文档介绍：Black-Oil Delumping Techniques Based
positional Information From
Depletion Processes
Kassem Ghorayeb, SPE, and Jonathan Holmes, SPE, Schlumberger
Summary The third option, which offers the greatest accuracy, is to pro-
Black-oil reservoir simulation still has wide application in the petro- vide tables of reservoir liquid and ponent mole fractions
leum industry because it is far less putationally vs. saturation pressure. These can be obtained from a depletion
positional simulation. But a principal limitation of black- process, ideally the same process that was used initially to generate
oil reservoir simulation is that it does not provide the detailed the black-oil PVT tables. This technique, as we show in this paper,
compositional information necessary for surface process modeling. provides very accurate results in natural depletion processes and
Black-oil delumping es this limitation by converting a production processes involving reservoir repressurization by water
black-oil wellstream into positional wellstream, enabling the injection. Weisenborn and Schulte (2000) reported a similar de-
composition ponent molar rates of a production well in a lumping technique. However, they used the grid-cell pressure in-
black-oil reservoir simulation to be reconstituted. stead of saturation pressure (or averaged saturation pressure in the
We present prehensive black-oil delumping method case of a pletion spanning multiple grid-cell connections)
based primarily on positional information generated in the in the delumping scheme. The latter, as we show in Example 5,
depletion process that is used initially to provide data for the provides better results in the case of production processes involv-
black-oil simulation in a typical workflow. Examples presented in ing reservoir repressurization by water injection.
this paper show the accuracy of this method in different depletion Black-oil delumping based position-vs.-saturation pres-
processes: natural deple