GH稳粘剂对碱/聚二元体系驱油性质的影响

INFLUENCE OF GH COMPOUNDED VISCOSITY STABILIZER ON OIL DISPLACEMENT PROPERTIES OF ALKALI/POLYMER SYSTEM

针对大港羊三木油田污水配注碱/聚二元复合驱过程中出现的体系粘度严重损失现象,研制了GH稳粘剂。为了考察该稳粘剂对碱/聚二元复合驱的最终驱油效果是否有利,就其对二元体系驱油性质的影响进行了逐一分析。利用热氧老化实验、界面张力仪和流变仪测定以及扫描电镜观察,研究了在添加GH稳粘剂与不添加该稳粘剂时碱/聚二元体系的长期热氧稳定性、界面张力、流变性、粘弹性以及微观形态。结果表明,GH稳粘剂能在不破坏碱/聚二元体系假塑性流变特征以及超低界面张力的基础上,通过提高其微观结构的稳定性,使得二元体系的长期热氧稳定性大幅度改善,同时粘弹性增强。GH稳粘剂有助于提高碱/聚二元体系的稳定性,在提高采收率方面具有良好的现场应用前景。

Aiming at the serious viscosity loss occurring during Alkali/Polymer (AP) flooding of Dagang Yangsanmu Oilfield,GH viscosity stabilizer is formulated and developed.In order to research whether this viscosity stabilizer is useful to ultimate displacement characteristics of AP flooding,its effectiveness on displacement properties of AP system is analyzed one by one.Thermal-oxygen aging experiment,interfacial tensiometer and rheometer measurement,as well as SEM observation are applied to study long-term thermal-oxygen stability,IFT,rheological properties,viscoelastic properties and microscopic shape of AP system when GH viscosity stabilizer is added and not.The result shows that GH can keep the pseudoplasticity rheologic property and ultra-low interfacial tension of AP system and improve its long-term thermal-oxygen stability and viscoelastic properties through strengthening its micromechanism.GH viscosity stabilizer contributes to improve the stability of AP system,and possesses favorable field practice prospect in EOR.