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胜利油区近年来发现的低渗透、特低渗透砂岩油藏,开发中普遍存在产能下降快、注水压力高和解堵效果差的实际问题,严重制约了该类型油田的有效动用。在对低渗透油藏储层特性系统分析基础上,评价了注入水悬浮固相微粒、乳化油对储层伤害,研究了储层残余油、润湿性对水相渗透率的影响规律,研制了耐高温高盐的表面活性剂增注体系,结合地层预处理技术,形成适合不同井况条件下低渗透砂岩油藏复合增注技术。
The low permeability and ultra-low permeability sandstone reservoirs discovered in Shengli Oilfield in recent years generally have the problems of rapid decrease of production capacity, high injection pressure and unblocking effect, which have seriously restricted the effective utilization of this type of oilfield. Based on the systematic analysis of the reservoir properties of low permeability reservoirs, the effects of injecting water-suspended solid particles and emulsified oil on the reservoir damage were evaluated. The influence of residual oil and wettability on the permeability of the water phase was studied. The high temperature and high salinity surfactant injection system, combined with formation pretreatment technology, formed under different well conditions for low permeability sandstone reservoir composite injection technology.