Substantive drilling rejuvenation in mature oil fields as a way to extract residual oil reserves

The article highlights the issues of increasing the production efficiency of the operational facility reserves at one of the large oil fields at the final stage of development. On the example of one of the facilities, a methodological approach to the development analysis is considered, which allows determining the optimal strategy for further reserves development, the effectiveness of which is subsequently confirmed by the successful geological and technical measures implementation. Based on the results of lateral horizontal trunks sealing, the assumption of residual reserves localization in the inter-well space associated with the historical fund from operation retirement with a decrease of the gas lift operation technology efficiency due to an increase in waterlogging is confirmed. It is established that for the conditions considered, the well grid density and the multiplicity of the formation pore volume flushing have a direct impact on the production efficiency. The first drilling results confirmed the sufficient predictive capacity of the complex analysis and allowed to resume the substantive drilling program at the facility with reserves of more than 85%, the main grid of wells of which was fully implemented more than 40 years ago.