Abstract: The carbonate fractured-vuggy reservoirs with bottom water in Ordovician are most contributive in the Tahe Oilfield, and are characterized by extremely high heterogeneity. The current depth of plunger in the Tahe Oilfield has reached 2 606 m, and is deepening gradually. The working fluid level of 120 wells is below 2 500 m, accounting for 15.4% of total wells. In wells with insufficient liquid supply, water injection and deep pumping are the only ways to maintain normal production. When water injection fails in single well or unit, deep pumping is the main measurement to improve well production and development effect. The next step is to resolve the contradiction between pump setting depth of sucker rod pump and pump output, starting to develop the deep pumping technology of bull pump. The deep pumping technology for large sucker rod pump has been applied successfully in the Tahe Oilfield, and has increased oil production significantly. At present, the technology has been successfully applied for 3 times.