Waterflooding in the Eagle Ford shale formation: Experimental and simulation study

Samiha Morsy, J. J. Sheng, M. Y. Soliman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

Waterflooding is the cheapest and most profitable secondary recovery method that has been used for more than seventy years for conventional oil reservoirs. However, few studies have been done on its viability on unconventional tight formations especially shales. The objective of this paper is to study the potential of waterflooding in Eagle Ford shale formation through water imbibition experiments on reservoir rock samples and simulation study using Eagle Ford shale published data. In the experimental study, distilled water and 2% KC1 brine solutions were examined to recover oil from different Eagle Ford shale reservoir samples. The samples were 2.54 to 3.81 cm in diameter and 0.762 to 5.08 cm in length. First, we studied the porosity of samples using CT Scanning. The average porosity of the studied samples varied from 1% to 5%. Second, we studied the spontaneous imbibition of the different used samples in distilled water and 2% KG for one week. During the spontaneous imbibition, the maximum oil recovery was 19% from the samples placed in distilled water against 12% from the samples placed in 2% KCl brine solution. The higher recovery achieved by the distilled water was due to cracking from clay swelling which was not observed with the 2% KCl brine solution. The samples exposed to distilled water for one week during the spontaneous imbibition experiment showed more tendency to break down when low confining pressure was applied due to clay swelling. The simulation study using Eagle Ford reservoir fluid and rock data along with completion data revealed a good potential for waterflooding using closer spacing between the oil producer and the water injector fractures that forced the injected water to invade the hydraulic created fractures, natural fractures, and the reservoir matrix as well, which maximized the oil recovery. Collectively, our experimental and simulation study showed a good potential of waterflooding in Eagle Ford shale formation.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Asia Pacific Unconventional Resources Conference and Exhibition 2013
Subtitle of host publicationDelivering Abundant Energy for a Sustainable Future
PublisherSociety of Petroleum Engineers
Pages578-588
Number of pages11
ISBN (Print)9781629936000
DOIs
StatePublished - 2013
EventAsia Pacific Unconventional Resources Conference and Exhibition 2013: Delivering Abundant Energy for a Sustainable Future - Brisbane, QLD, Australia
Duration: Nov 11 2013Nov 13 2013

Publication series

NameSociety of Petroleum Engineers - Asia Pacific Unconventional Resources Conference and Exhibition 2013: Delivering Abundant Energy for a Sustainable Future
Volume2

Conference

ConferenceAsia Pacific Unconventional Resources Conference and Exhibition 2013: Delivering Abundant Energy for a Sustainable Future
CountryAustralia
CityBrisbane, QLD
Period11/11/1311/13/13

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