Abstract
CO2-Prophet, a water and gas flood prediction software product, has been developed by Texaco with support of the U.S. Department of Energy (DOE). This paper describes the model and presents case comparisons with physical models and commercial reservoir simulators.
CO2-Prophet has been shown to be a good tool for screening and reservoir management and is being released to the industry complete with a detailed user manual. Ease of use was emphasized in the development of the user interface. CO2-Prophet runs on PC compatible computers and following are some of its features:
A front end for easy reservoir parameter input.
Several predefined patterns to simplify use.
The ability to design patterns to fit most situations
Fast computation.
Multiple flood regimes so water, gas, and miscible floods can be modeled.
Output in surface units and dimensionless formats.
Output designed for importing into a spreadsheet
CO2-Prophet computes streamlines between injection and production wells to form stream tubes. It then makes flow computations along the stream tubes. The mixing parameter approach, proposed by Todd and Longstaffis used for simulation of the miscible process. CO2-Prophet uses the Dykstra-Parsons2 coefficient to distribute the initial injection into a maximum of ten layers, and then fractional flow calculations determine the flows and fluid saturations along the stream tubes. Program inputs are pattern description, relative permeability curves, initial saturations, injection rates, and reservoir-to-surface conversions. A new case can be set up and run in a few minutes making this program ideal for the screening of EOR projects and pattern comparisons.
The hardware requirements to run CO2-Prophet are an Intel® 386 based PC or better with at least 4 megabytes of RAM and 4 megabytes of disk space free. A math coprocessor is required for 386 or 486SX systems.
