聚表二元驱配方的室内研究及其对原油乳状液稳定性的影响
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摘要
本文介绍了聚表二元驱的发展及研究现状,驱油剂对原油乳状液稳定性影响的研究现状、研究进展,以及原油乳状液的形成、稳定和破乳。针对孤岛油田水驱进入开发后期,对三次采油中的聚表二元驱配方展开了室内研究;但是二元驱的注入使得采出液破乳比较困难,为了下一步的地面工艺处理做好充分的准备,因此,还研究了驱油剂对原油乳状液的稳定性影响规律,以及通过界面张力、电导率、透光率和zeta电位对其界面性质进行了研究,以寻求适宜聚表二元驱采出液的破乳条件。
室内实验确定了盛立HPAM与吡咯啉二元复合体系,复配比为3:1,使用浓度为3600 mg·L-1。该复合体系在50℃时粘度为102.50 mPa·s,与原油界面张力为1.99×10-2 mN·m-1。经过室内的性能评价,此复合体系具有较好的耐温、耐盐等性能。实验中还对比了本文研制的盛立复合体系与胜利油田采油院研制的万达HPAM与吡咯啉复合体系,结果表明盛立二元复合体系主要性能均优于万达复合体系,在三次采油领域具有很好的应用前景。
对于孤岛外输原油和模拟二元驱采出液,破乳效果较好的破乳剂均为BSE-238和BSE-401。在加入破乳剂的条件下,研究了驱油剂对原油乳状液稳定性的影响规律。实验结果表明,单一的表面活性剂和聚合物的加入,脱水率减小,原油乳状液的稳定性增强。两种驱油剂之间有明显的协同作用,明显地增加了原油乳状液的稳定性,脱水率最低。模拟二元驱采出液的破乳条件:适宜的温度为60℃,BSE-238浓度为50 mg·L-1,加入酸和盐的浓度同为100 mg·L-1,最终脱水率为84.85%。而对没有加入驱油剂的原油乳状液,在相同条件下,其最终脱水率为93.33%。
In this paper, we introduce the development and research of polymer-surfactant dual-compound system, study on the influence of oil displacement agents on the stability of crude oil emulsions, the formation,stability and demulsification of crude oil emulsion. According to water flooding into later developing period for Gudao oilfield, we studied the polymer-surfactant dual-compand system in lab. However, demulsification of produced fluid became difficulty due to pouring in dual-compound system as oil displacement agent.The effect of oil displacement agents on crude oil emulsion stability were also studied for the sake of further ground processing readily. In order to find out appropriate condition for polymer-surfactant dual-compound produced fluid, the effect of oil displacement agents on crude oil emulsion stability was characterized through oil/water interfacial tension,interfacial shear viscosity, Zeta potential and so on.
Sheng Li HPAM and pyrroline dual-compound system was determined in laboratory, and the complex ratio was 3:1, the concentration was 3600 mg·L-1.The viscosity of dual-compound system was 102.5 mPa·s, and the interfacial tension with crude oil was 1.99×10-2 mN.m-1 at 50℃.The indoor performance evaluation indicated that the dual-compound system had good temperature and salt resistance, and other properties. Sheng Li HPAM and pyrroline dual-compound system was in contrast to Wanda HPAM and pyrroline dual-compound system produced by Shengli Academe, the results show that Sheng Li dual-compound system performance was superior to Wanda composite system, which will have good prospects of application in tertiary oil recovery area.
For Gudao crude oil and imitated produced liquid, both the demulsifier BSE-238 and BSE-401 have the better effect. We studied the trend of the oil displacement agent’s influence on the crude oil emulsion’s stability. The experimental result suggested that the addition of single oil displacing agent (surfactant or polymer) decreased the dehydration rate and strengthened the stability of crude oil emulsion. While two kinds of oil displacement agents had obvious synergistic effect which could obviously increase the stability of the crude oil emulsion and make the system have the lowest dehydration rate. The demulsifying condition of the simulation of the binary system flooding was as following, the optimum temperature is 60℃, the concentration of BSE-238 is 50 mg·L-1, the concentration of the acid and the salt is 100 mg·L-1, the final dehydration rate is 84.85%, while the final dehydration rate is 93.33% for crude oil emulsion without oil displacement agent.
室内实验确定了盛立HPAM与吡咯啉二元复合体系,复配比为3:1,使用浓度为3600 mg·L-1。该复合体系在50℃时粘度为102.50 mPa·s,与原油界面张力为1.99×10-2 mN·m-1。经过室内的性能评价,此复合体系具有较好的耐温、耐盐等性能。实验中还对比了本文研制的盛立复合体系与胜利油田采油院研制的万达HPAM与吡咯啉复合体系,结果表明盛立二元复合体系主要性能均优于万达复合体系,在三次采油领域具有很好的应用前景。
对于孤岛外输原油和模拟二元驱采出液,破乳效果较好的破乳剂均为BSE-238和BSE-401。在加入破乳剂的条件下,研究了驱油剂对原油乳状液稳定性的影响规律。实验结果表明,单一的表面活性剂和聚合物的加入,脱水率减小,原油乳状液的稳定性增强。两种驱油剂之间有明显的协同作用,明显地增加了原油乳状液的稳定性,脱水率最低。模拟二元驱采出液的破乳条件:适宜的温度为60℃,BSE-238浓度为50 mg·L-1,加入酸和盐的浓度同为100 mg·L-1,最终脱水率为84.85%。而对没有加入驱油剂的原油乳状液,在相同条件下,其最终脱水率为93.33%。
In this paper, we introduce the development and research of polymer-surfactant dual-compound system, study on the influence of oil displacement agents on the stability of crude oil emulsions, the formation,stability and demulsification of crude oil emulsion. According to water flooding into later developing period for Gudao oilfield, we studied the polymer-surfactant dual-compand system in lab. However, demulsification of produced fluid became difficulty due to pouring in dual-compound system as oil displacement agent.The effect of oil displacement agents on crude oil emulsion stability were also studied for the sake of further ground processing readily. In order to find out appropriate condition for polymer-surfactant dual-compound produced fluid, the effect of oil displacement agents on crude oil emulsion stability was characterized through oil/water interfacial tension,interfacial shear viscosity, Zeta potential and so on.
Sheng Li HPAM and pyrroline dual-compound system was determined in laboratory, and the complex ratio was 3:1, the concentration was 3600 mg·L-1.The viscosity of dual-compound system was 102.5 mPa·s, and the interfacial tension with crude oil was 1.99×10-2 mN.m-1 at 50℃.The indoor performance evaluation indicated that the dual-compound system had good temperature and salt resistance, and other properties. Sheng Li HPAM and pyrroline dual-compound system was in contrast to Wanda HPAM and pyrroline dual-compound system produced by Shengli Academe, the results show that Sheng Li dual-compound system performance was superior to Wanda composite system, which will have good prospects of application in tertiary oil recovery area.
For Gudao crude oil and imitated produced liquid, both the demulsifier BSE-238 and BSE-401 have the better effect. We studied the trend of the oil displacement agent’s influence on the crude oil emulsion’s stability. The experimental result suggested that the addition of single oil displacing agent (surfactant or polymer) decreased the dehydration rate and strengthened the stability of crude oil emulsion. While two kinds of oil displacement agents had obvious synergistic effect which could obviously increase the stability of the crude oil emulsion and make the system have the lowest dehydration rate. The demulsifying condition of the simulation of the binary system flooding was as following, the optimum temperature is 60℃, the concentration of BSE-238 is 50 mg·L-1, the concentration of the acid and the salt is 100 mg·L-1, the final dehydration rate is 84.85%, while the final dehydration rate is 93.33% for crude oil emulsion without oil displacement agent.
引文
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[6] Delamaide E.The Success of Two Pilot Initiates First Extention of Polymer Injection in a Jiant Field[J].SPE/DOE 27819,1994:541-548
[7] Taylor K C.Water-Soluble Hydrophobically Associating Polymers for Improved Oil Recovery[J].SPE 29008,1995:625-631
[8]周润才.表面活性剂/聚合物驱油的基本原理[J].国外油气田工程,1995,10(4):9-12
[9]彭国峰,赵田红,陈翠花,等.驱油用水溶性聚合物的研究进展[J].化学工程师,2005,12(3):36-39
[10]侯吉瑞.化学驱原理与应用[M].第一版.北京:石油工业出版社,1998:64-71
[11]赵福麟.采油化学[M].第一版.山东东营:石油大学出版社,1989:1-33
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[13]朱友益,沈平平.三次采油复合驱用表面活性剂合成性能及应用[M].第一版.北京:石油工业出版社,2002,33-34
[14]宋瑞国,梁成浩,张志军,等.三次采油用表面活性剂体系的发展趋势及展望[J].内蒙古石油化工,2006,12(3):193-195
[15]康万利.大庆油田三元复合驱化学剂作用机理研究[M].第一版.北京:石油工业出版社,2001:45-33
[16]刘海波.聚合物/表面活性剂二元复合驱室内驱油试验研究[D].大庆石油学院硕士学位论文,2007:2
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[19]Raimondi Pet al.Alkaline Water Flooding Design and Implementation of a Field Pilot[J].J.pet.Tech.1977,(10):59-68
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[21]Somerton W.H.and Radke C.J.Role of Clays in the Enhanced Recovery of PetroleumFrom Some California Sands[J].J.Pet.Tech.1983,(3):43-54
[22]陈凌云.聚合物粘弹性及体系的界面张力对驱油效率的影响的试验研究[D].大庆石油学院硕士学位论文,2002:10-12
[23]李孟涛.聚合物/表面活性剂二元复合驱室内驱油试验研究[D].大庆石油学院硕士学位论文,2003:25-38
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[25]李柏林,程杰成.二元无碱驱油体系研究[J].油气地面工程,2004,23(6):16-17
[26]杨艳,蒲万芬,刘永兵.NNMB/NAPS二元体系与原油界面张力[J].西南石油学院学报,2006,28(1):68-71
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