一种新型温控变黏酸体系的研究
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摘要
根据地层温度随深度升高而升高的特点,以聚合物与表面活性剂Biggs三阶段模型为理论基础,由BCG-5稠化剂、HB-2缓蚀剂、NC-1活性剂构成了一种变黏酸体系,该体系低温低黏度,随温度升高表观黏度增大。对比了不同稠化剂浓度的增黏能力,测试了活性剂含量对体系温控变黏性能的影响,优选了缓蚀剂的型号与含量。结果表明,室温下该体系的表观黏度为29 mPa·s,在90℃下加热20 min后表观黏度逐步上升到250 mPa·s,100℃下仍具有变黏能力,缓蚀率可达到90.1%,与岩屑反应后表观黏度下降至5 mPa·s,表面张力为20 mN/m,有利于提高施工的供液能力、降低摩阻、深部酸化及酸压。
A variable viscosity acid was formulated with a viscosifier BCG-5, a corrosion inhibitor HB-2 and an active agent NC-1.This acid, formulated on the theoretical basis of the Biggs' three-stage model describing the reaction between polymer and surfactant,shows low apparent viscosity at low temperature, and shows high apparent viscosity at high temperature. Since formation temperature increases with depth, this acid, when injected into the formation, will show low viscosity in shallow depth and high viscosity in deep depth. Laboratory experiments have been conducted to compare the viscosifying capacity of different thickening agents, test the effects of the content of the active agent on the viscosifying of the acid under the control of temperature, and optimize the type and concentration of the corrosion inhibitor. It was found that the apparent viscosity of the acid was 29 mPa·s at room temperature, and gradually increased to 250 mPa·s after being heated at 90 ℃ for 20 min. At 100 ℃, the acid still had ability to change its viscosity. The corrosion rate of this acid was retarded by 90.1%. The apparent viscosity of the acid was reduced to 5 mPa·s after reaction with rocks,and the surface tension of the acid became 20 mN/m, which is helpful to increasing the flow conductivity, reducing friction and drag and performing in-depth acidizing and acid-fracturing.
A variable viscosity acid was formulated with a viscosifier BCG-5, a corrosion inhibitor HB-2 and an active agent NC-1.This acid, formulated on the theoretical basis of the Biggs' three-stage model describing the reaction between polymer and surfactant,shows low apparent viscosity at low temperature, and shows high apparent viscosity at high temperature. Since formation temperature increases with depth, this acid, when injected into the formation, will show low viscosity in shallow depth and high viscosity in deep depth. Laboratory experiments have been conducted to compare the viscosifying capacity of different thickening agents, test the effects of the content of the active agent on the viscosifying of the acid under the control of temperature, and optimize the type and concentration of the corrosion inhibitor. It was found that the apparent viscosity of the acid was 29 mPa·s at room temperature, and gradually increased to 250 mPa·s after being heated at 90 ℃ for 20 min. At 100 ℃, the acid still had ability to change its viscosity. The corrosion rate of this acid was retarded by 90.1%. The apparent viscosity of the acid was reduced to 5 mPa·s after reaction with rocks,and the surface tension of the acid became 20 mN/m, which is helpful to increasing the flow conductivity, reducing friction and drag and performing in-depth acidizing and acid-fracturing.
引文
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[2]刘炜,张斌,常启新,等.胶凝酸体系的性能研究及应用[J].精细石油化工进展,2013,14(1):12-14.LIU Wei,ZHANG Bin,CHANG Qixin,et al.Properties and application of gelling acid system[J].Advances in Fine Petrochemicals,2013,14(1):12-14.
[3]徐杏娟,刘音,付月永,等.高温碳酸盐岩酸化用胶凝酸体系研究[J].石油天然气学报,2014(11):197-200.XU Xingjuan,LIU Yin,FU Yueyong,et al.Gelling acid system for acidizing of high temperature carbonate rocks[J].Journal of Oil and Gas Technology,2014(11):197-200.
[4]赵增迎,杨贤友,周福建,等.转向酸化技术现状与发展趋势[J].大庆石油地质与开发,2006,25(2):68-71.ZHAO Zengying,YANG Xianyou,ZHOU Fujian,et al.Status and development trend of steering acidizing technology[J].Petroleum Geology&Oilfield Development in Daqing,2006,25(2):68-71.
[5]王艳丽.新型高性能转向酸的制备及性能评价[J].钻井液与完井液,2016,33(6):111-115.WANG Yanli.Preparation and performance evaluation of a new high performance steering acid[J].Drilling Fluid&Completion Fluid,2016,33(6):111-115.
[6]何春明,陈红军,刘岚,等.VES自转向酸变黏机理研究[J].钻井液与完井液,2010,27(4):84-86.HE Chunming,CHEN Hongjun,LIU Lan,et al.The mechanism of VES rotation to acid viscosity[J].Drilling Fluid&Completion Fluid,2010,27(4):84-86.
[7]高燕,张冕,邵秀丽.可回收速溶稠化酸体系的研发与应用[J].钻采工艺,2017,40(4):94-97.GAO Yan,ZHANG Mian,SHAO Xiuli.Development and application of recoverable instant thickening acid system[J].Drilling&Production Technology,2017,40(4):94-97.
[8]陈馥,侯帆,竭继忠,等.变黏酸稠化剂甜菜碱的合成及性能评价[J].钻井液与完井液,2011,28(6):64-66.CHEN Fu,HOU Fan,JIE Jizhong,et al.Synthesis and performance evaluation of betaine for viscous acid thickening agent[J].Drilling Fluid&Completion Fluid,2011,28(6):64-66.
[9]BIGGS S,SELB J,CANDA F.Effect of surfactant on the solution prope-rties of hydrophobically modified polyacrylamide[J].Langmuir,1992,8(3):838-847.
[10]卢杨,王奕,张熙,等.两性离子聚合物交联稠化酸的制备及其性能研究[J].钻采工艺,2009,32(2):74-76.LU Yang,WANG Yi,ZHANG Xi,et al.Preparation and properties of zwitterionic polymer crosslinked acid[J].Drilling&Production Technology,2009,32(2):74-76.
[11]赵向阳,李早元,朱娟娟.疏水缔合聚合物作为酸液稠化剂可行性研究[J].内蒙古石油化工,2007(12):168-170.ZHAO Xiangyang,LI Zaoyuan,ZHU Juanjuan.Feasibility study of hydrophobically associating polymer as thickening agent for acid solution[J].Inner Mongolia Petrochemical Industry,2007(12):168-170.
[12]戴姗姗,蔡馨.一种疏水缔合型阳离子聚合物酸液稠化剂的合成及性能[J].精细化工,2013,30(5):575-579.DAI Shanshan,CAI Xin.Synthesis and properties of hydrophobically associating cationic polymer acid thickener[J].Industry of Fine Chemicals,2013,30(5):575-579.
[13]任鲲,姜桂元,林梅钦,等.Na Cl对疏水缔合聚合物溶液性质的影响研究[J].功能高分子学报,2005,18(2):321-324.REN Kun,JIANG Guiyuan,LIN Meiqin,et al.Effect of NaCl on the properties of hydrophobically associating polymer solution[J].Journal of Functional Polymers,2005,18(2):321-324.
[14]鲍晋,罗平亚,郭拥军,等.非交联缔合结构压裂液新型增黏辅剂优选与性能评价[J].油田化学,2015,32(2):175-179.BAO Jin,LUO Pingya,GUO Yongjun,et al.Optimization and performance evaluation of new viscoelastic auxiliaries for non crosslinked associative fracturing fluids[J].Oilfield Chemistry,2015,32(2):175-179.
[15]戴秀兰.一种新型的抗高温稠化酸研究[D].西南石油大学,2014.DAI Xiulan.A new high temperature resistant thickening acid[D].Southwest Petroleum University,2014.