Development of gas- saturation during solution- gas drive in an oil layer below a gas cap

Abstract

Solution- gas drive is usually described as a parallel flow of oil and gas, without regard for the gravitational factor. Under the influence of gravity, gas evolving from the oil will migrate upwards, accumulating in a gas cap at the top of the formation, before flowing into the producing wells. It is essential to known the magnitude of the gas saturation. This paper describes test which shows that theupward migration of gas depends on two conditions related to capillary pressure. The conditions, dispersion and nondispersion, both may occur in oil reservoirs.