针对低渗透油藏注入性差、洗油效率低,水驱无法有效提高采收率等问题,提出了一种低界面张力小分子驱油剂(LST溶液)提高低渗透油藏采收率新技术,评价了该驱油剂的界面活性、增黏性、乳化性、润湿性及其油藏环境适应性和驱油效果。结果表...针对低渗透油藏注入性差、洗油效率低,水驱无法有效提高采收率等问题,提出了一种低界面张力小分子驱油剂(LST溶液)提高低渗透油藏采收率新技术,评价了该驱油剂的界面活性、增黏性、乳化性、润湿性及其油藏环境适应性和驱油效果。结果表明,该驱油剂具有良好的界面活性和增黏性。在6788.23 mg/L的矿化水中,质量分数为0.4%时的LST溶液的油水界面张力为0.012 m N/m,且黏度与油藏原油黏度(3.4 m Pa·s)相近。LST溶液具有较好的油水乳化能力,可改善油藏水润湿性。在47.2℃、油水比为1∶1的条件下,LST乳状液的稳定时间为120 min。岩心经LST溶液处理后,水相接触角由57.0°降至12.5°,油相接触角由24.3°增至38.6°。LST溶液具有良好的静态抗吸附性能,经岩心3次吸附后,LST残液与原油间的界面张力仍能达到10^(-2)m N/m数量级,黏度达2.895 m Pa·s,乳状液静置10、120 min的析水率分别为38.6%、73.4%。LST溶液的耐盐性能较好。在矿化度为16570 mg/L的环境下,其油水界面张力低于7×10^(-2)m N/m、黏度为3.06 m Pa·s。LST溶液的驱油效果较好,可有效封堵高渗透孔道,启动低渗透孔道残余油。注入0.4 PV 0.4%LST溶液可使均质岩心(0.05μm^(2))的水驱驱油效率提高11.21百分点,非均质岩心(级差3~10)水驱后的综合采收率提高6.55百分点~19.41百分点。LST溶液可以实现低剂量或低成本有效提高水驱采收率,在低渗透非均质油藏化学驱提高采收率方面具有较好的应用前景。展开更多
In order to determine the low interfacial tension,a spinning drop interfacial tensiometer was constructed.The apparatus was calibrated by measuring the interfacial tension of some low molecular weight systems and poly...In order to determine the low interfacial tension,a spinning drop interfacial tensiometer was constructed.The apparatus was calibrated by measuring the interfacial tension of some low molecular weight systems and polyethylene glycol /dextran aqueous two-phase systems,with the determination error of 3.The interfacial tensions of PEG1000/Na2SO4,PEG/MgSO4 and PEG1000/(NH4)2SO4 aqueous two-phase systems Were determined.It is found that the salt type has strong effect on the interfacial tension.展开更多
文摘针对低渗透油藏注入性差、洗油效率低,水驱无法有效提高采收率等问题,提出了一种低界面张力小分子驱油剂(LST溶液)提高低渗透油藏采收率新技术,评价了该驱油剂的界面活性、增黏性、乳化性、润湿性及其油藏环境适应性和驱油效果。结果表明,该驱油剂具有良好的界面活性和增黏性。在6788.23 mg/L的矿化水中,质量分数为0.4%时的LST溶液的油水界面张力为0.012 m N/m,且黏度与油藏原油黏度(3.4 m Pa·s)相近。LST溶液具有较好的油水乳化能力,可改善油藏水润湿性。在47.2℃、油水比为1∶1的条件下,LST乳状液的稳定时间为120 min。岩心经LST溶液处理后,水相接触角由57.0°降至12.5°,油相接触角由24.3°增至38.6°。LST溶液具有良好的静态抗吸附性能,经岩心3次吸附后,LST残液与原油间的界面张力仍能达到10^(-2)m N/m数量级,黏度达2.895 m Pa·s,乳状液静置10、120 min的析水率分别为38.6%、73.4%。LST溶液的耐盐性能较好。在矿化度为16570 mg/L的环境下,其油水界面张力低于7×10^(-2)m N/m、黏度为3.06 m Pa·s。LST溶液的驱油效果较好,可有效封堵高渗透孔道,启动低渗透孔道残余油。注入0.4 PV 0.4%LST溶液可使均质岩心(0.05μm^(2))的水驱驱油效率提高11.21百分点,非均质岩心(级差3~10)水驱后的综合采收率提高6.55百分点~19.41百分点。LST溶液可以实现低剂量或低成本有效提高水驱采收率,在低渗透非均质油藏化学驱提高采收率方面具有较好的应用前景。
文摘In order to determine the low interfacial tension,a spinning drop interfacial tensiometer was constructed.The apparatus was calibrated by measuring the interfacial tension of some low molecular weight systems and polyethylene glycol /dextran aqueous two-phase systems,with the determination error of 3.The interfacial tensions of PEG1000/Na2SO4,PEG/MgSO4 and PEG1000/(NH4)2SO4 aqueous two-phase systems Were determined.It is found that the salt type has strong effect on the interfacial tension.
