US 2014/0236559 A1Published application

Systems, methods, and computer-readable media for modeling complex wellbores in field-scale reservoir simulation

AssigneeSaudi Arabian Oil Company

InventorsLarry Siu-Kuen Fung, Xiang Yang Ding

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Abstract

Systems, methods, and computer-readable media are provided for a near-well unstructured grid model builder for generating a full-field unstructured grid for reservoir simulation. As described further below, the near-well unstructured grid model builder may include a workflow interface and a parallel unstructured grid model builder. The inputs to the near-well unstructured grid model builder may include existing well trajectory and completion data, future well data, a geological model, a structured grid simulation model, or any combination thereof. The near-well unstructured grid model builder may output a near-well unstructured grid having a specified grid resolution in regions of interest that include a well.

Claims43

Dependent claims

A computer-implemented method for generating a near-well unstructured grid, the method comprising:

receiving, by one or more processors, input data, the input data comprising:
a structured geocellular model having a well or a structured reservoir simulation model having a well;
and
well trajectory data and completion data for the well;
determining, by one or more processors, a field polygon based on the input data;
determining, by one or more processors, a reservoir polygon having a region of interest containing the well;
generating, by one or more processors, a plurality of grid points, the plurality of grid points comprising:
a plurality of field grid points based on a user-specified field grid size;
and
a plurality of reservoir grid points based on a user-specified reservoir grid size for each reservoir;
a plurality of well grid points based on a well grid size;
and
a plurality of parallel near-wellbore grid points on both sides of each of the plurality of well grid points based on the well grid size;
performing conflicting point removal and point adjustments to generate a plurality of final grid points based on a point prioritization of weights assigned to the plurality of grid points;
performing, by one or more processors, a Delaunay triangulation based on the plurality of final grid points;
generating, by one or more processors, a Voronoi grid based on the Delaunay triangulation;
generating, by one or more processors, a near-well unstructured grid based on the Voronoi grid, the generating comprising:
generating a geometry of the near-well unstructured grid;
generating properties of the near-well unstructured grid;
and
generating perforation of the near-well unstructured grid;
and
providing, by one or more processors, the near-well unstructured grid to a parallel reservoir simulator.

20 more elements

A non-transitory tangible computer-readable storage medium having executable computer code stored thereon, the computer code comprising a set of instructions that causes one or more processors to perform the following:

receiving, by one or more processors, input data, the input data comprising:
a structured geocellular model or a structured reservoir simulation model having a well;
and
well trajectory data and completion data for the well;
determining, by one or more processors, a field polygon based on the input data;
determining, by one or more processors, a reservoir polygon having a region of interest containing the well;
generating, by one or more processors, a plurality of grid points, the plurality of grid points comprising:
a plurality of field grid points based on a user-specified field grid size;
a plurality of reservoir grid points based on a user-specified reservoir grid size for each reservoir;
a plurality of well grid points based on a well grid size;
and
a plurality of parallel near-wellbore grid points on both sides of each of the plurality of well grid points based on the well grid size;
performing conflicting point removal and point adjustments to produce a plurality of final grid points based on a point prioritization of weights assigned to the plurality of grid points;
performing, by one or more processors, a Delaunay triangulation based on the plurality of final grid points:
generating, by one or more processors, a Voronoi grid based on the Delaunay triangulation;
generating, by one or more processors, a near-well unstructured grid model based on the Voronoi grid, the generating comprising:
generating a geometry of the near-well unstructured grid model;
generating properties of the near-well unstructured grid model;
and
generating perforation of the near-well unstructured grid model;
and
providing, by one or more processors, the near-well unstructured grid to a parallel reservoir simulator.

19 more elements

A system, comprising:

one or more processors;
a non-transitory tangible computer-readable memory having executable computer code stored thereon, the computer code comprising a set of instructions that causes one or more processors to perform the following:
receiving, by the one or more processors, input data, the input data comprising:
a structured geocellular model having a well or a structured reservoir simulation model having a well;
and
well trajectory data and completion data for the well;
and
determining, by the one or more processors, a reservoir polygon having a region of interest containing the well;
generating, by one or more processors, a plurality of grid points, the plurality of grid points comprising:
a plurality of field grid points based on a user-specified field grid size;
a plurality of reservoir grid points based on a user-specified reservoir grid size for each reservoir;
a plurality of well grid points based on a well grid size;
and
a plurality of parallel near-wellbore grid points on both sides of each of the plurality of well grid points based on the well grid size;
performing conflicting point removal and point adjustments to produce a plurality of final grid points based on a point prioritization of weights assigned to the plurality of grid points;
performing, by the one or more processors, a Delaunay triangulation based on the plurality of final grid points:
generating, by the one or more processors, a Voronoi grid based on the Delaunay triangulation;
generating, by the one or more processors, a near-well unstructured grid based on the Voronoi grid, the generating comprising:
generating a geometry of the near-well unstructured grid;
generating properties of the near-well unstructured grid;
and
generating a perforation of the near-well unstructured grid;
and
providing, over a network coupled to the one or more processors, the near-well unstructured grid to a parallel reservoir simulator.

21 more elements

Dependencies are inferred from the claim text.