Strategy for increasing the productivity of low-permeability reservoirs at the U-XIV horizon of the field in the Mangystau region

This article discusses the actual problems of developing residual reserves in mature fields with The article analyzes modern problems of development of residual oil reserves in mature fields with low reservoir properties. The field under study is characterized by multiple productive formations, tectonic disturbances and a variety of lithological characteristics in the intervals of the Jurassic productive strata. The field is characterized by structural complexity, heterogeneity of productive strata, various degrees of reserves development and a variety of residual balance reserves. The purpose of the work was to identify areas with low reservoir properties and assess the possibilities of optimizing their exploitation to improve the efficiency of oil production. To analyze current and predicted oil recovery factors (ORF), a calculation tool was developed using methods for evaluating displacement characteristics, including the Sazonov, Kambarov, Pirverdyan, Sipachev, Nazarov, Abyzbayev and Gaisin methods. These methods take into account various dependencies of the development parameters, which allows for more accurate prediction of oil recovery factors in the studied areas. The work also includes ranking of areas by residual recoverable reserves, production rates and projected growth of the oil recovery factor. Promising areas were identified for the construction of sector geological and hydrodynamic models (GHDMs), which allows for a more detailed assessment of opportunities to improve development efficiency. GHDMs were built and adapted for two selected areas with low reservoir properties, taking into account well parameters, development history, and reservoir filtration characteristics.