Role of three-hydrocarbon-phase flow in a gas-displacement process

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · SPE Reservoir Engineering

DOI:https://doi.org/10.2118/24115-PA· OSTI ID:87568

Mohanty, K K ^[1]; Masino, Jr, W H; Ma, T D ^[2]; Nash, L J ^[3]

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1. Univ. of Houston, TX (United States)
2. Arco Alaska Inc., Anchorage, AK (United States)
3. Energy Biosystems Corp., The Woodlands, TX (United States)

The objective of this work is to identify the role of three-hydrocarbon-phase flow in the displacement of a reservoir oil by light-hydrocarbon-gas mixtures (methane through n-butane). Slim-tube displacements were conducted with several hydrocarbon-gas mixtures. A compositional simulator capable of handling three nonaqueous phases was used to simulate these 1D displacements. Slim-tube experiments show that as dilution with lean gas increases, the displacements go from first-contact miscible to multicontact miscible to three-phase, 3{phi}, immiscible to two-phase, 2{phi}, immiscible. Recovery is high (> 85%) at high enrichment, but nonmonotonic with dilution. Simulation results mimic experimental slim-tube recovery and gas-breakthrough behavior qualitatively; especially the increase in oil recovery with increasing methane dilution of the solvent. High oil recoveries in the 3{phi} cases appear to be the result of condensation of solvent into the oil, resulting in (1) low oil viscosity and (2) effective displacement of oil by the second liquid phase that forms.

• Sponsoring Organization: USDOE
• OSTI ID: 87568
• Journal Information: SPE Reservoir Engineering, Journal Name: SPE Reservoir Engineering Journal Issue: 3 Vol. 10; ISSN 0885-9248; ISSN SREEEF
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
FLOW MODELS
GAS INJECTION
MULTIPHASE FLOW
OIL WELLS
SWEEP EFFICIENCY
WELL STIMULATION