High-Pressure Data and Modeling Results for Phase Behavior and Asphaltene Onsets of Gulf of Mexico Oil Mixed With Nitrogen
- Odd Steve Hustad (Statoil ASA/NTNU) | Na Jia (Schlumberger DBR Technology Center) | Karen Schou Pedersen (Calsep A/S) | Afzal Memon (Schlumberger) | Sukit Leekumjorn (Calsep Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2014
- Document Type
- Journal Paper
- 384 - 395
- 2014.Society of Petroleum Engineers
- 5.2.2 Fluid Modeling, Equations of State, 5.2 Reservoir Fluid Dynamics, 4.3.3 Aspaltenes, 5.2.1 Phase Behavior and PVT Measurements, 1.8 Formation Damage, 5.4.10 Microbial Methods
- phase properties, asphaltene, phase envelope
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- 452 since 2007
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This paper presents fluid composition, high-pressure pressure/volume/temperature (PVT) measurements, and equation-of-state (EoS) modeling results for a recombined Tahiti oil, Gulf of Mexico (GoM), and for the oil mixed with nitrogen in various concentrations. The data include: - Upper and lower asphaltene onset pressures and bubblepoint pressures for the reservoir fluid swelled with nitrogen. At the reservoir conditions of 94 MPa (13,634 psia) and 94°C (201.2°F), asphaltene precipitation is seen after the addition of 27 mol% of nitrogen. - Viscosity data for the swelled fluids showing that the addition of nitrogen significantly reduces the oil viscosity. - Slimtube runs indicating that the minimum miscibility pressure (MMP) of the oil with nitrogen is significantly higher than estimated from published correlations. The data were modeled with the volume-corrected Soave-Redlich- Kwong (SRK) EoS and the perturbed-chain statistical association fluid theory (PC-SAFT) EoS. Although both equations provide a good match of the PVT properties of the reservoir fluid, PC-SAFT is superior to the SRK EoS for simulating the upper asphaltene onset pressures and the liquid-phase compressibility of the reservoir fluid swelled with nitrogen. Nitrogen-gas flooding is expected to have a positive impact on oil recovery because of its favorable oil-viscosity-reduction and phase behavior effects.
|File Size||1 MB||Number of Pages||12|
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