Literally thousands of different molecular structures with different chemical and physical properties exist in crude oils. Therefore, it is virtually impossible to predict viscosity characteristics based on oil and water ratios. If specific emulsion factors have not been developed, the default emulsion factor curve can be used. However it applies only to horsepower, and factors for head and flow will need to be entered manually. Some amount of gas is helpful in reducing fluid viscosity, but an excessive amount of gas is disruptive to well fluid production.
Gas tends to migrate out of highly viscous fluid very slowly.
Therefore, a higher percentage of gas tends to pass through the pump with the produced well fluid. Handling gas in viscous fluids can be accomplished in one of two ways. A rotary gas separator may be used to separate the gas, or it may be passed through the pump. A large amount of free gas at the pump intake dictates the use of a gas separator. The effectiveness of a rotary gas separator will probably be somewhat diminished with viscous fluids because of the slow movement of gas through the fluid and the relatively short transit time through the gas separator.