Density, compressibility and phase equilibrium of high pressure-high temperature reservoir fluids up to 473 K and 140 MPa

High-pressure phase equilibrium and volumetric properties of pseudo-binary mixtures of stock tank oil + methane up to 463K

“…However, it should be noted that the HPHT conditions [3] in the oil industry refer to pressures higher than 69 MPa and temperatures higher than 150 o C. Most of the high-pressure equilibrium and density data in the aforementioned sources do not belong to the HPHT conditions, therefore not directly useful. Some recent experimental efforts, [11], [24]- [34] including the measurements by our laboratory, [30]- [34] have been dedicated to hydrocarbon systems at conditions more relevant to HPHT reservoirs. Most of these measurements are for well-defined binary mixtures.…”

“…Regueira et al [32] [33] measured the equilibrium and volumetric data of four synthetic alkane mixtures, including two ternaries, one six-component gas condensate, and one six-component volatile oil. Only two of these recent studies use real reservoir fluids [34] or recombined fluids from crude oil [11] . The HPHT data for well-defined mixtures are still scarce, and it is always desirable to fill the gap with more measurements to assist the model development for these mixtures related to HPHT reservoir fluids.…”

“…It should also be realized that the well-defined mixtures are not sufficiently representative of reservoir fluids, as shown by our previous studies. [30]- [34] This is because the heavy components in reservoir fluids are diverse and unique, and cannot be easily replaced by a few well-defined components. [32]- [34] For better modeling of real HPHT fluids, it is necessary to extend the measurement to real reservoir fluids or -synthetic‖ reservoir fluids containing the heavy ends from real reservoir fluids.…”

“…[30]- [34] This is because the heavy components in reservoir fluids are diverse and unique, and cannot be easily replaced by a few well-defined components. [32]- [34] For better modeling of real HPHT fluids, it is necessary to extend the measurement to real reservoir fluids or -synthetic‖ reservoir fluids containing the heavy ends from real reservoir fluids. Since it is costly to obtain real reservoir fluid samples, HPHT measurements of real reservoir fluids are rarely reported in the open literature.…”

“…In this study, we prepared live fluid mixtures by combining methane and STO at different ratios, which is in contrast with our previous studies using well-defined mixtures [30]- [33] and real reservoir fluids. [34] These mixtures can be considered as pseudo-binaries of asymmetric components, and are better than the well-defined mixtures to represent real reservoir fluids.…”