Improved Reservoir CharacterizationA Key to Future Reservoir Management for the West Seminole San Andres Unit
- Kenneth J. Harpole (Cities Service Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- November 1980
- Document Type
- Journal Paper
- 2,009 - 2,019
- 1980. Society of Petroleum Engineers
- 1.6.9 Coring, Fishing, 1.6 Drilling Operations, 5.5.8 History Matching, 5.8.7 Carbonate Reservoir, 5.2.1 Phase Behavior and PVT Measurements, 3 Production and Well Operations, 6.5.2 Water use, produced water discharge and disposal, 5.1 Reservoir Characterisation, 4.3.4 Scale, 4.1.5 Processing Equipment, 5.6.3 Pressure Transient Testing, 4.6 Natural Gas, 5.5 Reservoir Simulation, 5.1.1 Exploration, Development, Structural Geology, 4.1.2 Separation and Treating, 5.4.1 Waterflooding, 5.6.4 Drillstem/Well Testing, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.4.2 Gas Injection Methods, 5.5.2 Core Analysis
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A comprehensive reservoir study using a black-oil simulation model showed that control of vertical movement of oil into the gas cap under waterflood operations was the key to maximizing oil recovery from this west Texas San Andres reservoir. Recovery of an additional 4 MMSTB of oil is expected as a result of a reservoir management plan which includes a 46-well infill drilling program.
Improved reservoir description is becoming recognized as an essential requirement for effective reservoir management. This is particularly important for the extremely heterogeneous, geologically complex San Andres carbonate reservoirs of west Texas. The West Seminole field in west central Gaines County, TX, (Fig. 1) produces from the San Andres formation at an average depth of approximately 5,100 ft. Fig. 2a shows the general structural configuration of the reservoir; it consists of a large main dome with a smaller dome structure to the east. A large primary gas cap, shown schematically in Fig. 2b, covers most of the field area. A summary of basic reservoir and fluid data is presented in Table 1.
Throughout the field's producing life, there has been a question about the extent of vertical communication within the reservoir, particularly between the oil zone and the overlying gas cap. This question became a critical operating consideration when a pattern waterflood was proposed in the early 1970's. An extensive reservoir study was undertaken to predict the future production performance of the field under waterflood operations.
The overall objective of this study was to develop the most profitable and effective reservoir management program for the West Seminole San Andres Unit. The following specific objectives and procedures were developed for the work.
1. Use all available geologic and engineering data to develop a detailed and accurate reservoir description for this field.
2. Incorporate the reservoir description information into a black-oil computer simulation model. Use the simulator to verify and further refine the reservoir description by history matching the pressure and production data.
3. Use the history-matched simulation model to project future reservoir performance under current waterflood operations.
4. Evaluate various alternative operating plans and recommend the most effective reservoir management program for the unit.
|File Size||800 KB||Number of Pages||11|