低频谐振波辅助表面活性剂采油技术

针对陕北丰富川低渗透油藏水驱采收率低、开发效果差等问题，提出低频振动辅助表面活性剂复合开采技术。对低频振动条件下表面活性剂洗油、乳化、吸附性能以及应用效果进行了评价。实验结果表明:振动条件下，表面活性剂洗油效率可提高2.5%左右；表面活性剂自乳化能力增加，动态乳化使乳状液液滴平均粒径变小、分布均匀，降低了乳状液聚并的速度，使析水率降低，动力学稳定性增强；表面活性剂吸附等温线大幅度下降，吸附量减小。现场试验结果表明，区块综合含水降低15%以上，平均单井日增油40%左右，该复合技术的成功应用为低渗透油藏增油控水，提高水驱采收率提供了一定指导。

Research on oil recovery technology of surfactant flooding assisted by low frequency resonance wave

Aiming at the problems of low water displacement recovery and poor development effect in low permeability reservoir of Fengfuchuan in Shanbei, a new oil recovery technique of surfactant flooding assisted by low frequency resonance wave is proposed in this paper. The oil extraction, emulsification, adsorption of surfactant under low frequency vibration wave and application effect are evaluated by laboratory experiments combined with field application. The indoor experiments results show that under low frequency vibration wave, oil extraction efficiency can improve about 2.5%; meanwhile, the increase of self emulsifying ability makes the average droplet size of emulsion become smaller and uniform distributed, and it also reduces both the coalescing velocity of emulsion liquid and separating water rate resulting in dynamic stability being enhanced. Adsorption isothermal of surfactant falls dramatically accompanied by adsorption capacity reduce. The reservoir field test results show the water cut is reduced by 15% or more with average oil increase of about 40% for single well. Successful application of the composite technology provides some guidance in low permeability reservoirs for increasing oil production, controlling water and improving water flooding recovery.