An inversion model of dynamic inter-well connectivity by using flow splitting method in processing heterogeneity of multilayer reservoirs

Abstract

Multilayer oil-bearing reservoirs are generally of strong heterogeneity, which hinder the commonly used numerical simulation methods. The existence of interlayer heterogeneity makes the model more complex and poses a higher challenge to the computational accuracy. In order to solve the above-mentioned problems, this article proposes a new calculation model of inter-well connectivity based on production data inversion technology. The model reflects the interlayer relationship by introducing flow splitting coefficients. The objective vector is established with the parameters of inter-well conductivity, dimensionless control volume and flow splitting coefficient. Adam algorithm is used to fit the production data which made the model result closer to the formation result. The mechanism model and real model are applied respectively to verify results in the research process. The model error is 4.9% and 5.6%, respectively, compared with the results of commercial reservoir numerical simulation software. The model provides a new solution to the problem of heterogeneity in multilayer reservoir and assists oilfield with better formulation of production strategy.