Application of a Reservoir Simulator Interfaced With a Surface Facility Network: A Case History
- E.J. Breaux (Chevron Services Co.) | S.A. Monroe (Chevron Services Co.) | L.S. Blank (Chevron (Geosciences Co.) | D.W. Yarberry Jr. (Standard Oil Co. of California) | S.A. Al-Umran (Aramco)
- Document ID
- Society of Petroleum Engineers
- Society of Petroleum Engineers Journal
- Publication Date
- June 1985
- Document Type
- Journal Paper
- 397 - 404
- 1985. Society of Petroleum Engineers
- 5.4.2 Gas Injection Methods, 5.5 Reservoir Simulation, 4.2 Pipelines, Flowlines and Risers, 4.1.4 Gas Processing, 4.1.2 Separation and Treating, 6.5.2 Water use, produced water discharge and disposal, 4.1.5 Processing Equipment, 5.2.1 Phase Behavior and PVT Measurements, 3.1 Artificial Lift Systems, 4.3.4 Scale, 3.1.6 Gas Lift, 3 Production and Well Operations, 1.6 Drilling Operations
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Management requires dependable information upon which to base decisions regarding large investments. The system discussed in this paper proves to be a viable tool for effectively managing reservoir development and provides several alternatives upon which management could base such decisions.
A three-dimensional (3D), three-phase reservoir simulator is interfaced with a surface facility network simulator. The results are used in determining an integrated field development and operating plan for producing an onshore-offshore oil reservoir at a specified producing an onshore-offshore oil reservoir at a specified rate. Various aspects of alternative development and facility installation scenarios are investigated with the interfaced system. The requirements and sizing of major surface facilities and a drilling and workover program are determined over a 25-year study period. The most efficient development plan is one that combines cost-effective drilling and facilities scheduling while at the same time providing maximum operating flexibility and balanced providing maximum operating flexibility and balanced reservoir development.
This technique has been applied to the future development planning of existing fields but is equally applicable to planning the development of new fields in any environment by altering the producing rules controls and reservoir and network models to account for the appropriate circumstances.
Complex alternative development plans are evaluated in a decreased amount of time with a reservoir simulator interfaced with a surface facility network model. This study differs from typical reservoir simulation studies by recognizing surface facility and gathering system constraints and by responding to those constraints during the same timestep.
The calculation procedure and example application of a reservoir simulator interfaced with a surface facility network simulator is presented by Emanuel and Ranney. The specific application of such a system to assist in planning the overall development of a major onshore offshore planning the overall development of a major onshore offshore oil reservoir is presented in this paper. The interfaced system simulates surface and subsurface pressures and three-phase fluid flow behavior throughout the system, allowing for the study of various operating strategies.
The reservoir studied is an elongated anticline with several domes and underlies a surface area located onshore and offshore. This is an undersaturated oil reservoir with low GOR and saturation pressure. There is a multiple energy drive mechanism, active water drive in the south and fluid and rock expansion with limited water drive in the north.
The current options for maintaining production from the field are limited to continued drilling and workovers. Production must be essentially dry and under natural Production must be essentially dry and under natural depletion since no water removal or artificial lift facilities are available. Production is being processed through three gas/oil separation plants. Primary development is along the crest of the structure, with drilling conducted from multiwell platforms.
Future options for maintaining production are water removal, gas lift, trunkline and facility expansions, water injection, additional drilling, and well workovers. The reservoir simulator is a finite-difference, black-oil simulator that uses a 3D, three-phase formulation with an option for an implicit pressure/explicit saturation (IMPES) solution.
Producing facilities are modeled using a multiphase producing facility simulator. This program simulates producing facility simulator. This program simulates steadystate, single- or multiphase fluid flow in wells, pipes, another equipment. Pressure loss calculations can be pipes, another equipment. Pressure loss calculations can be performed by a variety of methods published in the literature. performed by a variety of methods published in the literature. Fluid properties can be derived from generalized correlations, laboratory data, or compositional three-phase equilibrium calculations. A variety of network solution techniques are available; choice of technique depends on network complexity and fluid properties.
The interface links the surface network simulator to the reservoir simulator through a suite of coupling routines. The simulators used in this system are a reservoir simulator for all subsurface calculations and a surface-facility network simulator for all vertical, wellbore, and surface fluid flow computations.
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