Use of X-ray computed microtomography to understand why gels reduce relative permeability to water more than that to oil

R. S. Seright, J. Liang, W. Brent Lindquist, John H. Dunsmuir

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

X-ray computed microtomography (XMT) was used to investigate why gels reduce relative permeability to water more than that to oil in strongly water-wet Berea sandstone. XMT allows saturation differences to be monitored for individual pores during various stages of oil, water, and gelant flooding. The method also characterizes distributions of pore size, aspect ratio, and coordination number for the porous media. We studied a Cr(III) acetate-HPAM gel that reduced permeability to water (at Sor) by a factor 80-90 times more than that to oil (at S wr). In Berea, the gel caused disproportionate permeability reduction by trapping substantial volumes of oil that remained immobile during water flooding (i.e., 43.5% Sor before gel placement versus 78.7% Sor after gel placement). With this high trapped oil saturation, water was forced to flow through narrow films, through the smallest pores, and through the gel itself. In contrast, during oil flooding, oil pathways remained relatively free from constriction by the gel.

Original languageEnglish
Pages (from-to)217-230
Number of pages14
JournalJournal of Petroleum Science and Engineering
Volume39
Issue number3-4
DOIs
StatePublished - Sep 2003

Keywords

  • Disproportionate permeability reduction
  • X-ray computed microtomography

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