乳液型聚合凝胶调驱体系性能评价
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摘要
为了提高海上油田的驱油效率、满足海上平台作业要求,通过测定乳液型聚合物溶液和凝胶体系的黏度随时间的变化,得到适合海上油田深部调驱的乳液型聚合物凝胶体系;通过长度为1 m的填砂模型封堵实验和均质岩心驱油实验,研究乳液型聚合物凝胶的封堵性和驱油效果。结果表明,乳液型聚合物的稳定性较好,溶液放置31 d后的黏度保留率为71.15%。由两种酚醛类交联剂和乳液型聚合物组成的聚合物凝胶成胶时间为8 d,成胶黏度为911 mPa·s,稳定性良好。水驱和聚合物驱注入速率为5 m/d时,填砂模型封堵效果相对较好,沿程封堵率均超过90%。岩心驱油实验中,渗透率5000×10~(-3)μm~2岩心的采出程度增幅比渗透率为1000×10~(-3)μm~2和3000×10~(-3)μm~2的岩心高12.46%和3.83%,聚合物凝胶体系可以进入油藏深部实现高渗条件下的深部调驱,改善水驱效果。图4表4参19
In order to improve the oil displacement efficiency of offshore oilfields and meet the operational requirements of offshore platforms,an emulsion polymer gel system suitable for deep flooding of offshore oilfields was obtained by measuring the viscosity of emulsion polymer solution and gel system with time. The sealing performance and oil displacement effect of the emulsion polymer gel were studied by a sand-filling model plugging experiment with a length of 1 m and a homogeneous core flooding experiment. The results showed that the stability of the emulsion polymer was good,and the viscosity retention was 71.15% after the solution was placed for 31 days. The polymer gel consisting of two phenolic cross-linking agents and an emulsion polymer had a gelation time of 8 days and a gelling viscosity of 911 mPa·s indicating good stability. When the injection rate of water flooding and polymer flooding was 5 m/d,the plugging effect of the sand filling model was relatively good,and the plugging rate along the sand pack was more than 90%. In the core flooding experiment,the recovery degree increment of the core with a permeability of 5000×10~(-3)μm~2 was 12.46% and 3.83% higher than that of 1000×10~(-3)μm~2 and 3000×10~(-3)μm~2. Therefore,the polymer gel system could enter the deep part of the reservoir to achieve deep adjustment and drive under high permeability conditions,and improve the effect of water flooding.
In order to improve the oil displacement efficiency of offshore oilfields and meet the operational requirements of offshore platforms,an emulsion polymer gel system suitable for deep flooding of offshore oilfields was obtained by measuring the viscosity of emulsion polymer solution and gel system with time. The sealing performance and oil displacement effect of the emulsion polymer gel were studied by a sand-filling model plugging experiment with a length of 1 m and a homogeneous core flooding experiment. The results showed that the stability of the emulsion polymer was good,and the viscosity retention was 71.15% after the solution was placed for 31 days. The polymer gel consisting of two phenolic cross-linking agents and an emulsion polymer had a gelation time of 8 days and a gelling viscosity of 911 mPa·s indicating good stability. When the injection rate of water flooding and polymer flooding was 5 m/d,the plugging effect of the sand filling model was relatively good,and the plugging rate along the sand pack was more than 90%. In the core flooding experiment,the recovery degree increment of the core with a permeability of 5000×10~(-3)μm~2 was 12.46% and 3.83% higher than that of 1000×10~(-3)μm~2 and 3000×10~(-3)μm~2. Therefore,the polymer gel system could enter the deep part of the reservoir to achieve deep adjustment and drive under high permeability conditions,and improve the effect of water flooding.
引文
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[2]宋考平,杨二龙,王锦梅,等.聚合物驱提高驱油效率机理及驱油效果分析[J].石油学报,2004,25(3):71-74.
[3]曹瑞波,韩培慧,高淑玲.不同驱油剂应用于聚合物驱油后油层的适应性分析[J].特种油气藏,2012,19(4):100-103.
[4]赵秀娟,王传军.弱凝胶调驱微观渗流机理研究[J].油田化学,2004,21(1):56-60.
[5]白延锋,段斌峰,王滔,等.弱凝胶调驱提高采收率技术研究与矿场应用[J].化学工程与装备,2011(3):88-91.
[6]孙焕泉,王涛,肖建洪,等.新型聚合物微球逐级深部调剖技术[J].油气地质与采收率,2006,13(4):77-79.
[7]李先杰,侯吉瑞,岳湘安,等.剪切与吸附对弱凝胶深部调驱作用的影响[J].中国石油大学学报(自然科学版),2007,31(6):147-151.
[8]王代流,肖建洪.交联聚合物微球深部调驱技术及其应用[J].油气地质与采收率,2008,15(2):86-88.
[9]罗云,罗文利,王强,等.高温高盐可动凝胶配方研究与应用[J].西南石油大学学报(自然科学版),2016,38(2):149-154.
[10]庹维志. N油田深部调驱体系性能评价[D].大庆:东北石油大学,2015:27-53.
[11]金海龙.低毒性弱凝胶调驱提高采收率技术研究[D].成都:西南石油大学,2006:37-39.
[12]杜玉洪,吴行才,陈洪,等.可动凝胶调驱技术在普通稠油油藏中的应用[J].西南石油大学学报(自然科学版),2008,30(3):97-101.
[13]贺杰,岳湘安,丁名臣,等.多孔介质中弱凝胶运移封堵特征[J].油田化学,2015,32(2):190-194.
[14]王健,张庆,王丹翎,等.用于海外河油田调驱的有机铬交联聚合物弱凝胶体系及性能评价[J].油田化学,2016,33(3):437-441.
[15]张艳芳,罗跃,张建国,等.弱凝胶驱油体系的研究进展[J].精细石油化工进展,2003,4(6):45-48.
[16]朱怀江,刘玉章,绳德强,等.弱凝胶对油水相对渗透率的影响[J].石油学报,2002,23(3):69-72.
[17]王平美,罗健辉,李宇乡,等.弱凝胶调驱体系在岩心试验中的行为特性研究[J].石油钻采工艺,2000,22(5):48-50.
[18]王克亮,孔辉,付国强,等.部分水解聚丙烯酰胺/乳酸铬在油田污水条件下的成胶特性研究[J].油田化学,2016,33(2):240-243.
[19]刘义刚,徐文江,姜维东.海上油田调驱技术研究与实践[J].石油科技论坛,2014,33(3):41-44.