An analysis of miscible flooding chase-fluid strategies

Journal Article · Fri Nov 01 04:00:00 EST 1991 · SPE (Society of Petroleum Engineers) Reservoir Engineering; (United States)

DOI:https://doi.org/10.2118/19866-PA· OSTI ID:5438112

Walsh, M P ^[1]

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1. Texas A and M Univ., College Station, TX (United States)

This paper presents a fractional-flow-theory analysis of miscible flooding chase-fluid strategies. Graphical solution methods to analyze flood performance for arbitrary solvent/water ratios, chase gas/water ratios (GWR's), and solvent slug sizes are presented. The graphical solution techniques include methods to predict the effects of wave interference, an important precursor to oil-bank destruction or loss in mobility control. An examination of interference leads to a deeper understanding of the miscible slug process. The advantages and disadvantages of chase-water, chase-gas, and simultaneous chase-gas/water injection are summarized. The analysis provides the theoretical basis for many chase-fluid design practices, including the idea of a minimum solvent slug size to ensure displacement integrity and the concept of an optimal chase GWR to minimize solvent requirements.

• OSTI ID: 5438112
• Journal Information: SPE (Society of Petroleum Engineers) Reservoir Engineering; (United States), Journal Name: SPE (Society of Petroleum Engineers) Reservoir Engineering; (United States) Vol. 6:4; ISSN SREEE; ISSN 0885-9248
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CHEMICAL COMPOSITION
DISPLACEMENT FLUIDS
ENHANCED RECOVERY
FLUID FLOW
FLUID INJECTION
FLUID INJECTION PROCESSES
FLUIDS
GAS INJECTION
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
PHASE STUDIES
PLANNING
ROCK-FLUID INTERACTIONS
SOLVENTS
WATERFLOODING
WELLS