Dynamic analyzing method for shallow ultra-low permeability sandstone reservoir water-filling development

Abstract

The invention provides a dynamic analyzing method for shallow ultra-low permeability sandstone reservoir water-filling development. The method comprises: normalizing all oil-and-water relative permeability curves of an oilfield development horizon to obtain an oil-and-water relative permeability curve that could represent an entire oilfield; through the use of the oil-and-water relative permeability curve, obtaining a B-type waterflooding characteristic curve; using the accumulated oil production amount and the accumulated water amount of the previous exploitation periods to predict the waterflooding geological reserves; based on the waterflooding characteristic curve and according to the accumulated oil production amount, the accumulated water amount and the waterflooding geological reserves, predicting the exploitable reserves and the exploitation rate; based on an indoors started pressure gradient experiment, fitting the relationship of the started pressure gradients under different permeability rates; and using the waterflooding characteristic curve coefficients, the accumulated oil production amount coefficients, the accumulated oil production amount, and the started pressure gradients to predict the future dynamic state of an oil reservoir. According to the invention, oil-and-water relative permeability curves are used to calculate the waterflooding characteristic curve in combination with the influence of the started pressure gradients on the parameters, making the method suitable for the dynamic analyzing of shallow ultra-low permeability sandstone reservoir water-filling development.

Description

technical field [0001] The invention belongs to a method or equipment for exploiting oil, gas, water, soluble or meltable substances or mineral mud in wells, and in particular relates to a dynamic analysis method for water injection development of shallow ultra-low permeability sandstone reservoirs. Background technique [0002] With the rapid growth of global oil demand, the objects of oil and gas exploration and development are becoming more and more complex, and the grade of reserves is getting worse and worse. Shallow ultra-low permeability sandstone reservoirs will become a major problem in the development of my country's oilfields in the future. There are many problems encountered in the waterflooding development of shallow ultra-low permeability sandstone reservoirs, the most prominent ones are that matrix seepage is difficult, interlayer fractures are easy to occur during waterflooding, and the development effect is poor. [0003] At present, there is no relatively c...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the current inaccurate prediction in the field of reservoir engineering dynamic analysis for shallow ultra-low permeability sandstone reservoirs, and to provide a dynamic analysis method for water injection development of shallow ultra-low permeability sandstone reservoirs

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