Solvent Placement Improvement by Pre-Injection of Water - Lobstick Cardium Unit, Pembina Field
- C.V. Kloepfer (Pan American Petroleum Corp.) | J.D. Griffith (Pan American Petroleum Corp.)
- Document ID
- Petroleum Society of Canada
- Journal of Canadian Petroleum Technology
- Publication Date
- January 1965
- Document Type
- Journal Paper
- 30 - 35
- 1965. Petroleum Society of Canada
- 5.2.1 Phase Behavior and PVT Measurements, 4.1.2 Separation and Treating, 5.1.1 Exploration, Development, Structural Geology, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 5.3.2 Multiphase Flow, 4.1.5 Processing Equipment, 5.4.9 Miscible Methods, 5.4.1 Waterflooding, 2.1.3 Sand/Solids Control
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Stratification of petroleum reservoirs plays an important role in theperformance of fluid injection pressure maintenance recovery projects. Thesignificance of this factor in miscible recovery applications is emphasizedbecause of the generally adverse mobility ratios common to this type ofproject. The initial distribution of a miscible slug among the strata of areservoir dictates the volume of the reservoir that can be miscibly swept asthe slug is subsequently driven through the reservoir. The slug volume requiredto achieve miscibility in all strata of any given reservoir generally becomesprohibitively large. Improvement in permeability contrast prior to solventplacement will effect improved solvent utilization and enhance the efficiencyof this recovery technique.
The reservoir in the Lobstick area of the Pembina Cardium pool is severelystratified. In the area of miscible application, a conglomerate member,representing about 30 per cent of the reservoir volume, has a capacity of aboutfifty times that of the underlying sand. To improve the native capacitydistribution and to afford an evaluation tool for early injection performance,a 400,000-barrel slug of water was injected ahead of the solvent slug.Theoretically, this pre-injection of water will double the effectiveness of theinjected solvent. The calculation method for determining the improvement ofsolvent placement for Lobstick is described in detail.
In miscible fluid displacement projects, reservoir stratification maysignificantly affect recovery because of the adverse mobility ratios common tosuch schemes. Solvent injection into a stratified reservoir will generallyresult in more permeable strata receiving a solvent volume in excess of thatrequired to effect complete miscible displacement before the less permeablezones have received the required minimum. The initial distribution of solventamong the reservoir strata governs the portion of the reservoir that can bemiscibly swept by the driving of this slug through the reservoir.
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