This paper was selected for presentation by an SPE Pmgmm Committee following review C4 information contained in an abstract submitted by the author(s). contents of the Pawr, as presented, have not been reviewed by the S&ety of Petroleum Engineers and are subject to comdim bythea!dhor(s), The material, 'as presented, does not necessarily reflect any p&tion of the Scciety of Petroleum Engineers, its offisers, or members Papers presented at SPE nwetings are subject to publication rw'ew by Editorial Committees of the Society of Petroleum Engineers, Electronic reproduction, distribution, or storage of any part of this paper for commercial pups without the written consent of the Sociely of Petroleum Engineers is prohibited. Permission to mprcduce in print is mstristed to an abstract of not more than 300 W1-dq WrsMhs may d be copied. The abstract must sontain mnspicuous acknc?.viedgnwrt of where and by whom the paper was presented. Write Librarian, SPE, PO, Box 333833, Richardson, TX 75083-38S6, U.S. A,, fax 01-972-952-9435, AbstractA Ml fieldreservoir simulation model was constructed for the31 S StructureStevens reservoirs, The size of the model is 29,070 grid cells with 26,889 active cells. Results from history matching the medel show that all the Stevensreservoirs on the 3 I S Structure are in communication. This paper illustrates the use of reservoir simulation technology as a tool to diagnose the performance of a systemof comple~multiple and conjugate reservoirs and quantt he extent of fluid migration that may have occurred among them.
The five principles of reservoir management are: 1. Conservation of reservoir energy. 2. Early application of simple strategies. 3. Sustained and systematic collection of data. 4. Implementation of improved technologies. 5. Long term retention of staff in multi-disciplinary teams. These principles can be combined with emerging technologies to devise and implement optimized reservoir management strategies. Advances in technologies for optimization of reservoir management strategies have made significant advances in the areas of real-time reservoir monitoring, interval flow control, and downhole flow measurements. The petroleum industry can achieve real-time reservoir management by installing these revolutionary technologies to improve and optimize economic recovery of hydrocarbons. Installations of downhole sensors and inflow control devices in many wells with data transmission/communication links have created a new class of smart/intelligent wells. Smart/Intelligent wells are equipped with devices that enable remote monitoring, control, and transmission of data from multiple zones thereby providing capabilities to reduce remedial costs and optimize reservoir performance. Data analytics can be used to ‘mine’ the huge data collected from these wells and fields and used to improve production processes. Field examples that demonstrate applications of the five principles of reservoir management with installation of advanced technologies to improve reservoir management and hydrocarbon recovery are: 1. The Agbami Field, Offshore Nigeria 2. The 26R Reservoir in California, USA and 3. The Shaybah Field in Saudi Arabia.
Extensive PVT data were collected from Elk Hills Stevens reservoirs over a period of 34 years. PVT reports exist for thirty-eight bottom hole samples and five recombined samples. The reports are available upon request to other companies operating the Stevens or similar reservoirs. PVT correlations are provided for estimation of routine properties such as: bubble-point pressures, oil formation volume factors, solution gas-oil ratios, saturated oil viscosities, undersaturated isothermal oil compressibility factors etc. Availability of excellent PVT data has been very useful in the development and execution of management strategies for the reservoirs. Introduction The Elk Hills Oil Field also known as Naval Petroleum Reserve No. 1 (NPR-1) is located in the Southern San Joaquin Valley of Central California, about 20 miles WSW of Bakersfield (Figure 1). It has three extensive anticlines, namely: the 31S Structure, the Northwest Stevens Structure and the 29R Structure (Figure 2). Each structure contains two or more known Stevens reservoirs. The reservoirs' estimated original oil-in-place, recoverable reserves and cumulative production are shown in Table 1. The Stevens reservoirs at Elk Hills occur at depths varying from 3,500 feet to 8,500 feet sub-sea. They cover 30,600 acres with a productive volume of approximately 1.9 million acre-feet. Total original oil-in-place are estimated to be 3 billion barrels with proved reserves of 117 million barrels. The reservoirs have produced over half a billion barrels of oil (Table 1). It is believed the Naval Petroleum Reserve at Elk Hills has the most comprehensive collection of PVT data in the Miocene obtained at initial reservoir conditions available in this area. These consist of thirty-eight bottom-hole samples and five recombined samples. The samples provide excellent sources of reservoir fluid properties for the Stevens zone which is a major producer in many California fields. This paper is intended to achieve the following:Provide extensive reservoir fluid property (PVT) data to the technical literature.Provide correlational equations for estimation of PVT properties for other Stevens or similar reservoirs. P. 279
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