Water saturation-based dynamic oil well yield splitting method

Abstract

The invention provides a water saturation-based dynamic oil well yield splitting method. The method includes the following steps that: S1, oil well data are acquired, an oil well database is established; S2, oil-water relative permeability data are processed; S3, the flow coefficient difference of sub-layer produced fluid is determined; S4, production time nodes are divided; and S5, a yield splitting coefficient is calculated. According to the water saturation-based dynamic oil well yield splitting method of the invention, when oil well yield splitting is performed, non-fluid producing layers are screened out at first, and therefore, a yield splitting result is more accurate.

Description

technical field [0001] The invention relates to the technical field of oil wells, in particular to a method for splitting oil well production based on dynamic water saturation. Background technique [0002] At present, domestic and foreign calculation methods for the production of small layers mainly include ① liquid production section coefficient method; ② effective thickness (H) method; ③ static split formation coefficient (KH) or flow coefficient ④ dynamic split equation method; ⑤ numerical simulation method, etc. At the same time, in the process of practical application, many production splitting methods have been summarized, such as: production composition method, balance splitting method based on injection-production well group, dynamic splitting method based on water saturation, etc. [0003] However, there are the following defects and deficiencies in the calculation methods of the small layer yield in these prior art: [0004] The liquid production profile coeffi...

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Problems solved by technology

[0006] The stratum coefficient splitting method considers that all strata with effective thickness have production. This method is easy to obtain data and the splitting method is simple, but it does not fully consider factors such as reservoir connectivity, production pressure difference, material balance and energy balance, and the parameters are relatively single , only the permeability is regarded as a fixed value, and less consideration is given to the factors affecting reservoir physical properties and seepage law, as well as the influence of factors such as interlayer interference on production splitting, which makes the splitting accuracy lower and usually cannot be obtained. Meet the actual needs, this method is more suitable for sandstone reservoirs with few perforated layers, small production intervals and weak reservoir heterogeneity;

[0007] The dynamic split equation method is based on the principle of seepage mechanics, and analyzes the dynamic and static factors affecting water injection according to the geology, oil displacement and production conditions of each oil well. However, because many parameters are difficult to determine in practical applications, the calculation is difficult, which is not conducive to promotion application;

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