A Calculation Method of Crude Oil Secondary Migration Rate 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: 2018-04-17
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 partially solves the technical problem in the prior art that the secondary migration rate of crude oil driven by overpressure cannot be calculated
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[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 cond...
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The invention relates to the technical field of geological exploration, and discloses a calculation method for the secondary migration rate of crude oil driven by overpressure, which includes: obtaining the overpressure through the continuity equation, Darcy's law, fluid potential expression and formation fluid physical property relationship Drive the basic equation of fluid flow, consider the capillary pressure and oil-water saturation, transform the basic equation into an oil-water two-phase flow equation; discretize the flow equation by the finite difference explicit scheme method, and obtain an explicit expression; The pore pressure is obtained by solving the expression, and the secondary migration rate of crude oil driven by overpressure is calculated based on the pore pressure. The present invention combines the characteristics of fluid flow and physical properties in overpressure reservoirs, and through geological modeling, mathematical derivation and solution, calculates the secondary migration rate of crude oil driven by overpressure in overpressure reservoirs, and can further obtain the overpressure-driven oil and gas migration rate. The migration distance and crude oil distribution range provide scientific basis for oil and gas geological evaluation and exploration, as well as the discovery of new oil and 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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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)