Abstract:

The single-tubing layered testing and adjustment injection process for offshore oilfields cannot meet the conditions of wells with inclinations greater than 60°. At the same time, steel wire operation is required during logging, and a single well takes six hours on average. The logging efficiency is low, and it cannot truly achieve the real-time monitoring of downhole temperature, pressure, flow rate, and injection volume adjustment. On the basis of introducing the principle, applicability, and characteristics of intelligent polymer injection technology with cable control in offshore oil fields, key supporting tools such as cable control intelligent polymer injection pipe, high viscosity maintaining channel under large flow rate, and ground controller have been developed. Experiments have shown that the pipe has better performance with a differential throttle pressure of less than 4 MPa and a viscosity retention rate of more than 85%. Field applications demonstrated that the cable-controlled smart polymer injection technology can provide real-time feedback on flow rate, pressure, temperature, and other monitoring data during the layered polymer injection debugging process in high-inclination wells. This improves the efficiency of polymer injection well testing and adjustment and the standardization rate of reservoir allocation, offering effective technical support for enhancing the recovery factor in offshore oilfield polymer flooding operations.

Key words: offshore oil fields, stratified polymer injection, measuring and adjusting efficiency, large slope, monitoring