A Calculation Method of Unsteady Two-phase Relative Permeability Based on Pore Network Model
A pore network model and relative permeability technology, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as inability to accurately guide oil and gas reservoir development, unclear seepage laws, and biased accuracy.
Active Publication Date: 2022-02-15
SOUTHWEST PETROLEUM UNIV
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[0003] At present, many researchers at home and abroad usually use the continuum theory to study multiphase seepage in porous media. However, due to the discontinuity of viscous force and capillary force on the pore scale, and how the seepage law changes after considering fractured media is still unclear. ; The actual fluid usually has compressibility (especially gas) inside the reservoir, which is contrary to the steady-state seepage theory that the fluid can pass from the inlet to the outlet instantaneously; in the actual production situation, the seepage law of multiphase fluid is extremely complicated, conventional The advanced seepage theory cannot accurately guide the development of oil and gas reservoirs and predict its production performance, and the current simulation research methods for unsteady two-phase seepage still have certain limitations. Conventional commercial numerical simulation software can roughly simulate two-phase seepage process, but the drawn relative permeability curves are often biased from the actual accuracy, which greatly limits the exploitation of oil and gas resources
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[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. Unless otherwise defined, the technical terms or scientific terms used in the disclosure of the present invention shall have the usual meanings understood by those skilled in the art to which the disclosure belongs. The disclosure of the present invention uses "comprising" or "comprises" and other similar words to mean that the elements or objects appearing before the words include the elements or objects listed after the words and their equivalents, without excluding other elements or objects.
[0063] A method for calculating relative permeability of two phases in an unsteady state based on a pore network model, comprising the following steps:
[0064] S1: Calculation of flu...
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The invention discloses a method for calculating the unsteady two-phase relative permeability based on a pore network model, which comprises the following steps: on the basis of the pore network model, the fluid flow and pressure are calculated through the unsteady seepage equation; according to the calculation, the The relative permeability of the two phases in the unsteady state is calculated according to the fluid flow and pressure of the relative permeability calculation formula; according to the relative permeability data of the two phases at different water saturations during the displacement process, the relative permeability of the two phases is plotted curve. The invention can calculate the relative permeability that is more in line with the physical characteristics of the reservoir, draw the two-phase relative permeability curve, and provide accurate technical guidance for the development of oil and gas reservoirs.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an unsteady two-phase relative permeability calculation method based on a pore network model. Background technique [0002] Oil and gas resources are one of the most used and most important energy sources in the world. How to develop oil and gas resources efficiently and rationally is a difficult problem faced by every reservoir engineer. Two-phase (oil-water two-phase, gas-water two-phase) relative permeability curves are very important basic data in oil and gas field development engineering. The methods for obtaining such data often include experimental methods and numerical simulation methods. Each method has its own advantages and disadvantages . The experimental methods include the commonly used steady-state method and unsteady-state method. The unsteady-state method is boring and difficult, and takes a long time. Although the unsteady-state method (co...
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IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 唐雁冰杨鑫李闽
Owner SOUTHWEST PETROLEUM UNIV