Unsteady two-phase relative permeability calculation method based on pore network model
A pore network model and relative permeability technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as unclear seepage law, inability to accurately guide oil and gas reservoir development, and biased accuracy
Active Publication Date: 2021-01-01
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 drawings and embodiments. It should be noted that the embodiments in this application and the technical features in the embodiments can be combined with each other if there is no conflict. 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 with ordinary skills in the field to which this disclosure belongs. The use of "includes" or "includes" and other similar words used in the present disclosure means that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, but do not exclude other elements Or objects.
[0063]A method for calculating the relative permeability of two phases in an unsteady state based on a pore network model, including the following steps:
[0064]S1: Calculate fluid flow and pressure through the unsteady se...
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The invention discloses an unsteady two-phase relative permeability calculation method based on a pore network model, and the method comprises the following steps: calculating the flow and pressure ofa fluid through an unsteady seepage equation on the basis of the pore network model; according to the fluid flow and pressure obtained through calculation, in combination with a relative permeabilitycalculation formula, obtaining the unsteady two-phase relative permeability through calculation; and drawing a two-phase relative permeability curve according to the two-phase relative permeability data under different water saturations in the displacement process. According to the method, the relative permeability more conforming to the reservoir physical property characteristics can be calculated, the two-phase relative permeability curve is drawn according to the relative permeability, and accurate technical guidance is provided for oil and gas reservoir development.
Description
Technical field[0001]The invention relates to the technical field of oil and gas field development, in particular to a method for calculating unsteady two-phase relative permeability 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 efficiently and rationally develop oil and gas resources 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 projects. The methods to obtain this type of data often include experimental methods and numerical simulation methods, and each method has its own advantages and disadvantages. . The experimental methods include the commonly used steady-state method and the non-steady-state method. The non-steady-state method is boring, difficult and time-consuming. Although the non-steady-state method (common...
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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