润湿反转剂提高灰岩裂缝油藏基质系统水驱采收率实验

大港油田官3断块属生物灰岩，裂缝发育，水驱条件下储量动用难。针对润湿反转剂的界面吸附和润湿反转特性，结合该断块灰岩油藏混合润湿的特点，进行了油藏岩心水驱效果评价及润湿反转剂提高水驱采收率方法的室内研究。结果表明，润湿反转剂具有低吸附、高活性的特点，可有效地提高基质系统原油采出程度，实验条件下，可提高水驱采收率8％以上。

Experiment of enhanced oil recovery of matrix system in fractured limestone reservoirs by reverse wetting agent

Guan 3 fault block in Dagang oilfield belongs to bio-genie limestone oil reservoir with developed fractures. Reserves are difficult to produce by waterflooding. To counter interfacial adsorption and wettability reversal of the reverse wetting agent, and the features of mixed wetting in the limestone oil reservoir of this block, laboratory research is done on effect evaluation of oil reservoir core by water drive and EOR method of reverse wetting agent. The results present that the agent has the features of low adsorption and high activity, and oil recovery percent of reserves in matrix system may be increased effectively. Recovery efficiency can be improved above 8 percent under laboratory conditions.