Optimized Selection Method for Deep Profile Control and Water Shutoff Wells in Ultra-High Water Cut Oilfields

The ultra-high water cut period is the key period for waterflooding oilfields to further improve recovery efficiency. The simultaneous implementation of water shutoff in production well and profile control in injection well is an effective technique to start the remaining oil in ultra-high water cut reservoirs, but there is a lack of reliable method to optimize the selection of deep profile control and water shutoff wells during field construction. To this end, a method to identify the corresponding relationship between injection wells and production wells is proposed by using the static, dynamic and monitoring data of the reservoir. Based on this, an improved gray slope correlation model is applied to calculate the injection-production correlation coefficient based on the dynamic data of oil and water wells. Furthermore, the water drive non-uniformity coefficient and interwell outburst index are constructed, and a well selection decision method for simultaneous operation of oil and water wells in the target area of ultra-high water cut oilfields is established. The effect of deep profile control of deep profile control and water shutoff test area in Zone 7 of the Gudong oilfield proved that the decision-making method is scientific. The new construction method has perfect consideration factors, easy access to data and strong practicability, which plays an important guiding role in the optimization selection of deep profile control and water shutoff wells in ultra-high water cut oilfields.