Various incomplete factorization (ILU) methods coupled with ORTHOMIN acceleration are discussed. These include natural, D2 and D4 orderings with several degrees of factorization, the modified factorization (MILD) and the COMBINATIVE method. These techniques can also be used with the bordered systems resulting from fully-coupled, fully-implicit multi-block wells. Test results are reported for fully implicit black oil and fully implicit thermal simulations. Some results are also reported for vector and scalar modes on the CRAY.

Keywords:
iteration, scalar mode, incomplete factorization method, incomplete factorization, equation, ilu factorization, sparsely, densely, upstream oil & gas, matrix
Subjects:
Hydraulic Fracturing, Improved and Enhanced Recovery, Reservoir Simulation, Formation Evaluation & Management, Information Management and Systems
Copyright 1983, Society of Petroleum Engineers of AIME
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