Abstract: In order to solve the problems of excessive waste, low monitoring and adjusting efficiency, and poor adaptability in horizontal wells and highly deviated wells, which compete with conventional separate water injection techniques in the Bohai Oilfield, a cable implanted intelligent separate injection technology was studied. The test units of temperature, pressure and flowrate were integrated into the intelligent measuring/adjusting cylinder, and together with the cable, they were used as the power and data transmission medium. In doing so, they achieved remote control over multiple wells and multi-layer nozzles on the ground, and were able to establish the real-time monitoring of downhole data, thereby forming a set of intelligent monitoring and adjusting technologies suitable for offshore oilfields. The field practice of 38 wells showed that this technology could significantly improve the measurement and adjustment efficiency, save operation time and operation space, and address challenges in the measurement and adjustment of offshore highly deviated wells and horizontal wells. The study suggests that this technology can provide a technical basis for the economic and efficient development of the Bohai Oilfield.