辽河油田沈95块储层伤害研究

针对辽河油田沈95块油藏储层渗透率低、原油凝固点高的特点,对该区储层的岩矿特征、孔隙结构及流体物性、敏感性、水驱特征等进行了实验分析和开发实验技术研究.认为目前造成储层伤害的主要因素有:原油中石蜡析出造成油井井底附近地层渗透性下降;注入水水质差引起注水井近井地带的储层伤害;颗粒运移主要造成地层深部伤害及细菌堵塞、地层敏感性伤害等.并在大量实验的基础上结合前人研究成果,提出了相应的改善方案和建议.

Research on reservoir damage in Block Shen 95, Liaohe Oilfield

In view of low permeability of the reservoir and high freezing point of the crude oil, the authors conducted a comprehensive research on reservoir damage, which included petrologic-mineralogical characteristics, pore structure, fluid roperties, sensitivity and water-drive features by using experimental analysis and xploitation test. On such a basis, it is held that the main factors responsible for reservoir damage are as follows: separation of paraffin wax in the crude oil resulted in the falling of the stratigraphic permeability near the bottom of the oil well; the reservoir near to the water-injection well was damaged by bad water_injection quality; particle migration caused deep stratigraphic damage, bacterial plug and stratigraphic sensitivity damage and so on. Based on experimental data analysis, the authors have reached some conclusions and also put forward a few suggestions and schemes for improvement.