Reservoir simulation: state-of-the-art

This paper describes the current reservoir simulation model formulations and equation-solving methods. Emphasis is given to the development in recent years of different models to simulate the recovery mechanisms and phenomena active in a variety of enhanced recovery process. Several recent, significant advances are discussed and illustrated, including: 1) a nine-point difference scheme; 2) equation-of-state usage; and 3) increased machine speed, storage and vectorizaiton capability contributing to larger, more detailed field studies. 76 refs.