The following ropics related to the representation of two-phase (i.e. , gas and brine) flow in the licinity of the reposito~in the 1996 performance assessment (P.4) for the Y$'aste Isolation Pilot Plant (IVIPP) are discussed: (i) system of nordin--partial differential equations used to model two-phase flow, (ii) incorporation of repository . shafis imo model (iii) creep closure of repository. (iv) interbed fracturing, (v) gas generatio~(vi) capillary action in waste, (~ii) borebole rnode~(~lii) numtical SOhItjOn. and (k) gas rind btie flow across~ecified boundaries. Twophase flow calculations are a cereal part of the 1996 WIPP P.4 and supply results that are subsequently used in the calculation of releases to the surface at the time of a drilling intrusion (i.e., spalIings, direct brine releases) and longterm releases due to radionucIide transport by flowing groundwater.
A technique for using production data to detect and quantify poorly drained compartments in gas reservoirs is described. The method is based upon a multi-compartment, tank-like model with well performance specified by an in-flow relationship. The technique is validated against a detailed finite element simulation. Field examples are presented illustrating the utility of the technique to improve reservoir development strategies.
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