many of these methods have a large error when compared to production data. A large source of the error seems to be that water saturations in tight rocks have been consistently underestimated in the traditional laboratory measurement techniques. Operators need improved fluid saturation measurements to better constrain their log-based oil-in-place estimates and forward-looking production trends. The overall goal of this study is to test a new laboratory workflow for fluid saturation quantification. Recent advancements have led to an innovative methodology where a closed retort laboratory technique is applied to samples from lithological rock types in the Williston, Uinta, and DJ Basins. This new technique is specifically designed to better quantify and validate water measurements throughout the tight rock analysis process, as well as improved oil recovery and built-in prediction. A comparison of standard crushed rock analysis employing Dean-Stark saturation methods is compared to the closed retort results and observations discussed. Results will also be compared against additional laboratory methods that validate the results, such as geochemistry and nuclear magnetic resonance. Finally, openhole wireline logs will be used to demonstrate the quantified impact on total water saturation and the oil-in-place estimates based on the improved accuracy of the closed retort technique.
Standard price:
10.00
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Author(s):
Stephanie E. Perry, J. Alex Zumberge, Kai Cheng
Company(s):
GeoMark Research Ltd
Year:
2021
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