Optimum Plan of Depletion
- A.L. Eden (Cities Service Oil and Gas Corp.) | M.J. Fox (Cities Service Oil and Gas Corp.)
- Document ID
- Society of Petroleum Engineers
- SPE California Regional Meeting, 23-25 March, Long Beach, California
- Publication Date
- Document Type
- Conference Paper
- 1988. Society of Petroleum Engineers
- 7.1.10 Field Economic Analysis, 2.2.2 Perforating, 5.5 Reservoir Simulation, 5.7.5 Economic Evaluations, 3.1.2 Electric Submersible Pumps, 3.1 Artificial Lift Systems, 5.1.2 Faults and Fracture Characterisation, 5.5.8 History Matching, 5.2.1 Phase Behavior and PVT Measurements, 5.1 Reservoir Characterisation, 4.1.2 Separation and Treating, 4.3.4 Scale, 5.4.1 Waterflooding, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 7.1.9 Project Economic Analysis, 3 Production and Well Operations, 1.2.3 Rock properties, 1.6 Drilling Operations, 6.5.2 Water use, produced water discharge and disposal, 4.1.5 Processing Equipment
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Through the use of reservoir simulation, consideration of operational conditions and constraints, and application of economic analysis. an Optimum Plan of Depletion for a geologically complex reservoir located in a high operating cost environment has been formulated. This paper describes the approach used to formulate the depletion plan. Additionally, the reservoir model lends itself to extensive future use in evaluating operational changes and providing the necessary data to determine the economic viability of any potential changes. The model is and will continue to be a valuable reservoir management tool.
Development of the West Pico Lease of the Beverly Hills Field through the mid to late 1960's and early 1970's was governed primarily by the geologically complex structure. This same reason prohibits the use of general waterflood analysis and evaluation techniques for prediction purposes. In the current economic environment of the petroleum industry, effects of operational changes requiring significant expenditures must be economically justified based on the most applicable or best possible prediction techniques.
A simulation study encompassing the Main (or Hauser) Zone in the Fault Block `A' area of the lease was initiated. Available reservoir data was assimilated and used to construct a reservoir description which was input into a black-oil simulator that facilitated proper geometric description of the structure, The reservoir description was validated and further refined by matching historical production and pressure data. The simulator was then used to predict production performance under a continued operations scenario. Evaluation of the continued operations prediction and the saturation distribution resulting from the history match suggested future alternative operating scenarios to optimize oil recovery which, were then simulated and performance predictions were generated. By considering operating constraints, operating costs, and characteristics of the various artificial lift methods, future capital and expense requirements could be reasonably estimated. The predictions from each alternative operating scenario and the estimated required expenditures were then economically evaluated and compared to each other, with the most favorable resulting in the Optimum Plan of Depletion.
Field Development and Operation
The Beverly Hills Field is located in a densely populated area of Los Angeles, California. Figure l illustrates the location of the field relative to other producing fields in the northwest portion of the Los Angeles Basin. The West Pico area was discovered in December 1964. Field development was initiated in early 1966 using a central drilling pad from which a total of 58 directional wells were drilled. Development included the drilling and operation of several lease-line injection wells by the two neighboring operators to prevent drainage across lease lines. The West Pico Lease encompasses 241 surface acres with average well spacing approximately 4.2 acres per well, Well locations do not conform to typical pattern development.
Historically, the field has produced from three sandstone formations, the Repetto of Pliocene Age (at 4500 to 5000 feet subsea), and the Main (at 6000 to 6800 feet subsea) and Deep (at 7000 to 8000 feet subsea) which are of Miocene Age. On the West Pico Lease, the Main and Repetto Zones remain productive and the Deep has been abandoned. At present, several wells produce from both the Main and Repetto and production is commingled. The Main Formation contained approximately 75% of the total OOIP for the lease.
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