assessment of three phase relative permeability models for simulation of tertiary water and gas injection in water-wet and mixed-wet rocks

Providing reliable estimation of three-phase relative permeability is one of the most important concerns for prediction of recovery factor however obtaining three-phase relative permeability by means of laboratory experiments is a tedious process; therefore, there is a great tendency toward predicting this property empirically in most of the commercial softwares, merely few methods for estimation of three-phase relative permeability, such as stone, swi and baker are provided the drawback is that these models are developed for water-wet systems and high gas/oil ifts, while reservoir rocks are most likely non water-wet and oil/gas system are usually miscible or near-miscible in which gas/oil ift are whitin extra-low range in this paper we try to assess the validity of the recently developed three phase relative permeability for gas-water and water-gas injection scenarios the study covers both water-wet and mixed-wet systems under extra-low gas/oil ift condition required two-phase relative permeabilities as well as three-phase experimental data are obtained from previously published data a matlab code is developed and coupled with eclipse to assess the performance of other three-phase models evaluation of recently developed empirical models elucidated that these methods may have more decent predictions for mixed-wet core in gas-water and water-gas injection processes corey and land have the best predictions among different methods in water-gas injection process for water-wet core, land and aziz equations provide the best predictions