000			02179nab a2200217 4500
005			20260520004415.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aAccurate Modeling of Faults by Multipoint, Mimetic, and Mixed Methods
260			_a _b _cjun. 2012
270			_a25/01/2013 ; 23/01/2013
300			_a11 p. ; 568-579
520			_aTranscripción del resumen del autor: The predominant way of modeling faults in industry-standard flow simulators is to introduce so-called transmissibility multipliers in the underlying two-point discretization. Although this approach provides adequate accuracy in many practical cases, two-point discretizations are only consistent for K-orthogonal grids and may introduce significant discretization errors for grids that severely depart from being K-orthogonal. Such grid-distortion errors can be avoided by lateral or vertical stair-stepping of deviated faults at the expense of errors in the geometrical fault description. In other words, modelers have the choice of either making (geometrical) errors by adapting faults to a grid that is almost K-orthogonal, or introducing discretization errors because of the lack of K-orthogonality if the grid is adapted to deviated faults. We propose a method for accurate description of faults in solvers based on a hybridized mixed or mimetic discretization, which also includes the MPFA-O method. The key idea is to represent faults as internal boundaries and calculate fault transmissibilities directly instead of using multipliers to modify grid-dependent transmissibilities. The resulting method is geology-driven and consistent for cells with planar surfaces and thereby avoids the grid errors inherent in the two-point method. We also propose a method to translate fault transmissibility multipliers into fault transmissibilities. This makes our method readily applicable to reservoir models that contain fault multipliers.
581			_a2
773	0		_tSPE Journal _g17
942			_cARTICULO
100	1		_aNilsen, Halvor M. _952929
100	1		_aLie, K.A. _952930
100	1		_aNatvig, Jostein R. _952931
999			_c187543 _d187543