Oil and gas reservoir numerical simulation calculation method
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A technology of numerical simulation and calculation method, applied in the direction of calculation, electrical digital data processing, special data processing application, etc., can solve the problems of non-convergence of calculation, poor calculation stability, long calculation time, etc.
Inactive Publication Date: 2013-08-14
CHINA UNIV OF PETROLEUM (BEIJING)
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[0005] The main purpose of the embodiments of the present invention is to provide a numerical simulation calculation method for oil and gas reservoirs to solve the problems caused by the heterogeneity of the reservoir geological model, the severe phase change of the fluid, the large difference in the flow capacity of each phase, and the unreasonable production system during the simulation calculation process. Serious calculation non-convergence phenomenon, poor calculation stability, long calculation time and other problems caused by factors such as
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Embodiment 1
[0022] This embodiment provides a numerical simulation calculation method for oil and gas reservoirs, such as figure 1 As shown, the method includes:
[0023] Step S101, solving the oil phase pressure, water phase pressure, and gas phase pressure at each moment of the simulation process after the spatial discretization.
[0024] This step is divided into the following four processes:
[0025] Process 1, establishing the pressure equation in the linear difference equation, that is, according to the existing IMPES method, the conventional linear difference equations are eliminated and simplified, and the water saturation difference δS after the spatial discretization is eliminated w and gas saturation difference δS g After that, the oil-phase pressure difference δp after only including the variable space discretization is obtained o the equation;
[0026] Among them, δS w = S w n+1 -S w n ;S w n+1 , S w n are the water saturation at the n+1th moment and the nth mome...
Embodiment 2
[0067] This example takes the calculation process of a polymer-microgel flooding numerical simulation software (hereinafter referred to as POLY software) as an example to introduce in detail the application of the oil and gas reservoir numerical simulation calculation method provided in Example 1. The POLY software is based on the example 1. The numerical simulation calculation method of the oil and gas reservoir provided is the calculation principle.
[0068] Such as figure 2 As shown, the calculation process of POLY software is as follows:
[0069] Step S201, the program is started, and the memory environment required for program operation is established;
[0070] Step S202, input the number of grids in different directions, the width, thickness, permeability, and porosity data of each grid required for numerical simulation;
[0071] Step S203, input the oil-gas-water viscosity, dissolved gas-oil ratio, volume coefficient, and phase permeability parameters required for nu...
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Abstract
The invention provides an oil and gas reservoir numerical simulation calculation method. The method includes calculating oil phase pressure, water phase pressure and gas phase pressure of a spatial dispersion post simulation process at any moment, calculating total volume flow of fluid in the flowing direction according to the oil phase pressure, water phase pressure and gas phase pressure of the spatial dispersion post simulation process at any moment, calculating oil saturation, gas saturation and water saturation according to the total volume flow of the fluid in the flowing direction and correcting the oil saturation, the gas saturation and the water saturation according to the substance conservation principle. In the method, the pressure is calculated in one step, the speed is calculated in one step, and branch flow and saturation are calculated in multiple steps, velocity item calculation is introduced, and calculation misconvergence caused by factors such as anisotropy, fluid phase change and unreasonable production systems is avoided. The numerical simulation stability is better, the convergence condition is easy to judge, and the method is suitable to be applied when a common oil and gas reservoir numerical simulation method sinks into misconvergence.
Description
technical field [0001] The invention relates to the field of numerical simulation calculations, in particular to a method for numerical simulation calculations of oil and gas reservoirs. Background technique [0002] Numerical simulation calculations are widely used in the formulation of oilfield development adjustment plans and the prediction of development effects. Commonly used numerical simulation calculation methods mainly include implicit calculation of pressure, explicit calculation of saturation (IMPES) method, implicit alternate solution (IMPIMS) method, semi-implicit and full-implicit methods, among which, IMPES and IMPIMS methods belong to sequential solutions . [0003] At present, most of the major oilfields in eastern my country have entered a high water cut period, and chemical flooding technologies such as polymer flooding, movable gel, and composite flooding have begun to be widely used in mine fields. A series of CO 2 flooding, CO 2 Field tests of gas fl...
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