Nonlinear seepage numerical simulation method

A numerical simulation and non-linear technology, applied in CAD numerical modeling, earthwork drilling and production, wellbore/well components, etc., can solve the problem that it is difficult to realize the fully implicit numerical solution method, and the finite difference discretization of the permeability state equation cannot be solved And other issues

Active Publication Date: 2020-04-28
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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The numerical model based on the pseudo-threshold pressure gradient describes the non-Darcy characteristics of the reservoir, which makes up for the deficiency of the numerical simulation method based on Darcy flow to a certain extent; Cheng Shiqing et al. based on the pseudo-threshold pressure gradient motion equation, A mathematical model of oil-water two-phase non-Darcy flow was established; Zhao Guozhong et al. established the non-Darcy equation by assuming t

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  • Nonlinear seepage numerical simulation method
  • Nonlinear seepage numerical simulation method
  • Nonlinear seepage numerical simulation method

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[0107] Natural rock cores with different permeability levels from QHD32-6 oilfield and artificial cemented cores with similar permeability levels to this block were used to study the seepage law. The crude oil and kerosene in Well E28 were mixed as experimental oil, and its viscosity was in line with the actual block formation. oil viscosity. The experiment studied the single-phase seepage law under different crude oil viscosities and different permeability conditions. In order to measure the real start-up pressure gradient more accurately and effectively, this experiment adopts the micro-flow displacement pressure difference experiment method, at room temperature 24 Under the condition of ℃, the formation crude oil and kerosene were mixed to prepare simulated oil with a viscosity of 64.92mPa.s for experiments. The specific parameters of the experimental core were: diameter 2.480cm, length 5.658cm, porosity 34.565, irreducible water saturation 19.08%, The permeability is 100.3...

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Abstract

The invention relates to a nonlinear seepage numerical simulation method. The nonlinear seepage numerical simulation method comprises the following steps: establishing a model; setting assumed conditions, on the premise that the assumed conditions are met, establishing an oil, gas and water three-phase motion equation, and obtaining a rock compression coefficient, an oil, gas and water phase compression coefficient and an oil, gas and water component continuity equation; substituting the motion equation of the oil phase, the gas phase and the water phase into a corresponding continuity equation, and converting into a volume conservation form under a ground standard condition; converting the non-Newtonian fluid motion equation into an expression consisting of apparent viscosity, apparent gradient and flow correction coefficient; and solving the established model to obtain so, sg and sw. The method better conforms to the actual condition of the heavy oil reservoir, the prediction index precision is higher, and the actual condition of the oil reservoir is better met.

Description

technical field [0001] The invention relates to a nonlinear seepage numerical simulation method. Background technique [0002] The particularity of fluid and nonlinear seepage characteristics are two factors restricting the efficient development of heavy oil reservoirs. Establishing a reservoir numerical simulation model considering nonlinear seepage characteristics has important practical significance for the development of heavy oil reservoirs. Currently, the commonly used reservoir numerical simulation methods are all based on Darcy's seepage mathematical model, which cannot accurately and effectively predict the influence of nonlinear seepage characteristics on the production performance of heavy oil reservoirs. Scholars at home and abroad have improved the numerical model to better describe the seepage law of non-Newtonian fluids, mainly including the numerical simulation method based on the pseudo-threshold pressure gradient model and the variable permeability numerica...

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Application Information

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IPC IPC(8): G06F30/20E21B49/08G06F111/10
CPCE21B49/08Y02A10/40
Inventor 石立华党海龙喻高明薛颖贾自力王雨石彬曾俊王继超张亮朱争谢旭强白璞
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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