The Field Application of Separated Zone Oil Production Technology Based on Electromagnetic Coupling Principle in Daqing Oilfield

Abstract Separated zone oil production technology plays a crucial role in resolving interlayer and planar conflicts, facilitating the comprehensive development of middle and low permeability layers, reducing ineffective water circulation, and optimizing residual oil recovery during the high water content phase in oilfields. The developed intelligent separated zone oil production technology, grounded in electromagnetic coupling principles, establishes a reliable downhole channel for transmitting power and data. This innovation obviates the need to retrieve the allocation pipe string during routine pump inspections, thereby extending the operational lifespan of intelligent production allocators (IPAs) and lowering operational costs. This paper presents the field application of electromagnetic coupling-based intelligent separated zone oil production technology in the Daqing oilfield. Currently deployed in four wells, this technology enables real-time monitoring of downhole temperature, pressure, and flow rates, facilitates regulation of zonal fluid production, and offers dynamic insights into various oil production strategies, including multi-layer combined production and single-layer rotational production. Experimental results from a single production rotation test illustrate significant operational outcomes. Following the adjustment of Test Well A from combined to single-layer production (Layer II), daily fluid production decreased from 21.11 t/d to 16.52 t/d, while daily oil production increased from 0.93 t/d to 1.05 t/d, and the average water content decreased from 95.64% to 93.66%. Pressure recovery tests conducted over three consecutive days in Test Well B, during pumping cessation, provided essential data for calculating reservoir parameters such as permeability and porosity. Moreover, repeated docking and separation tests between production and allocation pipe strings were successfully executed. After experiencing pump leakage 23 days into normal production, Test Well A underwent pump replacement and subsequent reinstallation of the production pipe string. Results confirmed successful docking of the downhole electromagnetic coupling device (DECD), ensuring system functionality. The successful implementation of this technology in Daqing oilfield underscores its suitability for pump inspection operations, high communication reliability, and extended operational life. This technological advancement not only addresses interlayer challenges in oil wells but also enhances reservoir understanding, promising widespread application prospects.