特低渗透砾岩油藏渗流机理研究——以八区下乌尔禾组油藏为例

RESEARCH ON SEEPAGE FLOW MECHANISM OF EXTRA LOW PERMEABILITY CONGLOMERATE RESERVOIR——Taking the district eight lower Wuerhe reservoir as an example

克拉玛依油田八区二叠系下乌尔禾组砾岩油藏属于低孔-特低渗油藏,受储集层严重非均质性影响,油藏生产表现为油井初产高、递减快、压力保持水平低,注水效率低,注水见效慢等特征。针对特低渗透砾岩油藏储集层的非线性渗透规律、应力敏感性,油、水两相渗流规律以及水驱油和渗吸采油的特征进行研究,深入认识特低渗透砾岩油藏渗流机理,掌握油藏递减原因,明确油藏开发机理,指导油藏后期加密调整工作,并结合储集层特征及渗流机理的认识,明确如何保证注水的有效性。

Karamay oilfield The district eight Permian lower Wuerhe conglomerate reservoir belongs to low porosity and low permeability reservoir,reservoir serious in heterogeneity,reservoir production performance shows those characteristics such as: the initial production of oil wells high,fast decline,low pressure level,low water injection efficiency,slow water injection response and so on. This article focuses on the special low permeability conglomerate reservoir nonlinear permeability,stress sensitivity,oil water two phase flow patterns,as well as water flooding imbibition oil recovery and the characteristics of research,in- depth understanding of extra low permeability conglomerate reservoir percolation mechanism,grasp the reservoir decline reason,clear reservoir development mechanism, guiding reservoir infilling adjustment late work, and combining the characteristics of reservoir and percolation mechanism of knowledge, determining how to guarantee the effectiveness of clear water.