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Title: The effects of in-situ emulsion formation and superficial velocity on foam performance in high-permeability porous media

Journal Article · · Fuel
 [1];  [2];  [2]
  1. Univ. of Wyoming, Laramie, WY (United States); OSTI
  2. Univ. of Wyoming, Laramie, WY (United States)

Foam has been considered as a mobility control agent for Enhanced Oil Recovery (EOR) applications in heterogeneous and fractured reservoirs. Foam enhances sweep efficiency by enabling the injected gas to flow from high-permeability to low-permeability regions. The foam injection velocity is an essential factor affecting foam mobility control and flow behavior. Furthermore, the presence of remaining oil adversely impacts foam generation leading to a failure in governing mobility control. In this study, foam performance in establishing mobility control effect and favorable apparent viscosity was experimentally investigated under a range of total superficial velocities in the presence and absence of crude oil during foam propagation in high permeability sand packs representing a propped fracture network. In the absence of oil, a pronounced effect of total superficial velocity on the mobility control performance was observed at the transition foam quality regime. Co-injection of oil and foam led to noticeable foam destabilization, as expected. However, a further increase in oil fractional flow resulted in larger overall flow resistance. We found that the formation of in-situ surfactant/oil emulsion contributed to the high apparent viscosity exhibited at the steady-state condition. These findings suggest that the steady-state flow resistance established during foam flooding at high oil saturations should be interpreted as the mobility control effect resulting from emulsion formation rather than the development of strong foam.

Research Organization:
Univ. of Wyoming, Laramie, WY (United States)
Sponsoring Organization:
Hess Corporation; USDOE; USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0031787
OSTI ID:
1977132
Journal Information:
Fuel, Journal Name: Fuel Journal Issue: C Vol. 306; ISSN 0016-2361
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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