| Popis: |
Abstract This paper describes the evaluation, design, implementation, and operation of a large miscible CO2 tertiary pilot in the Goldsmith San Andres Unit (GSAU), Ector County, Texas. The pilot consists of nine inverted (injector-centered) 5-spot patterns covering approximately 320 acres and is located in a mature area of the field where the majority of the wells had been plugged due to high water cuts. The pilot location was selected based on geology and reservoir performance during waterflood. A CO2 pilot was chosen, rather than full- field implementation, to investigate uncertainties associated with the CO2 target oil saturation, the feasibility of re-entering abandoned wellbores, and overall CO2 flood performance. CO2 injection in the pilot commenced in December of 1996. The project benefited from available technology on CO2 flooding and particularly from information on other San Andres CO2 floods. The paper summarizes the methods used in the early project evaluation/design, data acquisition programs, reservoir simulation and CO2 flood predictions, and project implementation. The reservoir management plan, actual performance to date, and future potential are also discussed. The process used (methodology and technical analysis) to evaluate and design the GSAU CO2 pilot are applicable to other potential Permian Basin CO2 floods. P. 23 |
