高含水高温油藏W/O型乳化剂OB-2性能评价及驱油研究
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摘要
针对如何在水驱后进一步开发高含水高温油藏,提出了一种表面活性剂就地乳化驱油技术,对油包水(W/O)型乳化剂OB-2体系进行了乳化特性评价及乳状液驱油研究。研究结果表明,随着乳化剂浓度增大,乳液黏度先增大后减小;对于X油藏原油,乳化剂最佳浓度为0.3wt%,在此浓度下,油水界面张力可降低至10-2m N/m数量级;在水油体积比低于7∶3时,乳化剂OB-2可促使油水两相完全乳化,形成高黏度的W/O型乳液,其中,水油体积比为7∶3时乳液黏度最大,增黏率高达370%。岩心驱油实验结果表明,均质条件下,水驱后注入0.3PV乳化剂OB-2体系,可提高原油采收率达26.15%;非均质条件下,该乳化体系可在级差低于7.6时表现出良好的流度控制及非均质调控能力,扩大波及体积。
Aimed at how to develop high temperature reservoir after water flooding, we proposed the in-situ emulsion flooding by injecting surfactant solutions to evaluate the emulsifying property and study on the oil displacement by the emulsion of the OB-2 system for the W/O(water in oil)emulsifier. The results showed that the emulsion viscosity firstly increased and then decreased along with emulsifier concentration. For oil in reservoir-X, the optimal emulsifier concentration was 0.3 wt% at which could make the interfacial tension reduce to 10-2 mN/m order of magnitude. When the water-oil ratio was lower than 7∶3, the complete emulsification of oil-water happened and the W/O emulsion with high viscosity would form. The maximum emulsion viscosity appearde when the oil-water ratio was 7∶3, with the viscosity increasing rate of as high as 370 %. The results of emulsion flooding indicated that the recovery factor of the homogeneous core could increase another 26.15 % after water flooding by injecting 0.3 PV OB-2 system. On the other hand, when the permeability ratio of parallel cores was lower than 7.6, applying the OB-2 system could achieve good mobility control and heterogeneity regulation.
Aimed at how to develop high temperature reservoir after water flooding, we proposed the in-situ emulsion flooding by injecting surfactant solutions to evaluate the emulsifying property and study on the oil displacement by the emulsion of the OB-2 system for the W/O(water in oil)emulsifier. The results showed that the emulsion viscosity firstly increased and then decreased along with emulsifier concentration. For oil in reservoir-X, the optimal emulsifier concentration was 0.3 wt% at which could make the interfacial tension reduce to 10-2 mN/m order of magnitude. When the water-oil ratio was lower than 7∶3, the complete emulsification of oil-water happened and the W/O emulsion with high viscosity would form. The maximum emulsion viscosity appearde when the oil-water ratio was 7∶3, with the viscosity increasing rate of as high as 370 %. The results of emulsion flooding indicated that the recovery factor of the homogeneous core could increase another 26.15 % after water flooding by injecting 0.3 PV OB-2 system. On the other hand, when the permeability ratio of parallel cores was lower than 7.6, applying the OB-2 system could achieve good mobility control and heterogeneity regulation.
引文
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[15]Z.H.Ren,Y.Luo.Dynamic interfacial tension behavior of alkyl amino sulfonate in crude oil-brine system[J].Tenside Surfactants Detergents,2013,50(5):369-375.
[16]蒲万芬,唐艳丽,赵田红.驱油用表面活性剂的乳化性能研究[J].油气藏评价与开发,2017,7(4):41-45.
[17]孙琳,蒲万芬,吴雅丽,等.表面活性剂高温乳化性能研究[J].油田化学,2011,28(3):275-279.
[2]元福卿,赵方剑,夏晞冉,等.胜坨油田二区沙二段3砂组高温高盐油藏低张力氮气泡沫驱单井试验[J].油气地质与采收率,2014,21(1):70-73.
[3]方吉超,戴彩丽,由庆,等.塔中402CⅢ高温高盐油藏泡沫驱实验研究[J].油气地质与采收率,2014,21(4):84-88.
[4]赵国柱,金仁高,李圣涛,等.高温高盐油藏甜菜碱型表面活性剂TCJ-5的性能及应用[J].东北石油大学学报,2015,39(3):111-117.
[5]任朝华,张先超,尤万里,等.乳化剂HC-5的性能及驱油效果[J].油田化学,2015,32(4):554-558.
[6]Mcauliffe C D.Oil-in-water emulsions and their flow properties in porous media[J].Journal of Petroleum Technology,1973,25(6):727-733.
[7]M S Karambeigi,R Abbassi,E Roayaei,et al.Emulsion flooding for enhanced oil recovery:Interactive optimization of phase behavior,microvisual and core-flood experiments[J].Journal of Industrial and Engineering Chemistry,2015,29(2):382-391.
[8]A Mehranfar,M H Ghazanfari.Investigation of the microscopic displacement mechanisms and macroscopic behavior of alkaline flooding at different wettability conditions in shaly glass micromodels[J].Journal of Petroleum Science and Engineering,2014,122:595-615.
[9]L Chen,G Zhang,J Ge,et al.Research of the heavy oil displacement mechanism by using alkaline/surfactant flooding system[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2013,43(19):63-71.
[10]M Dong,Q Liu,A Li.Displacement mechanisms of enhanced heavy oil recovery by alkaline flooding in a micromodel[J].Particuology,2012,10(3):298-305.
[11]宣英龙,杨雪白,秦笃国,等.扶余原油乳化生成条件与驱油机理[J].油田化学,2016,33(2):300-304.
[12]周亚洲,殷代印,曹睿.高含水后期乳状液的驱油效果与作用机理分析[J].油田化学,2016,33(2):285-290.
[13]田茂章,赵新,宋新民,等.低渗透油藏中油包水乳液的生成及其扩大波及体积的作用[J].应用化工,2015,44(8):1421-1426.
[14]任朝华,罗跃,陈大钧.新型表面活性剂体系降低原油/水的界面张力行为[J].油田化学,2011,28(4):423-426.
[15]Z.H.Ren,Y.Luo.Dynamic interfacial tension behavior of alkyl amino sulfonate in crude oil-brine system[J].Tenside Surfactants Detergents,2013,50(5):369-375.
[16]蒲万芬,唐艳丽,赵田红.驱油用表面活性剂的乳化性能研究[J].油气藏评价与开发,2017,7(4):41-45.
[17]孙琳,蒲万芬,吴雅丽,等.表面活性剂高温乳化性能研究[J].油田化学,2011,28(3):275-279.