CAJ | 학술논문

针对低渗透油藏注水突破快、无效水循环严重的问题，开展了粘弹性表面活性剂驱油体系的室内研究。通过界面性能和体相流变性能对粘弹性表面活性剂体系进行了评价和优化，得到了具有扩大波及体积和提高驱油效率功能，并具有良好注入性的粘弹性表面活性剂体系。该表面活性剂还具有良好的界面性能，浓度介于0.05%~0.3%时，能够将油水界面张力降低到10-2 mN/ m 数量级，并具有迅速剥离油膜的能力。在0.15%以上，体系的粘度随着浓度的升高而迅速升高，当浓度达到0.3%时，体系的粘度达到20.1 mPa·s（50℃）。该体系能够通过直径0.2μm 的核孔膜，而聚合物则因为堵塞核孔，不能通过0.2μm 核孔膜。模拟驱油实验结果表明，该体系可以在水驱基础上提高采收率8%左右。以上研究结果表明，粘弹性表面活性剂体系在低渗透油藏低储层伤害开发中具有很大的潜力。
침대저삼투유장주수돌파쾌、무효수순배엄중적문제，개전료점탄성표면활성제구유체계적실내연구。통과계면성능화체상류변성능대점탄성표면활성제체계진행료평개화우화，득도료구유확대파급체적화제고구유효솔공능，병구유량호주입성적점탄성표면활성제체계。해표면활성제환구유량호적계면성능，농도개우0.05%~0.3%시，능구장유수계면장력강저도10-2 mN/ m 수량급，병구유신속박리유막적능력。재0.15%이상，체계적점도수착농도적승고이신속승고，당농도체도0.3%시，체계적점도체도20.1 mPa·s（50℃）。해체계능구통과직경0.2μm 적핵공막，이취합물칙인위도새핵공，불능통과0.2μm 핵공막。모의구유실험결과표명，해체계가이재수구기출상제고채수솔8%좌우。이상연구결과표명，점탄성표면활성제체계재저삼투유장저저층상해개발중구유흔대적잠력。
Investigation on viscoelastic surfactant fluid was carried out to check its adaptability in low per-meability reservoirs. According to investigation on interfacial property and rheological property of the aqueous solution,a viscoelastic surfactant fluid that can improve the swept volume and oil displacement efficiency was obtained. The surfactant systems can decrease the oil-water interfacial tension to a magni-tude of 10 - 2 mN/ m when the mass concentration range is between 0. 05% ~ 0. 3%(mass concentra-tion). And they can also remove the oil film promptly. The viscosity of the system increases promptly above 0. 15% and reaches 20. 1 mPa·s at 0. 3%(50 ℃). Filtration factor results show that this surfac-tant system can filter though the porous membrane with pore diameter of 0. 2 μm. However,polymer solu-tions will block the pore throat. Additionally,the surfactant system can make an improvement of 8% oil recovery compared to water flooding. The research may provide a new method to enhance oil recovery without environmental damage in low permeability reservoir exploit.