Numerical simulation method considering oil reservoir parameter time variant

Abstract

The invention provides a numerical simulation method considering oil reservoir parameter time variant. The numerical simulation method comprises the steps of step 1, establishing an oil reservoir numerical simulation model, and obtaining a group of new data fields in water injecting and washing times according to attribute parameters of each grid block in the oil reservoir numerical simulation module during each iterative computation process of oil reservoir numerical simulation through computing; step 2, establishing a variation relation model that the reservoir permeability varies with the change of the water injecting and washing times, and correcting a dynamic variation range of static parameters of the oil reservoir numerical simulation model during the iterative computation process all the time; step 3, computing a time variant rule of relative permeability curves based on the change of physical property, and describing a relative permeability curve of each grid in iterative computation; step 4, computing an oil and water movement rule in each iterative time step after the relative permeability curve is obtained. The numerical simulation method considering the oil reservoir parameter time variant, provided by the invention, has the characteristics that the principle is simple, the description is more accurate, the operability is strong, and the like, and thus a very good promotion and application value can be obtained.

Description

technical field [0001] The invention relates to the application of oil reservoir numerical simulation and the field of oil and gas field development to enhance oil recovery, in particular to a numerical simulation method considering time-varying oil reservoir parameters. Background technique [0002] For multi-layer sandstone monolithic reservoirs deposited in continental facies, the reservoir heterogeneity is serious, the vertical and horizontal contradictions are prominent, and the distribution of remaining oil is complicated. The current heterogeneity of the reservoir and the seepage law of the fluid have changed greatly with the flushing of water injection. Numerical simulation research on conventional reservoirs Reservoir simulation has been recognized by the industry as a standard technology for reservoir engineering research and management. Oil distribution rules, research on remaining oil potential tapping measures, development plan prediction and optimization resea...

AI Technical Summary

Problems solved by technology

However, the conventional numerical simulation method does not reflect the changes in reservoir parameters and seepage laws under the characteristic conditions of high injection multiples, so it cannot accurately and quantitatively characterize the distribution of remaining oil in strong water injection scoured reservoirs, which directly affects the greatly improved ultimate recovery of reservoirs in oilfields rate accuracy

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