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针对非均质砂岩油田开发后期由于含水率不断上升、地层压力水平下降而进行的注采结构调整，必须要在合理的地层压力下限值以上进行，才能获得好的经济效益。作者以河南双河油田为例，从采油工艺原理与矿场资料相结合入手找出了一种最小地层压力值的求解方法，实际应用效果良好。这证明，水驱砂岩油田开发后期开发单元或油田的最小压力保持水平界限，可作为开发后期综合调整的依据。
Aiming at the adjustment of injection-production structure due to the rising moisture content and the decrease of formation pressure in the late development stage of heterogeneous sandstone oilfields, it is necessary to carry out adjustment above the lower limit of formation pressure in order to obtain good economic benefits. Taking Shuanghe Oilfield in Henan Province as an example, the author finds out a method of solving the minimum formation pressure based on the principle of oil recovery process and the mine data. The practical application is good. This proves that the minimum pressure of development units or fields in the late stage of water-flooding sandstone oilfields can maintain the horizontal limit, which can be used as the basis for comprehensive adjustment in the later stage of development.