Abstract
The article is devoted to the determination of the critical water saturation ratio productive reservoirs. It is necessary to have information about these coefficients in order to interpret the geophysical research wells at the stage of exploration. The print media publish Burdine formulas, which contain definite integrals, to determine the coefficients that need to be solved. In this case, the upper and lower limits of the integrals in the works of different authors don't completely coincide. The author of this article analyses Burdine formulas, which have been published in various print media, and proposes Burdine formulas without integrals. As a result, it is established that Burdine formulas, which are presented in the work [6], are suitable for real conditions; but there should be taken into account the conditions under which the relative phase permeability of oil and water is equal to 0 and 1.
Highlights
Оценка характера насыщения коллекторов по данным геофизических исследований скважин (ГИС) может проводиться по критическим значениям коэффициентов водонасыщенности ( К вкр ), установленным статистическим или петрофизическим способами
The article is devoted to the determination of the critical water saturation ratio productive reservoirs
The author of this article analyses Burdine formulas, which have been published in various print media, and proposes Burdine formulas without integrals
Summary
К п — коэффициент пористости, К ПР — коэффициент абсолютной газопроницаемости, К в — коэффициент водонасыщенности, К но — коэффициент остаточной нефенасыщенности, Р к — капиллярное давление при лабораторных условиях. 1) Рк = f( К в ) перестраиваются в кривые относительной фазовой проницаемости по нефти и воде, которые являются функцией К в
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