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方法根据宝浪油田地质特征,选取有代表性的样品实验研究了宝浪油田低孔、低渗油藏水驱油渗流特征。目的验证宝浪油田水驱油的渗流特征,据此提出其油田注水开发过程中应注意的问题。结果宝浪油田低孔、低渗油藏渗流特征具有低速非达西渗流的启动压力梯度和临界压力梯度较高、束缚水饱和度较高、残余油饱和度较低、残余油状态的相对渗透率较高、两相流动区间较宽的特点;相渗曲线类型多,其中水相相渗曲线形态以直线为主;水驱压力梯度、注入水水质、孔隙结构对油水渗流及水驱油效率有重要影响。结论宝浪油田无水期驱油效率和最终驱油效率高。为了获得较理想的水驱油效果,必须对油层进行改造;在注水开发时要严把注水水质关,在开发部署上应尽量延长无水采油期
Methods Based on the geological characteristics of Baolang Oilfield, representative samples were selected to study the seepage characteristics of water flooding in low porosity and permeability reservoirs in Baolang Oilfield. Objective To verify the seepage characteristics of water flooding in Baolang Oilfield, and to put forward the problems that should be paid attention to in the process of water flooding development. Results The seepage characteristics of low-porosity and low-permeability reservoirs in Baolang oilfield are characterized by high starting pressure gradient and critical pressure gradient, low irreducible water saturation, low residual oil saturation and relative infiltration of residual oil The rate of water flooding pressure gradient, injection water quality, pore structure of oil and water seepage and water flooding efficiency Have a significant impact. Conclusion The Baolong oilfield has high water-flooding efficiency and high final oil-displacement efficiency. In order to obtain a better water flooding effect, it is necessary to reform the reservoir. During water flooding, the quality of water flooding should be strictly controlled. During the development and deployment, the oil recovery period should be as long as possible