Method for oil deposit flow state digifax calculating with discrete fracture line processing

Abstract

The invention discloses a method for oil deposit flow state digifax calculating with discrete fracture line processing. First, an oil deposit storage layer is divided into continuous media and discrete fracture media; in order to remove minimum meshes, discrete fracture thicknesses are ignored when oil deposit meshes are established, the section of a discrete fracture on a plane is changed to a line segment, then rock stratum meshes are established, three-dimensional oil deposit meshes are then established; oil deposit parameters such as practical measuring holes, leakage, saturation are recorded into a simulator, wherein real values are used for discrete fracture widths, mesh display values are not used, accuracy of calculating results is not lowered by deformation; the oil deposit parameters are corrected through a history fitting method; then oil well yield, surplus oil-gas distribution and storage amount are calculated. The problems that a discrete fracture numerical simulation technique can be easily interrupted and fail, calculating time is long can be solved, the whole process of practical oil deposit development can be really calculated through the technology, so that accuracy of oil deposit flow state calculating is improved, and accordingly an effective development scheme is formulated to improve oil deposit development effect.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir numerical simulation, and relates to a method for digitally estimating and calculating oil reservoir flow conditions by using discrete fracture line processing, so as to improve the accuracy of oil reservoir numerical simulation for estimating and calculating oil reservoir flow conditions. Background technique [0002] Improving the development effect of the reservoir includes reducing the development cost of the reservoir and increasing the recovery factor of the reservoir. First of all, it is necessary to correctly understand the geological model, seepage law, remaining oil and gas distribution, production law and influencing factors of the reservoir; based on the correct understanding of reservoir geology, that is, the seepage law, a reasonable reservoir development plan can be obtained for scientific and rational development. Oilfields (including gas fields) provide the basis. Reservoir...

AI Technical Summary

Problems solved by technology

Example 1: During water flooding, the continuum method cannot correctly reflect the water conduction effect of large-scale fractures, and cannot correctly reflect the water cut law changes of oil wells. Because of inaccurate measurement and calculation, the distribution of oil and gas is not clear, and the understanding of seepage process is not clear. The developed development plan lacks pertinence, resulting in waste of investment and even deterioration of production status; Example 2: After the oil well is fractured, fractures will be formed. If the fractures are treated with continuous media, the measured production of the oil well will often appear very large. error

Therefore, the traditional continuum method is not suitable for calculating the flow process of all oil reservoirs. The numerical simulation of fractured reservoirs also needs to use the method of discrete fracture media to calculate the flow process of oil and gas.

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