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- W1979127199 abstract "Abstract Wellbore flow and interactions between wells and the reservoir can be complex. Accurate modeling of these behaviors is especially important for advanced (multi-lateral) wells. This paper describes a new scalable linear solver for flow simulation of detailed unstructured models with coupled multi-lateral multi-segment wells. The linear solver accommodates systems associated with both the fully implicit approach and the adaptive implicit method (AIM). A general-purpose research simulator (GPRS) serves as the computational platform, in which reservoir flow is described with a thermal-compositional AIM formulation, and a multi-segmented well (MsWell) model is used to describe wellbore flow. In the MsWell model, the wellbore is discretized into segments; pressure, velocity, and phase fractions are computed for each segment. Multi-lateral multi-segment wells add a large number of equations and unknowns, which are coupled to the reservoir model. The new linear solver is a generalized two-stage constraint pressure residual (CPR) preconditioner. The first stage is a global pressure system of equations, where the pressure coupling between the reservoir and the complex wells is represented accurately. This coupled pressure system is obtained algebraically, where the multi-segment wells are reduced to a form similar to that of standard wells. The two-stage scheme serves as the inner loop of a generalized minimum residual (GMRES) iterative solver. Algebraic multigrid (AMG) is used to compute the first-stage pressure solution; a special block-based incomplete lower-upper (ILU) preconditioner with arbitrary levels of fill-in is used for the second stage. This multi-stage solution algorithm was implemented using multi-level, sparse, block-based (MLSB) data structures specially designed for AIM computations on unstructured grids. We demonstrate the superior performance of this new solver compared with state-of-the-art methods using a variety of compositional problems for highly detailed reservoir models with unstructured grids and complex multi-segment wells." @default.
- W1979127199 created "2016-06-24" @default.
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- W1979127199 date "2009-02-02" @default.
- W1979127199 modified "2023-10-18" @default.
- W1979127199 title "Scalable Multi–stage Linear Solver for Coupled Systems of Multi–segment Wells and Complex Reservoir Models" @default.
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- W1979127199 doi "https://doi.org/10.2118/119175-ms" @default.
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