Accurate identification of high water consumption zone is the basis to deal with a variety of inefficient water cycle treatments. Aiming at the high water consumption zone formed during the long-term water injection development of sandstone reservoir, a seepage numerical simulation model with one injection well and one production well of oil-water two-phase is established to analyze the variation characteristics of water cut derivative of production well in the high water consumption zone, and the evaluation indicators of high water consumption zone are also established. A new method for identifying and evaluating high water consumption zone based on the water cut derivative curve characteristics of production well is proposed. The results show that the water cut derivative curve of the production well has a double-peak characteristic when there is a high water consumption zone between the injection and production wells while it has a single-peak characteristic when no high water consumption zone is developed, and that the appearance time and magnitude of the peak reflect the extent to which the injected water rushes along the high water consumption zone. According to the first peak of the water cut derivative curve of the production well between the injection and production wells, the high water consumption zone and its level can be accurately identified and evaluated. The practical application results show that the method is simple and has high accuracy and applicability.

sandstone reservoir  /  high water consumption zone  /  identification method  /  water cut derivative