... the experimental permeability data of the naturally fractured porous sandstone and shale formations based on the theoretically sound modified power-law equation. The critical effective stress and temperature values are determined at the slope discontinuity observed in the variation of the parameters...

... be discontinuous for BHPs. To avoid this problem, we built a continuously differentiable proxy function for NPV using least-square support vector regression (LS-SVR). We use linear equality constraints so that the sums of the lengths of the cycles at each producer and injector are equal to the life...

...Jiawei Li; Yongzan Liu; Kan Wu Summary The 2D displacement discontinuity method (DDM) has been widely used to characterize the hydraulic fracture geometry and the induced in-situ stresses in the oil and gas industry owing to its simplicity and accuracy. As smaller fracture spacing is used...

.... Discontinuities in flux calculations caused by phase labeling problems not only cause serious convergence and stability problems but also affect the estimated recovery factor owing to incorrect phase mobilities. We developed a fully compositional simulation model using an equation of state (EoS) for relative...

... thermal mechanical interaction numerical model Reservoir Characterization strength vaporization rock sample thermal-expansion coefficient thermal property cohesive strength Upstream Oil & Gas discontinuity perforation Drilling interaction thermal conductivity Laser mechanical damage...

... of BPs. In this model, a fully 3D displacement–discontinuity method (3D DDM) is used to model the rock deformation. The advantage of this approach is that it addresses both the mechanical interaction between hydraulic fractures and weak BPs in 3D space and the physical mechanism of slippage along weak...

... discontinuity wellbore pressure reservoir inj co 2 Reynolds falloff test contact discontinuity machine learning june 2018 equation rarefaction wave In this paper, we focus on the development of an approximate analytical solution to calculate wellbore pressure during CWI/falloff tests in an oil...

..., a thermal fluid-flow simulator was one-way coupled to a wave-propagation simulator (information passed is density alone) to evaluate the potential of identifying rock and fluid discontinuities during a SAGD operation with coded white-noise-reflection processes. Digital communication systems use coded white...

... clusters to be used and the space between them significantly impact how effectively the fractures can be created in the formation. To optimize the spacing of perforation clusters, stress distributions and fracture mechanics need to be well understood. In this study, the displacement-discontinuity method...

... Engineers Artificial Intelligence Fluid Dynamics mesh flow in porous media concentration discontinuity Upstream Oil & Gas discrete-fracture model black-oil model Trangenstein fracture matrix University reservoir simulation matthai producer june 2009 equation complex reservoir...

... permeability discontinuity three-phase flow artificial intelligence fluid dynamics upstream oil & gas saturation triangle experiment strict hyperbolicity saturation september 2004 permeability riemann problem hyperbolicity Three immiscible fluids—water, oil, and gas—may flow in many...

... pore pressure gas reservoir upstream oil & gas stability function principal stress reservoir natural fracture weakness plane hydraulic fracture coordinate system microseismic activity plane discontinuity liquid-saturated reservoir shear stress fracture pressure distribution...

... discontinuity water saturation reservoir relative permeability pressure transient testing injection water-invaded region derivative plot falloff period injection period drillstem/well testing water injection sequence drillstem testing saturation regime waterflooding coefficient water...

... algorithm. The solution method allows continuous variation as well as discontinuities of the rock and fluid properties. The new solution algorithm reproduces all known exact solutions for specific variation of properties including the multi-composite radial and linear model solutions. 1 11 1995 14...

..., involving a frequency-based representation of data, usually assume stationarity. These methods, therefore, extract only average information and, hence, are not suitable for analyzing data with isolated or deterministic discontinuities, such as faults or fractures in reservoir rocks or image edges...

...M. A. Vegas-Landeau; Rick Propp; T. W. Patzek; Phillip Colella Summary This paper presents a novel numerical algorithm for computing incompressible, discontinuous, two-phase flows in two-dimensional (2D), inhomogeneous, and isotropic porous media. The algorithm uses Bell et al .'s hybrid sequential...

...Chih-Cheng Chen; Rajagopal Raghavan A simple, yet effective and remarkable, procedure is devised to incorporate the existence of discontinuities such as the Heaviside unit function in the construction of inverse transforms by the Stehfest algorithm. This generic method may be used to overcome...

... or a constant pressure circle. Two cases were considered, with the well located either inside or outside the circular discontinuity. When the well is located inside the circular subregion, the solution developed in the study is also a generalization of the well-known pressure response for a composite two-region...

... models. bubble-point problem discontinuous variable oil particle capillary pressure upstream oil & gas black-oil model enhanced recovery reservoir simulation shock generation gas phase saturation curve conservation law spe journal mechanism bifurcation mechanism saturation...