Stress sensitive reservoir stratum relative permeability calculation method based on fractal theory

A relative permeability and stress-sensitivity technology, applied in the field of relative permeability calculation of stress-sensitive reservoirs based on fractal theory, can solve problems such as inability to reflect stress sensitivity, and achieve the effect of reducing coring and experiment expenses

Active Publication Date: 2015-08-12
CHENGDU NORTH OIL EXPLORATION DEV TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for calculating relative permeability of stress-sensitive reservoirs based on fractal theory, to solve the problem ...

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  • Stress sensitive reservoir stratum relative permeability calculation method based on fractal theory
  • Stress sensitive reservoir stratum relative permeability calculation method based on fractal theory
  • Stress sensitive reservoir stratum relative permeability calculation method based on fractal theory

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Embodiment

[0030] Such as figure 1 Shown flow chart of the present invention, taking the detection signal of certain oil field as example, the relative permeability curve that utilizes the method of the present invention and the method that the relative permeability curve in the prior art obtains is carried out comparative experiment, the relative permeability curve that obtains is as follows Figure 2 to Figure 7 ;

[0031] And same data, carry out following operation according to the step of the inventive method:

[0032] (a) First use the experimental data to establish a stress-sensitive dynamic change model of reservoir permeability;

[0033] (b1) Calculation of water cut using oilfield production data , the average saturation of the reservoir and the tortuosity of formation water in porous media ;

[0034] (b2) Using oil-water viscosity , , combined with moisture content and tortuosity Calculate the fractal dimension

[0035]

[0036] ;

[0037] (b3) Using ...

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Abstract

The invention discloses a stress sensitive reservoir stratum relative permeability calculation method based on a fractal theory. The stress sensitive reservoir stratum relative permeability calculation method comprises the following steps: firstly, establishing a reservoir stratum permeability dynamic change model with stress sensitivity by using experimental data; and secondly, substituting the reservoir stratum permeability dynamic change model into a fractal theory model and inducing a relative permeability curve considering the reservoir stratum stress sensitivity. The stress sensitive reservoir stratum relative permeability calculation method can be used for a loose sandstone oil and gas reservoir with a smaller burying depth and difficulty in coring, and also can be widely applied to an oil and gas reservoir stratum with the stress sensitivity; and a relative permeability experiment is replaced and the coring and experimental expenditures are reduced.

Description

technical field [0001] The invention relates to the technical field of data analysis of reservoir engineering, in particular to a method for calculating relative permeability of stress-sensitive reservoirs based on fractal theory. Background technique [0002] During the production of oil and gas reservoirs with stress-sensitive reservoirs, as the formation pressure decreases, the confining pressure on the reservoir rocks gradually increases. Especially for reservoirs with relatively loose lithology, the microscopic pore throat structure of the medium will occur. Deformation leads to changes in reservoir permeability and porosity, and this change will inevitably affect the fluidity of oil, gas, water and other fluids in the reservoir, that is, the relative permeability of oil, gas and water changes. Conventional fractal theory and mathematical models are used to calculate The stress sensitivity cannot be reflected in the process, so it is difficult to effectively obtain the ...

Claims

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Application Information

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IPC IPC(8): G06F19/00E21B49/00
Inventor 卢立泽邓勇瞿祥云司继伟何巍康博王贺华徐兵张艺久米中荣周长江张博杨鸿杨滔罗春树马成袁浩何冰范海亮桂碧雯符奇杜新龙蒋利平臧克一黄海平黄凯孙照磊曹剑张小平
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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