Method for calculating secondary migration rate of crude oil driven by overpressure

A calculation method and technology of crude oil, applied in the field of geological exploration, can solve the problem that it is impossible to calculate the secondary migration rate of crude oil driven by overpressure

Inactive Publication Date: 2015-09-23
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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Problems solved by technology

[0003] The invention provides a method for calculating the secondary migration rate of crude oil driven by overpressure, which solves or part

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  • Method for calculating secondary migration rate of crude oil driven by overpressure
  • Method for calculating secondary migration rate of crude oil driven by overpressure
  • Method for calculating secondary migration rate of crude oil driven by overpressure

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Embodiment Construction

[0096] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, below in conjunction with the accompanying drawings and preferred embodiments, the specific implementation of the calculation method for the secondary migration rate of crude oil under the overpressure drive proposed by the present invention The method and working principle are described in detail.

[0097]Before describing the method provided by the embodiment of the present invention, it is necessary to explain the driving mechanism of the secondary migration of crude oil in the overpressure reservoir (porous medium):

[0098] The driving forces and resistances that promote the secondary migration of oil and gas include: buoyancy, hydrodynamic force, gravity and capillary pressure. According to existing studies, in the overpressure zone, the hydrocarbons discharged from the source rock enter the water-saturated reservoir, under the con...

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Abstract

The invention relates to the technical field of geological prospecting and discloses a method for calculating secondary migration rate of crude oil driven by overpressure. The method includes: acquiring an overpressure driven fluid flowing basic equation through a continuity equation, a Darcy law, a fluid potential expression and a formation fluid physical property relation, and converting the basic equation into an oil-water two-phase flowing equation by taking capillary pressure and oil-water saturation degree into consideration; discretizing the flowing equation through a finite difference explicit format method to acquire an explicit expression; solving the explicit expression to acquire hole pressure, and calculating on the basis of the hole pressure to acquire the secondary migration rate of the crude oil driven by overpressure. The secondary migration rate of the crude oil driven by overpressure in an overpressure reservoir is calculated by combining flowing characteristics and physical property characteristics of fluid in the overpressure reservoir through geological modeling, mathematical deduction and solving, migration distance of overpressure driven oil gas and crude oil distribution range can be acquired further, and a scientific basis is provided for geological evaluation and exploration of oil gas and finding of new oil gas reserves.

Description

technical field [0001] The invention relates to the technical field of geological exploration, and mainly relates to a method for calculating the secondary migration rate of crude oil driven by overpressure. Background technique [0002] Formation pressure is an extremely important factor affecting the migration and accumulation of underground oil and gas, and abnormal high pressure (overpressure) is closely related to oil and gas migration and accumulation. At present, most of the studies on the relationship between abnormal high pressure and oil and gas migration and accumulation at home and abroad give directions and qualitative explanations for oil and gas migration simply from the characteristics of fluid potential. In addition, some scholars have calculated the oil and gas migration and accumulation efficiency through buoyancy-driven modeling. Due to the particularity of oil and gas reservoirs with overpressure and the complexity of research, there is no calculation m...

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Application Information

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IPC IPC(8): E21B49/00
Inventor 何生任克雄唐仲华宋国奇王永诗郝雪峰刘宇坤
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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