Injection-production parameter optimizing method considering damage of injected water quality to reservoir

Abstract

The invention belongs to the field of oil-gas field development, and in particular to an injection-production parameter optimizing method considering the damage of injected water quality to a reservoir. The method comprises the following steps of: (1) arranging and building an original oil reservoir numerical simulation model data body file and giving an initial injection-production parameter scheme; (2) updating and calculating a skin factor value of a water injection well under the injection-production parameter scheme; (3) updating and saving the oil reservoir numerical simulation model data body file under the injection-production parameter scheme; (4) simulating and calculating the oil reservoir average water saturation value under the injection-production parameter scheme; (5) simulating and calculating the oil reservoir water saturation distribution variance value under the injection-production parameter scheme; (6) judging whether the injection-production parameter scheme reaches an optimization target or not; and (7) giving an optimal injection-production parameter scheme. Compared with the prior art, the method disclosed by the invention has the following beneficial effects: the heterogeneous characteristics of the oil reservoir and the influence of injected water on the damage to the oil reservoir are comprehensively considered; and based on an intelligent optimization algorithm, an optimal injection-production parameter regulating and controlling scheme design can be realized more scientifically, more accurately and more quickly.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to an injection-production parameter optimization method considering the damage of the injected water quality to the reservoir, which is used for improving the oilfield recovery rate of water-injection development. Background technique [0002] Water injection development is an important development method to improve oilfield recovery. Determining a reasonable injection-production working system is one of the key tasks in the design of reservoir water injection development plans. The optimal design of injection and production parameters needs to fully consider the physical properties of the reservoir and the existing development conditions, so as to maximize the balanced displacement of the reservoir developed by water injection, and to improve the oil recovery rate of the reservoir. [0003] Through searching, the invention patent with the authorized publica...

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Problems solved by technology

[0004] During the water injection development process of the reservoir, while the injected water supplements the formation energy to increase the production pressure difference between the injection and production wells, because the quality of the injected water is not up to standard, the suspended particles in it will block the formation, resulting in a decrease in the permeability and porosity of the reservoir near the injection well , the water injection pressure rises abnormally or cannot continue to inject water

The traditional injection-prod

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