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应用油藏工程方法,综合考虑驱替压力梯度和启动压力梯度的影响对薄差储层有效驱替理论进行研究.根据不等产量一源一汇驱替压力梯度公式,分别得到地层压力、注入压力、井底流压以及井距变化时的驱替压力梯度图版,并分析其变化规律;根据岩心水动力实验结果,建立启动压力梯度与渗透率的关系,分析有效驱动不同渗透率的储层所需要的驱替压力梯度临界值.研究表明:驱替压力梯度大于最大启动压力梯度是薄差储层有效驱替的必要条件;小井距是薄差层有效驱动的最优选择;可以通过措施和注采压力系统调整达到驱替压力梯度高于最大启动压力梯度的目的,从而有效驱动薄差储层.研究对薄差储层开采具有重要的指导意义,并在矿场试验中得到了有效论证.
Based on the method of reservoir engineering, considering the effect of displacement pressure gradient and starting pressure gradient, the effective displacement theory of thin difference reservoirs is studied.According to the pressure gradient equation of unequal output, Pressure, bottom-hole flow pressure and displacement pressure gradient when the well spacing is changed, and analyze its variation rule. According to the core hydrodynamic test results, the relationship between the start-up pressure gradient and permeability is established, and the reservoir that effectively drives different permeability The research shows that the displacement pressure gradient is larger than the maximum starting pressure gradient, which is the necessary condition for effective displacement of thin-poor reservoirs. Small well spacing is the optimal choice for effective driving of thin-poor layers. The adjustment of injection-production pressure system achieves the goal of displacing the pressure gradient higher than the maximum starting pressure gradient to effectively drive the thin difference reservoirs.The study has important guiding significance for the exploitation of thin difference reservoirs and has been validly proved in the field tests .