摘要
为进一步提高低渗透油藏水驱后的采收率,合成了一种新型双子表面活性剂SDB-101,并优选出非离子表面活性剂DMR-2,将两者进行复配,形成一种适用于低渗透油藏的化学驱油用表面活性剂复配体系。对表面活性剂复配体系的界面活性、耐温性能、抗盐性能及驱油效果进行了评价,结果表明:复配体系的最佳配比(w)为0.15%SDB-101+0.15%DMR-2,该体系的油水界面张力值为0.002 9 mN/m。该体系具有较好的界面活性及耐温抗盐性能,当温度为120℃时,体系的界面张力为0.007 2 mN/m;当矿化度为98 000 mg/L时,体系的界面张力为0.008 2 mN/m,均能维持在10^(-3)mN/m超低界面张力的数量级标准。低渗岩心水驱后注入2PV的该表面活性剂复配体系,采收率提高15个百分点以上,人造岩心及天然岩心的最终采收率分别达到了61.69%和54.57%,驱油效果较好。
In order to further improve the recovery of low permeability reservoirs after water flooding, a new Gemini surfactant SDB-101 is synthesized,and a non-ionic surfactant DMR-2 is selected. The two surfactants are compounded to form a surfactant compound system for chemical flooding in low permeability reservoirs. The interfacial activity, temperature resistance, salinity tolerance and oil displacement performance of the composite system are evaluated. The results show that the optimum ratio of the composite system( w )is 0.15% SDB- 101 + 0.15% DMR- 2, the interfacial tension of the system is 0.002 9 mN/m . The system has good interfacial activity, temperature resistance and salinity tolerance. The interfacial tension of the system is 0.007 2 mN/m at 120 ℃ and 0.008 2 mN/m at 98 000 mg/L of salinity, which can be maintained in the order of magnitude of ultra-low interfacial tension at 10 -3 mN/m. After injecting 2PV surfactant mixture system into low permeability core after water flooding, the oil recovery increases by more than 15 percentage points, and the final recovery of artificial cores and natural cores reaches 61.69% and 54.57%, respectively. The oil displacement effect is good.
作者
李英贤
袁志华
张宝财
LI Yingxian;YUAN Zhihua;ZHANG Baocai(School of Earth Sciences, Yangtze University, Wuhan 430100, China;Bohai Drilling Technology Service Branch Company, Tianjin 300450, China)
出处
《能源化工》
2018年第6期40-43,共4页
Energy Chemical Industry
关键词
低渗透油藏
化学驱油
表面活性剂
耐温抗盐
采收率
low permeability reservoirs
chemical flooding
surfactants
temperature resistance and salinity tolerance
oil recovery
