Adaptive Grid Point Distribution for Fluid Flow Simulation

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Solution Overview

Problem

Current fluid flow simulation techniques in well systems face challenges in accurately and efficiently modeling complex, unsteady, multi-dimensional fluid flows, particularly in subterranean environments, due to limitations in grid point distribution and computational efficiency.

Innovation Solution

The use of a geometric series-based distribution of grid points, generated using Newton's method, to create a smooth and adaptive mesh that clusters points of interest, improving simulation accuracy and reducing computational costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a uniform distribution of grid points is used in fluid flow simulation, then the computational domain is easily covered, but the simulation accuracy around points of interest (such as perforations) is insufficient

Engineering Contradiction:
Improvesimulation accuracyVSAvoidgrid distribution complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by transitioning from a uniform grid distribution to a non-uniform distribution where grid point spacing varies locally based on proximity to points of interest. The grid point spacing is reduced near perforations and other critical locations while maintaining larger spacing in less critical regions, thereby concentrating computational resources where they are most needed for accuracy without uniformly increasing complexity across the entire domain.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the grid distribution adaptive rather than static. The grid point spacing is dynamically adjusted based on the local flow conditions and proximity to points of interest, allowing the simulation to automatically refine the mesh in regions where higher accuracy is required while coarsening it elsewhere, thus resolving the contradiction between accuracy and complexity.

Inventive Principle:
Principle #15Dynamics

2Measurement precision

If grid points are clustered around points of interest to improve accuracy, then simulation precision increases, but computational cost increases

Engineering Contradiction:
Improvesimulation accuracyVSAvoidcomputational resources
Core Design Contradiction:
Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies local quality by concentrating grid points only in specific regions around points of interest such as perforations and fracture intersections, rather than uniformly distributing them throughout the entire domain. This localized clustering achieves high simulation accuracy at critical locations while maintaining a coarser grid in less critical regions, thereby reducing the total number of grid points and computational resources required compared to a uniformly fine grid.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent applies partial action by implementing grid point clustering only where necessary (at points of interest) rather than across the entire domain. This selective refinement achieves the necessary accuracy for critical regions without the excessive computational cost of a uniformly fine grid throughout, thus resolving the contradiction between accuracy and computational resources.

Inventive Principle:
Principle #16Partial or excessive action

3Measurement precision

If a fine mesh is used to capture detailed fluid flow behavior, then simulation accuracy improves, but computational efficiency decreases

Engineering Contradiction:
Improvesimulation accuracyVSAvoidcomputational efficiency
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent applies local quality by using a fine mesh only in specific regions where detailed fluid flow behavior is critical (near perforations, fracture intersections, and other points of interest) while using a coarser mesh in less critical regions. This localized refinement captures essential flow details where needed without the computational overhead of a uniformly fine mesh across the entire domain, thus resolving the contradiction between accuracy and computational efficiency.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent applies segmentation by dividing the computational domain into regions of different mesh densities - fine mesh regions around points of interest and coarser mesh regions elsewhere. This segmented approach allows the simulation to capture detailed flow behavior where necessary while maintaining computational efficiency in less critical areas, effectively resolving the accuracy-efficiency trade-off.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS9576084B2Generating a smooth grid for simulating fluid flow in a well system environment
Publication Date: 2017.02.21 HALLIBURTON ENERGY SERVICES INC
  • US9576084B2 patent drawing
  • US9576084B2 patent drawing
  • US9576084B2 patent drawing

AI summary

In some aspects, a grid-point-spacing ratio is computed for a one-dimensional fluid flow model. The one-dimensional fluid flow model represents a flow path for well system fluid in a subterranean region, and the grid-point-spacing ratio is computed based on a parameter of the flow path. Grid points for the one-dimensional flow model are generated based on the grid-point-spacing ratio.