摘要
处于油水过渡带上的岩性油藏初始含水饱和度大于束缚水饱和度,传统油水相对渗透率曲线推导的含水率预测模型不能准确揭示油藏实际生产过程。利用储层压力、温度、初始含水饱和度条件下的油水相渗曲线,得到新型油-水渗流规律关系式,建立含水率、含水上升率与采出程度理论曲线。根据油田生产测试资料,结合典型甲型、丙型水驱特征曲线模型,验证了新方法的适用性和有效性。研究结果表明:新方法预测的含水上升规律符合研究区块开发全过程,弥补了水驱特征曲线适用范围的局限性;新方法预测的含水上升率值为0.25~2.95,含水率达到95%时预测水驱采收率为23.8%。研究成果为岩性油藏含水规律预测提供了一种不依赖于生产数据的新方法,对该类油藏高效注水开发具有指导意义。
Lithologic reservoirs distributed on oil/water transitional belt may have saturation of original water higher than that of bounded water. Under such circumstances, the water cut prediction model generated by using conven- tional oil/water relative permeability curves may fail to characterize actual production processes of the reservoir ac- curately. In the concerned study, oil/water relative permeability curves under reservoir pressure, temperature and initial water saturation conditions have been used to highlight the innovative patterns in oil/water seepage. In this way, theoretical curves for water cut, increases in water cut and recovery ratios can be established. With considera- tion to field production data, together with features of plots in water-flooding operations of Type 1 and Type 3, ap- plicability and efficiency of the new technique can be verified. Research results show the innovative technique can highlight patterns in water cut increases conforming to those observed in the development of the concerned block. The technique can effectively remove the limitations in application extent of curves in water-flooding operations; According to the technique, predicted recovery ratio is 23.8% for water-flooding operations with expected water cut increment rates of 0.25-2.95 and with water content of 95%. Relevant research results may provide an innovative method independent of production to predict patterns of water cut in lithologic reservoir. Research conclusions may provide valuable references for high-efficiency development of such reservoirs through water flooding.
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第5期116-119,共4页
Special Oil & Gas Reservoirs
基金
国家"973"计划"致密油高效开发油藏工程理论与方法研究"(2015CB250905)
陕西省科技统筹创新项目"延长难采储量有效动用开发技术研究"(2016KTCL01-12)
关键词
岩性油藏
含水上升规律
实验
油水相渗曲线
化子坪区
延长油田
lithologic reservoir
pattern in water cut increase
experiment
oil/water permeability curve
Huazip-ing Area
Yanchang Oilfieid
