Abstract: In the fracture intersection regions in carbonate reservoirs in the Tahe Oil Field, strong formation energy often causes water breakthrough, which is harmful for oil production. How to suppress bottom water coning is a major problem. Field works show that we can estimate in advance water avoidance height by monitoringflow pressure periodically, which can control water breakthrough effectively and prolong water-free oil production period. The wells in river dominant areas are filled severely, and big production pressure differential makes it difficult for oil production. For these wells, we should avoid filled caves and inject acid fluid to connect reservoirs. Pipe casing leaks more and more often in production, which can be found by injection profile testing. Fractured and vuggy reservoirs have strong water absorption ability, so the leaking position of pipe casing absorbs less water and shows minor changes on flow amount and temperature curves. In this situation, we can compare GR curves to find leaking position.