Optimization procedure for conformance control

Abstract

The article is devoted to the development of an optimization procedure for conformance control treatment. Currently, due to the significant share of reservoirs with high water cut, it is relevant to use methods that allow reducing the rate of production water cut increase. One of the most common methods to do this is to improve conformance by injecting suspension into the reservoir. The classical model of deep bed suspension migration has shown itself well for calculating the technological parameters of treatment, but it does not contain criteria for optimizing the process. The introduction of such criteria and their physical justification is the purpose of this work. The following objectives were set: modification of the classical model of deep bed suspension migration for layered strata, introduction of criteria of suspension treatment efficiency, and optimization of the process. Mathematical model consists of mass conservation laws and Darcy’s law. Initial data were selected for one of the fields in West Siberia, where suspension treatments were carried out to improve conformance. The field experience of these treatments is analyzed, the wells where the treatment was successful are determined. The new criterion for the effectiveness of suspension treatment is introduced. This criterion is the difference in the standard deviations of the flow rate along the layers before and after the treatment. It is established that this difference more clearly demonstrates the injectivity profile exchange than the classical Dykstra-Parsons criterion. The optimization procedure allows assessing the required slug volume that provides the maximum injectivity profile redistribution.