EFFICIENT APPLICATION OF TRANSFORMATION OF REDUCED VARIABLES AND CONDITIONAL TESTING OF STABILITY WHEN COMPLETING INSTANT MISSIONAL EVAPORATION WHEN MODELING A PLATE COLLECTOR

摘要

Methods and a computer-readable medium are provided for simulating a composite underground hydrocarbon containing reservoir. The given variables for flash analysis are used with the conditional stability testing methodology to achieve the optimal efficiency of the phase behavior calculations in the model of a composite reservoir. The phase with the smallest amount is selected as the primary variable for the primary phase, and the phase with the largest amount is selected as the secondary phase to ensure stability without dividing by a value of about zero due to the choice of the primary phase as being associated with the phase that has the smallest amount. A limited interval can be used to limit the solution changes in the algorithms of the given variables to achieve greater stability of the algorithms. Stability testing can be performed during flash analysis using the given variables, using the direct difference form, based on the definition of the given variables and the condition of the distance to the contact plane.