![]() ![]() However, for pressures below the bubble-point, the computed PVT properties may have considerable error. Most of these correlations yield reasonably accurate results when applied at the bubble-point pressure. Introduction Many correlations for estimating crude oil PVT properties have been published in the past 50 years. This correlation fits our data base of 728 laboratories measured bubble-point pressures more closely than other published correlations.Īll three of the proposed correlations require the usual field data solution gas-oil ratio at the bubble-point, reservoir temperature, separator gas specific gravity, and stock tank oil gravity. In addition to solving the deficiencies discussed above, the proposed correlations fit our data base of 2097 laboratory measured values much more closely than other published correlations.Īlso, we propose a modification of an existing bubble-point pressure correlation which can be used in the event that a field-data derived bubble-point pressure is not available. Further, the proposed correlation connects these fluids properties in material balance format. ![]() We propose an oil formation volume factor calculation which is based on the solution gas-oil ratio correlation described above so that the first two deficiencies are alleviated. Published correlations for oil formation volume factors for pressures at and below bubble-point pressures suffer the same two deficiencies plus a third problem: the material balance connection between oil formation volume factors, solution gas-oil ratios, and reservoir oil densities is not honored. We propose a correlation where the equations are formulated to solve both of these problems. Second, bubble-point pressure must be estimated using the same correlations there is no convenient way to impose a known bubble-point pressure - such as one derived from reservoir pressure data. ![]() First, calculated values of solution gas-oil ratios do not match the concave up - point of inflection - concave down shapes as pressure declines below the bubble-point that are evident in experimental data, especially at high initial gas-oil ratios. Abstract Virtually all of the published correlations for solution gasoil ratios for pressures at and below bubble-point pressures suffer from two major deficiencies. ![]()
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