成膜性纳米微乳液封堵剂的制备与评价
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摘要
以苯乙烯(St)、丙烯酸甲酯(MA)和丙烯酰胺(AM)为反应单体,偶氮二异丁腈为引发剂,采用反相微乳液聚合法,合成了成膜型纳米微乳液封堵剂。合成反应的最佳条件为:乳化剂复配比span80∶tween80=2∶1(质量比),反应单体配比为St∶MA∶AM=3∶1∶2(质量比),单体总浓度为25%,引发剂用量为2%,反应温度60℃,反应时间4 h。封堵剂的粒径中值为125.5 nm,满足对页岩微裂缝封堵的尺寸条件;热重分析表明,纳米封堵剂分解温度290℃左右,热稳定性好;在钻井液体系中加入3%的封堵剂,90℃热滚16 h后,粘度和切力变化不大,流变性较稳定,且其API滤失量仅为2 m L,FLHTHP(30 min)为6.0 m L,该纳米封堵剂性能优异,封堵效果好。
Styrene( St),methyl acrylate( MA) and acrylamide( AM) were used as reaction monomers,and azodiisobutyronitrile was used as initiator,the microemulsion plugging agent was synthesized by reverse microemulsion polymerization. The best condition of synthetic reaction were as follows: fixed the emulsifier ratio of span80∶ tween80 was 2∶ 1,the mass ratio of St∶ MA∶ AM was 3∶ 1∶ 2,the total monomer concentration was 25%,the amount of initiator was 2% based on total monomers mass,the reaction temperature was 60 ℃,the reaction time was 4 h,the median diameter of the plugging agent was 125. 5 nm,which meets the requirements of plugging the microcracks of shale; the decomposition temperature of nano plugging agent was about 290 ℃,and the thermal stability is good. After adding 3% of the plugging agent into the drilling fluid system,90 ℃ hot roll 16 h,the viscosity and shearing force changed little and the rheological property was stable,and the loss of API was only 2 m L,its FLHTHP( 30 min)was 6. 0 m L. The nano plugging agent had excellent performance and good plugging effect.
Styrene( St),methyl acrylate( MA) and acrylamide( AM) were used as reaction monomers,and azodiisobutyronitrile was used as initiator,the microemulsion plugging agent was synthesized by reverse microemulsion polymerization. The best condition of synthetic reaction were as follows: fixed the emulsifier ratio of span80∶ tween80 was 2∶ 1,the mass ratio of St∶ MA∶ AM was 3∶ 1∶ 2,the total monomer concentration was 25%,the amount of initiator was 2% based on total monomers mass,the reaction temperature was 60 ℃,the reaction time was 4 h,the median diameter of the plugging agent was 125. 5 nm,which meets the requirements of plugging the microcracks of shale; the decomposition temperature of nano plugging agent was about 290 ℃,and the thermal stability is good. After adding 3% of the plugging agent into the drilling fluid system,90 ℃ hot roll 16 h,the viscosity and shearing force changed little and the rheological property was stable,and the loss of API was only 2 m L,its FLHTHP( 30 min)was 6. 0 m L. The nano plugging agent had excellent performance and good plugging effect.
引文
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[2]张金川,金之钧,袁明生.页岩气成藏机理和分布[J].天然气工业,2004,24(7):15-18.
[3]徐建永,武爱俊.页岩气发展现状及勘探前景[J].特种油气藏,2010,17(5):1-7.
[4]Tan C P,Mohammed A,Mody F K,et al.Novel high membrane efficiency water-based drilling fluids for alleviating problems in trouble some shale formations[J].Journal of Economic Theory,2002,24(3):398-412.
[5]闫丽丽,李丛俊,张志磊,等.基于页岩气“水替油”的高性能水基钻井液技术[J].钻井液与完井液,2015,32(5):1-6.
[6]Fuh G F,Beardmore D H,Morita N.Further development,field testing,and application of the wellbore strengthening technique for drilling operations[C]//Society of Petroleum Engineers.SPE 105809,2007.
[7]赵勇,何炳林,哈润华.乳化剂对丙烯酰胺反相微乳液共聚合的影响[J].应用化学,2000,17(2):168-170.
[8]Zou H,Wu S,Shen J.Chem Inform abstract:polymer/silica nanocomposites:preparation,characterization,properties,and applications[J].Chemical Reviews,2008,108(9):3893.
[9]Fielding L A,Tonnar J,Armes S P.All-acrylic film-forming colloidal polymer/silica nanocomposite particles prepared by aqueous emulsion polymerization[J].Langmuir the Acs Journal of Surfaces&Colloids,2011,27(17):11129-11144.
[10]张浩勤,孟晓红,邱建华,等.丙烯酰胺/对苯乙烯磺酸钠的反相微乳液聚合[J].郑州大学学报:工学版,2009,30(3):110-114.