An ultra-low permeability oil and gas reservoir micro-nano pore bubble point pressure numerical simulation method and device

A technology of bubble point pressure and numerical simulation, which is applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as low permeability, complex structure, and large difference in output prediction results, so as to improve the numerical value Effects of simulation accuracy, improved accuracy, and good application prospects

Active Publication Date: 2019-04-09
PETROCHINA CO LTD
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Problems solved by technology

Ultra-low permeability oil and gas reservoirs have micro-nano scale pore throats, complex structures, and extremely low permeability. The PVT phase change of oil and gas in them is differen

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  • An ultra-low permeability oil and gas reservoir micro-nano pore bubble point pressure numerical simulation method and device
  • An ultra-low permeability oil and gas reservoir micro-nano pore bubble point pressure numerical simulation method and device
  • An ultra-low permeability oil and gas reservoir micro-nano pore bubble point pressure numerical simulation method and device

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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0025] In the embodiment of the present invention, the definition of "ultra-low permeability oil and gas reservoirs" is: according to the classification of "Oil and Gas Reservoir Evaluation Method SY-T+6285-1997", the oil and gas reservoirs with reservoir permeability 0.1≤K<1 belong to ultra-low permeability oil and gas reservoirs. Low permeability oil and gas reservoirs.

[0026] The inventors found that the phase state change of oil and gas PVT (pressure, volume, temperature, pressure, volume, temperature) is different from conventional oil and gas reservoirs, and is greatly affected by capil...

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Abstract

The invention provides an ultra-low permeability oil and gas reservoir micro-nano pore bubble point pressure numerical simulation method and device. The method comprises the steps: determining a balance coefficient; Determining a liquid phase compression factor, an escape coefficient and an escape degree according to the balance coefficient, the capillary pressure and the surface tension; According to the balance coefficient, determining and normalizing the gas phase molar fraction; Determining a gas phase compression factor, an escape degree coefficient and an escape degree according to the gas phase mole fraction, capillary pressure and surface tension; Determining a ratio of the liquid phase to the gas phase escape degree according to the liquid phase compression factor, the escape degree coefficient and the escape degree as well as the gas phase compression factor, the escape degree coefficient and the escape degree; And judging the balance condition of the gas phase and liquid phase escape degree according to the ratio, and if the gas phase and liquid phase escape degree are unbalanced, correcting the balance coefficient and the corresponding bubble point pressure until the gas phase and liquid phase escape degree are balanced. According to the technical scheme, the numerical simulation precision of the nano-pore multi-component fluid bubble point pressure of the ultra-lowpermeability oil and gas reservoir is improved, so that the yield prediction precision of the ultra-low permeability oil and gas reservoir is improved.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of tight sandstone oil and gas reservoirs, in particular to a method and device for numerical simulation of micro-nano pore bubble point pressures of ultra-low permeability oil and gas reservoirs. Background technique [0002] At present, the proportion of ultra-low permeability oil and gas reservoir resources in the remaining recoverable resources of low permeability is increasing day by day. Ultra-low permeability oil and gas reservoirs have micro-nano scale pore throats, complex structures, and extremely low permeability. The PVT phase change of oil and gas in them is different from conventional oil and gas reservoirs. Therefore, the production prediction results obtained by conventional multi-component simulation schemes are often It is quite different from the actual situation. Contents of the invention [0003] The embodiment of the present invention provides a method for num...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10G06F2119/06
Inventor 李宁李莉吴淑红
Owner PETROCHINA CO LTD
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