Отправлено: 27.06.07 02:23. Заголовок: Новая модель течения в среде с трещинно-кавернозным коллектором

A New Darcy-Stokes Flow Model for Cavity-Fractured Reservoir (SPE-106751)
D.L. Peng* (Southwest Petroleum U.), Z. Qi (Sinopec Zhongyuan Oilfield), B. Liang (U. of Texas at Austin) & X. Liu (Sinopec Northwest Co.)
SUMMARY
Conventional cavity-fractured reservoir has small sizes of cavity and the corresponding flow behavior is
presented by the equivalent model for fluid flow in porous media. However, in Tarim Basin, the biggest
land oil/gas-baring basin in China, many unconventional fractured reservoirs are found that cavities are the
main storage space while fractures offer flow paths. Current porous flow model are not applicable due to
the large cavities even with the scale of meter. A new flow model is needed to describe the flow behavior
in order to successfully develop these cavity-fractured reservoirs.
In this paper, fluid flow in Tarim cavity-fractured reservoirs is firstly studied by integrating geology and
reservoir engineering. As an example, Tahe Ordovician carbonate reservoir is analyzed in detail. Then, a
new Darcy-Stokes model for slightly compressible two-phase flow is built. In our model, flow area is
divided into porous flow region and free flow region according to flow characteristics. Porous flow region
obeys Darcy's law and is described by the flow in porous media with multiple porosities. On the other
hand, free flow region satisfies Navier-Stokes flow and the equation describing slightly compressible twophase
flow is developed. The connection at the interfaces of these two flow regions is derived by the
extension of Beavers-Joseph-Saffman boundary condition to two-phase flow.
The application of Darcy-Stokes flow model to Tahe reservoir demonstrates that this model gets better
prediction on oil production performance than the fractured model with dual porosity.

Основная игра идет с граничным условием связывающем застойные зоны с проточными
Помнится нечто подобное было уже лет 20-30-ть назад (использовал при обработке трасеров при наличии застойных зон - там "тяжелые хвосты")
Но дьявол тут может быть и не в пренебрежении к публикациям в СССР и в России, а в деталях