物性参数对特低渗油藏压裂效果的影响及参数组合优选

摘要

Physical parameters were directly related to fracturing effect of the ultra low permeability reservoir. Based on the investigation and analysis of more than one thousand production wells that the formation pressure were similar in Changqing oilfield, the conclusion was that porosity was the most sensitive factor to fracturing effect, the next was permeability, reservoir effective thickness, and the most insensitive factor was oil saturation. In the actual reservoir, the variation scope of porosity and permeability was small, but the reservoir effective thickness was big, so the quantitative relation of reservoir thickness, permeability, porosity and oil saturation should be comprehensively considered in the actual fracturing process of well and layer selection. And the quantitative relation can be determined by grey correlation method. The actual fracturing construction of seven wells in a block of Changqing oilfield show that grey correlation evaluation method can better meet the actual oil field fracturing on the basis of the reservoir physical properties on fracturing effect.%通过对长庆油田地层压力相近的一千多口采油井的调查分析,得出了四个物性参数中孔隙度对压裂效果最为敏感,其次是渗透率,再次为储层厚度,含油饱和度为最不敏感的因素.而在实际油藏中由于孔隙度与渗透率的变化范围较小,储层有效厚度的变化范围很大,使得在实际压裂选井选层过程中要综合考虑储层厚度、渗透率、孔隙度、含油饱和度之间的数量关系,该关系可以通过灰色关联法确定.对长庆油田某一区块7口井的压裂实际表明,以储层物性对压裂效果的影响分析为基础的灰色关联评价法能较好地符合油田实际压裂结果.