Water drive development oil reservoir well pattern injection-production relation determination method

Abstract

The invention provides a water drive development oil reservoir well pattern injection-production relation determination method. The method comprises the steps of a first step of determining injection rate sample data of injecting wells and output sample data of producing wells or a producing well set according to production data of a water injection well in an oilfield and an oil producing well; a second step of performing filtering processing on the injection rate sample data of the injecting wells and the output sample data of the producing wells or the producing well set respectively to determine output responses of the producing wells or the producing well set corresponding to the step change of injection rates of the injecting wells; a third step of determining the injection-production relation of each injecting well and the corresponding producing well or the producing well set according to the output responses of the producing wells or the producing well set corresponding to the step change of the injection rates of the injecting wells. According to the water drive development oil reservoir well pattern injection-production relation determination method, the injection-production relations of water drive development oil reservoirs are estimated according to the injection rates of the injecting wells and the output data of the producing wells, the efficiency is improved, and the problem of the response lag of the producing wells caused by the factors of well spacing and permeability and the like is eliminated.

Description

Technical field [0001] The invention relates to the field of petroleum exploration, in particular to a method for determining the injection-production relationship of a water drive development reservoir well pattern. Background technique [0002] Water flooding is currently the world's most widely used oilfield development method with the best technical and economic benefits. About 60% to 70% of oilfields are developed mainly by water flooding. The annual oil production of water flooding accounts for more than 60% of the world's crude oil production. Waterflooding management is one of the important ways to stabilize production or slow down production decline in waterflooding development. The key to waterflooding management is not only the division of strata, but also the deployment of well patterns, perforation optimization, and optimization and adjustment of injection-production parameters. In the development process, it is necessary to adjust the injection well's water injectio...

AI Technical Summary

Problems solved by technology

[0005] 1) The complex reservoir environment and massive oilfield data make it very difficult and inefficient for experts to perform manual analysis;

[0006] 2) The limitations of the analysis of the injection-production relationship of the injection well near the production well often cannot estimate the long-distance injection-production relationship caused by strong heterogeneity such as fractures

However, the above model is not applicable to the estimation of the injection-production relationship that changes with the injection-production process, or it involves many parameters and is difficult to solve, so it is difficult to apply to the estimation of the injection-production relationship of thousands of injection wells and production wells

[0009] The prior art also estimates the impact of a step change in the injection volume of an injection well on a certain production well or group of production wells at the same time based on the Kalman filter method, without considering the response of the production well due to factors such as well spacing and permeability. lag problem, and the extended Kalman filter method used is relatively complicated to calculate

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