EXPERIENCE OF USING SIMULTANEOUS-SEPARATE DOWNLOADS AT THE AKSHABULAK TSENTRALNY DEPOSIT

Abstract

The traditional joint injection of water into several reservoirs with different permeability does not control bottom hole pressures and water flow for each of the reservoirs (by their current geological parameters), which leads to uneven watering of oil deposits. As a result, advanced watering of highly permeable oil reservoirs occurs, the degree of coverage decreases, uneven impact, and the development of each of the reservoirs with different reservoir properties, namely, permeability occurs. In order to reduce capital costs for drilling a new injection well in multi-layer fields, one injection well accounts for more than two perforated reservoirs of heterogeneous permeability to maintain reservoir pressure. The article describes the successful experience of implementing simultaneous-separate injection and analyzes the effectiveness of implementing the technology of simultaneous-separate injection using the example of the M-II-1 horizon of the Akshabulak Central field. Among the successfully conducted experiments, there is an increase in oil recovery, cost savings due to the effectiveness of the technology, and the absence of any complications during repair work. However, also, there are disadvantages: a decrease in injectivity for individual choke due to contamination of the internal section and an increase in injectivity due to wear of the choke, difficulties in assessing the depletion of separate layers due to the insufficient number of measurements of the inflow profile at production wells. For better results in the future, it is planned to redistribute the history of production across reservoirs at production wells on a capacitive-resistive model (CRM) using neural network technologies, using the account of PLT studies at production wells, and distributed injection across reservoirs at injection wells.