低渗高含水砂砾岩油藏产能影响因素研究

Study of production effect factors in high water-cut low permeability glutenite reservoir

评估油藏产能并分析其影响因素是制定油藏开发方案时必不可少的一个环节,低渗透低产能高含水砂砾岩油藏开发也不例外。以乌尔禾油田W井区油藏为例,在井区分区的基础上对油藏产能进行了分析,从储层特征参数、启动压力梯度、油水分布及射孔参数等方面对油藏产能影响因素进行了分析研究,其中,在启动压力梯度影响作用的基础上分析了定井距条件下注采压差对产能的影响。经研究发现,针对油藏低渗透特征,启动压力梯度对油藏的储层动用程度有明显影响,进而对油藏产能产生很大影响;而针对油藏高含水特点,射孔层位的选取对油藏产能也存在十分明显的影响。

Evaluating the productivity and analyzing the effect factors is an indispensable part of formulating the reservoir development program while the low productivity low permeability glutenite reservoir with high water cut is no exception.Taking W well area of Wuerhe oilfield as an example, the productivity was analyzed by zoning the well area and then the pro-duction effect factors were analyzed,including reservoir characteristic parameters,the thre-shold pressure gradient, the distribution of oil and water and perforating parameters.In this process,the influence of injection-production pressure on the productivity with the effect of the threshold pressure gradient under the certain condition of well spacing was also analyzed.The result of the study showed that for the low permeability characteristic,the threshold pressure affects gradient reservoir producing ratio obviously so that it has a significant impact on the productivity while for the characteristic of high water cut, the selection of perforation positions also influences the productivity visibly.