Generation of Hybrid Grids for Simulation of Complex, Unstructured Reservoirs by a Simulator with MPFA

Brewer, Michael L.; Camilleri, D.; Ward, S.; Wong, Terry

doi:10.2118/173191-ms

Cited by 27 publications

(1 citation statement)

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“…When we are talking about Complex Fracture Networks (CFN) within the reservoir, then advanced reservoir gridding tools are required to realistically simulate well productivity. For the most simple case, orthogonal fracture systems can be modeled using highly refined orthogonal grid systems, but when real data from image logs and microseismic come into play and the created fractures are not orthogonal, then highly refined unstructured gridding [16] is required to realistically simulate production in this environment. An example of such a reservoir model is shown in Fig.…”

Section: Coupling Of Fracture and Reservoir Simulation For Fracture Design Optimizationmentioning

confidence: 99%

Shale Reservoir-Centric Completions

Spaid¹,

Dahl²,

Dusterhoft³

et al. 2016

TOPEJ

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In North America, the transition from more conventional reservoirs into tight, basin-centered gas and now source shales has caused the industry to change the way reservoir performance is being assessed, measured, and documented. Historically in conventional reservoirs the reservoir quality was carefully examined on a well by well basis to determine reserves in place and exploitation plans. For unconventional reservoirs, however, the commercializing of such plays quickly became centered on horizontal drilling of long laterals combined with massive volume, high rate multi-stage hydraulic fracturing. In that environment, completion design and hydraulic fracturing have become more of a statistical process; additionally, incremental improvement and innovation are used to create a treatment schedule often replicated across an entire field without consideration of reservoir variability across a lateral. Based upon vertical well experience, the fracture initiation points can be carefully selected by identifying the locations within the well that are best to perforate. In a horizontal well, however, the location of the lateral defines the fracture initiation points anywhere along the well, so the stratigraphic location of the well lateral becomes critical in non-homogeneous shale plays. To address this, engineers and geoscientists can identify important parameters necessary for optimum completion design, and earth modelling can then be used as a tool to capture and model these properties across the asset making critical information available as needed for drilling, completion, and production operations.

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Section: Coupling Of Fracture and Reservoir Simulation For Fracture Design Optimizationmentioning

confidence: 99%

Shale Reservoir-Centric Completions

Spaid¹,

Dahl²,

Dusterhoft³

et al. 2016

TOPEJ

View full text Add to dashboard Cite

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Unstructured Voronoi grids conforming to lower dimensional objects

2018

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A fractured poroelastic body is considered where the opening of the fractures is governed by a nonpenetration law while slip is described by a Coulomb-type friction law. This physical model results in a nonlinear variational inequality problem. The variational inequality is rewritten as a complementary function, and a semismooth Newton method is used to solve the system of equations. For the discretization, we use a hybrid scheme where the displacements are given in terms of degrees of freedom per element, and an additional Lagrange multiplier representing the traction is added on the fracture faces. The novelty of our method comes from combining the Lagrange multiplier from the hybrid scheme with a finite volume discretization of the poroelastic Biot equation, which allows us to directly impose the inequality constraints on each subface. The convergence of the method is studied for several challenging geometries in 2d and 3d, showing that the convergence rates of the finite volume scheme do not deteriorate when it is coupled to the Lagrange multipliers. Our method is especially attractive for the poroelastic problem because it allows for a straightforward coupling between the matrix deformation, contact conditions, and fluid pressure.

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