Grid partitioning method and system

A grid division and grid technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of long computing time, large number of grids, and low computing efficiency.

Inactive Publication Date: 2011-11-16
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] With the existing PEBI grid division method, when the well is near the boundary or fault, the grid division is often unsuccessful, and multiple parameter adjust

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Embodiment Construction

[0089] The inventor found through research that at present, PEBI unstructured grids and triangular grids are used for grid division. When performing grid division, the selected grid scale is a uniform grid scale, which leads to an increase in the number of grids. It further leads to low calculation efficiency and long calculation time.

[0090] In order to solve the above-mentioned problems, the embodiment of the present invention discloses a grid division method. When arranging points for independent regions, the points are arranged according to radial rules. Among them: the radial law is based on the distance value to the well point in the independent area, increasing the grid scale, the grid scale increase value of the adjacent point gradually increases, and the grid scale of the point with the same distance value to the well point in the independent area same. That is, when arranging points in independent areas, gradually increasing grid scales are used for arranging poin...

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Abstract

The invention discloses a grid partitioning method which comprises the following steps: partitioning a point module and a linear module, and distributing points in the point module and the linear module; partitioning a horizontal two-dimensional plane into at least one independent region, and carrying out point distribution on the independent region according to a radial distributing rule; removing mutually-overlapped points; partitioning the points so as to obtain grids; after invalid grids are deleted, setting all the remaining grids as two-dimensional variable PEBI (perpendicular bisection) unstructured grids; and carrying out vertical expansion on each grid until the expanded grids are three-dimensional variable PEBI (perpendicular bisection) unstructured grids. By applying the schemedisclosed by the invention, when point distribution is carried out on the independent region, the point distribution is implemented according to the radial distributing rule, and the radial distributing rule is as follows: according to the value of distance between a distributed point and a well point in the independent region, the grid scale of the distributed point is increased, then the added value of the grid scale of a point adjacent to the distributed point is gradually increased, and the grid scales of the points (the distances between the points and the well point in the independent region are same) are same. Through using the point distribution mode, the number of the points in the independent region is reduced; and when grid partitioning is carried out on the points, the number of the grids is reduced, the calculation efficiency is improved, the calculation time is shortened, and the user burden is reduced.

Description

technical field [0001] The invention relates to the technical field of numerical well testing analysis, and more particularly, to a grid dividing method and system. Background technique [0002] One of the applications of numerical simulation technology for bottom hole transient pressure of oil and gas wells is to conduct well test analysis of bottom hole pressure, and well test analysis is an important analysis method for understanding oil reservoirs, evaluating reservoirs and monitoring production performance. Well test analysis technology can be divided into analytical well test analysis method and numerical well test analysis method according to the method of solving the seepage equation. [0003] The most important step in the numerical well testing method is grid division. The number and distribution of the divided networks directly affect the calculation efficiency, calculation accuracy and calculation time of the reservoir numerical simulation; and the adaptability a...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 查文舒李道伦卢德唐张龙军
Owner UNIV OF SCI & TECH OF CHINA
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