Abstract
Abstract This paper compares several recent flash algorithms in the context of compositional reservoir simulation. We evaluate three reduced equation methods: 1) the 3-equation flash of Michelsen (1986), which applies only when all binary interaction coefficients (kij) are zero; 2) Hendricks and van Bergen (1992); and 3) Kaul and Thrasher (1993). We also evaluate: 4) the non-iterative flash (Stenby and Wang, 1993); and 5) the method of Young (1991). We find that these last two methods, which are similar in concept, work well for reservoir simulation where the flash must be closely coupled with the solution of the pressure equation, and where a good initial guess is generally available. The reduced equation flashes offer no significant improvement over these other methods; this is true even for the 3-equation flash which solves a simpler problem (with kij = 0).
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