一种核-壳缔合聚合物的高效驱油特性研究
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摘要
油田产出水直接配注聚合物是聚合物驱的发展趋势和必然,基于提升聚合物在产出水中的综合驱油性能的多级结构和超分子效应的思路,以聚酰胺-胺改性并功能化的纳米二氧化硅为核,甲基-N,N-二辛基丙烯酰胺为疏水单体制备水溶性核-壳形缔合聚合物SHPAM;IR、~1H NMR、SEM和TEM表征SHPAM的结构。SHPAM的核-壳结构及疏水基团的缔合效应协同增强高矿化度产出水配制聚合物溶液的增黏性、抗剪切性及长期稳定性能,SHPAM的零剪切黏度是梳形聚合物(KYPAM)的60倍。SHPAM比KYPAM少500 mg·L~(-1),SHPAM有更强的流度控制性能,对岩心渗透率有良好的兼容性;水驱至含水率98%,0.30 PV的SHPAM驱(浓度1500 mg·L~(-1))提高原油采收率达25%。结果表明产出水配注SHPAM表现高效的驱油效率。
The development of polymer-based process requires that polymer solution should be directly prepared with oil-field produced water.In order to improve the comprehensive displacement properties of polymer solution that prepared with high salinity oilfield produced water,a novel core-shell like associative polyacrylamide(SHPAM)was prepared by a facile water-radical polymerization strategy based on the functional nano-silica and twin-alkyl hydrophobic monomer.The structure and morphology of SHPAM were characterized using IR,1 H NMR,SEM and TEM.The rigid core together with the supramolecular behavior of hydrophobic moieties of SHPAM gave rise to desirable thickening efficiency,anti-shear performance and long stability,and the zero-viscosity of SHPAM is 60 times higher than that of the comb-like polymer(KYPAM)at identical polymer concentration.The core flooding experiments indicated that SHPAM had more outstanding mobility control capability even through 500 mg·L~(-1) less of SHPAM was employed in comparison to KYPAM.Moreover,SHPAM had benign compatible with variable permeability of conglomerate cores.After the earlier water flooding with the water cut of higher than 98%0.3 pore volume of SHPAM with the concentration of 1500 mg·L~(-1) and the chase water flooding could enhance 25%oil recovery of original oil in place.The results implied that SHPAM that directly prepared with high salinity oilfield produced water might have robust application for enhancing oil recovery.
The development of polymer-based process requires that polymer solution should be directly prepared with oil-field produced water.In order to improve the comprehensive displacement properties of polymer solution that prepared with high salinity oilfield produced water,a novel core-shell like associative polyacrylamide(SHPAM)was prepared by a facile water-radical polymerization strategy based on the functional nano-silica and twin-alkyl hydrophobic monomer.The structure and morphology of SHPAM were characterized using IR,1 H NMR,SEM and TEM.The rigid core together with the supramolecular behavior of hydrophobic moieties of SHPAM gave rise to desirable thickening efficiency,anti-shear performance and long stability,and the zero-viscosity of SHPAM is 60 times higher than that of the comb-like polymer(KYPAM)at identical polymer concentration.The core flooding experiments indicated that SHPAM had more outstanding mobility control capability even through 500 mg·L~(-1) less of SHPAM was employed in comparison to KYPAM.Moreover,SHPAM had benign compatible with variable permeability of conglomerate cores.After the earlier water flooding with the water cut of higher than 98%0.3 pore volume of SHPAM with the concentration of 1500 mg·L~(-1) and the chase water flooding could enhance 25%oil recovery of original oil in place.The results implied that SHPAM that directly prepared with high salinity oilfield produced water might have robust application for enhancing oil recovery.
引文
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[2]蒲万芬,闫召鹏,刘锐,等.一种超支化疏水缔合聚合物的制备与性能评价[J].化学研究与应用,2015(5):589-594.
[3]崔平,马俊涛,黄荣华.疏水缔合水溶性聚合物溶液性能研究进展[J].化学研究与应用,2002,14(4):377-382.
[4]苟绍华,尹婷,叶仲斌,等.耐高温水溶性AM/AA/TC-AP共聚物的合成及性能研究[J].化学研究与应用,2013,25(12):1711-1716.
[5]陈锡荣,黄凤兴.驱油用耐温抗盐水溶性聚合物的研究进展[J].石油化工,2009(10):1132-1137.
[6]聂春红,王宝辉.聚合物驱油田采出水处理工艺新技术[J].现代化工,2011,31(6):86-87.
[7]伊卓,杨付林,刘希,等.中低渗透高温高盐油藏驱油共聚物 P(AM/AMPSNa/AANa)的合成及性能[J].应用化学,2015,32(5):519-526.
[8]Seright R S,Campbell A,Mozley P,et al.Stability of partially hydrolyzed polyacrylamides at elevated temperatures in the absence of divalent cations[J].SPE J,2010,15(02):341-348.
[9]叶仲斌,王星媛,舒政.剪切作用对聚合物溶液流体力学半径分布特征的影响研究[J].化学研究与应用,2016,28(9):1268-1274.
[10]罗健辉,卜若颖.驱油用抗盐聚合物KYPAM的应用情况[J].油田化学,2002,19(1):64-67.
[11]郭旭光,袁士义,沈平平,等.梳形抗盐聚合物的现场试验进展[J].石油钻采工艺,2004,26(5):80-81.
[12]赖南君,彭琴,叶仲斌,等.水溶性驱油剂AM/AA/NVP/EDMA的合成及性能[J].化学研究与应用,2014(1):81-85.
[13]Pu W,Liu R,Wang K,et al.Water-soluble core–shell hyperbranched polymers for enhanced oil recovery[J].Ind Eng Chem Res,2015,54(3):798-807.
[14]赖南君,张艳,赵旭斌,等.超支化聚合物在多孔介质上的吸附滞留特征[J].化学研究与应用,2016,28(3):360-365.
[15]Liu R,Pu W,Du D.Synthesis and characterization of core-shell associative polymer that prepared with oilfield formation water for polymer flooding[J].J Ind Eng Chem,2017,46:80-90.
[16]Maghzi A,Kharrat R,Mohebbi A,et al.The impact of silica nanoparticles on the performance of polymer solution in presence of salts in polymer flooding for heavy oil recovery[J].Fuel,2014,123:123-132.
[17]Liu R,Pu W,Sheng J J,et al.Star-like hydrophobically associative polyacrylamide for enhanced oil recovery:Comprehensive properties in harsh reservoir conditions[J].J Taiwan Inst Chem E,2017,80:639-649.
[18]Dobrynin A V,Colby R H,Rubinstein M.Scaling theory of polyelectrolyte solutions[J].Macromol,1995,28(6):1859-1871.
[19]Howe A M,Clarke A,Giernalczyk D.Flow of concentrated viscoelastic polymer solutions in porous media:effect of MW and concentration on elastic turbulence onset in various geometries[J].Soft matter,2015,11(32):6419-6431.