The development of multilayer deposits is complicated by both behind-the-casing circulations between layers along a low-quality cement ring and along a single layer with an aquifer. In production wells, the occurrence of circulations leads to premature water encroachment of the produced product, and in injection wells - to uncontrolled injection of water into unproductive layers. The paper considers the problem of behind-the-casing circulation in oil fields. Methodological approaches to determining the analytical dependencies of the effect of acid treatments on the occurrence of behind-the-casing circulation are presented. For this purpose, an analysis and generalization of the experience of implementing well acid treatment technologies were carried out with the identification of complicating factors influencing the occurrence of behind-the-casing circulation. The supposed reasons for the formation of behind-the-casing circulation in wells with a division into technical, technological and geological factors are formed. The research methods are based on the analysis of information from production data of wells exploiting carbonate deposits, as well as the results of studies using mathematical statistics methods. Based on the results of the analysis of the work performed, the technological parameters of the influence on the occurrence of behind-the-casing circulation in wells were determined, which can be used to optimize the technology of acid treatments and reduce the probability of behind-the-casing circulation.
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