Experimental measurement and modeling of the solubility and bubble pressure of nitrogen in white mineral oil

Evaluating the Effect of New Gas Solubility and Bubble Point Pressure Models on PVT Parameters and Optimizing Injected Gas Rate in Gas-Lift Dual Gradient Drilling

“…where R s is the solution gas-oil ratio (scf/STB), P is the pressure (psi), T is the temperature ( • F), and P b indicates the bubble point pressure (psi). These two models, with all their technical details, have already been discussed in the published literature and would be found at Negahban et al [23]. Nonetheless, the experimental procedure is briefly described as follows.…”

“…Therefore, the water and oil viscosity should be calculated. Since the viscosity mostly depends on temperature than pressure variations, the relation (23) represents the water viscosity [42].…”

“…In the case of using the Standing model for the solubility, how much error would happen to the other PVT parameters? Therefore, Negahban et al [23] conducted some experiments for finding solubility and bubble point of Nitrogen and white mineral oil for temperatures and pressures of deepwater reservoirs in the South China Sea. They used the Constant Composition Expansion (CCE) method for evaluating solubility and bubble pressure of the mixture at mentioned conditions.…”

“…They used the Constant Composition Expansion (CCE) method for evaluating solubility and bubble pressure of the mixture at mentioned conditions. They finally proposed two equations for solubility and bubble pressure and also found that the Standing model underestimates bubble pressure and overestimates solubility for the mixture of Nitrogen in white mineral oil [23].…”

“…With this in mind, in the present study, the two new models of Negahban et al [23], i.e., the solubility equation and bubble point equation as presented in the upcoming sections, were selected as the starting point of the research. The gap felt in the existing knowledge is the application of these two models to gas-lift dual gradient drilling, examining their effect on the thermodynamic properties of the injected gas and the drilling fluid and comparing the obtained results with the case of using the Standing correlations for solubility and bubble pressure.…”