一种W/O乳化液在海上高温砂岩储层分流酸化中的评价与应用
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摘要
针对目前酸化常用分流剂无法简便有效地应用于海上高温砂岩储层油田酸化作业的现状,研制了一种由活性柴油与地层采出水配制的W/O乳化液分流体系。实验优选出的活性柴油与地层采出水比例为3∶7的乳化液在130℃和170 s~(-1)剪切速率下仍然具有40 mPa·s的黏度,单管岩心封堵实验表明,其对模拟水层与油层岩心的封堵率分别为大于80%和小于21.6%,并联双管岩心封堵分流实验表明其对低渗油层的分流率均能达到80%以上,分流酸化物理模拟实验表明,乳状液分流酸化后低渗油层岩心的渗透率增大170%左右,高渗水层岩心的渗透降低60%左右。该技术在南海西部油田矿场应用中取得了日增油103.3 m~3/d、含水率降低18.8%的显著增油降水效果,具有较大推广价值。
Diversion agents commonly used in present acidizing operations are unable to be easily and effectively used in acidizing high temperature offshore sandstone reservoirs. An invert emulsion diverting system has been developed with an active diesel oil and formation water to overcome this deficiency. The volumetric ratio of the active diesel oil and formation water is 3∶7 in the emulsion which has viscosity of 40 mPa·s even shearing at 170 s~(-1) under 130 ℃. Single barrel core test results showed that the permeability of simulated cores of water zones was reduced by more than 80%, and the permeability of simulated cores of oil zones reduced by less than 21.6%. Parallel dual-barrel core test results showed that the rate of diversion of the emulsion to low permeability pay zones was greater than 80%. Diverted acidizing physical simulation experimental results showed that after diverted acidizing with the emulsion, the permeability of low permeability pay zones was increased by about 170%, and the permeability of high permeability water zones reduced by about 60%. This technology has been applied in Nanhai West Oilfield, the oil production rate was increased by 103.3 m~3/d, and the water cut was reduced by 18.8%, indicating that the technology is worth spreading.
Diversion agents commonly used in present acidizing operations are unable to be easily and effectively used in acidizing high temperature offshore sandstone reservoirs. An invert emulsion diverting system has been developed with an active diesel oil and formation water to overcome this deficiency. The volumetric ratio of the active diesel oil and formation water is 3∶7 in the emulsion which has viscosity of 40 mPa·s even shearing at 170 s~(-1) under 130 ℃. Single barrel core test results showed that the permeability of simulated cores of water zones was reduced by more than 80%, and the permeability of simulated cores of oil zones reduced by less than 21.6%. Parallel dual-barrel core test results showed that the rate of diversion of the emulsion to low permeability pay zones was greater than 80%. Diverted acidizing physical simulation experimental results showed that after diverted acidizing with the emulsion, the permeability of low permeability pay zones was increased by about 170%, and the permeability of high permeability water zones reduced by about 60%. This technology has been applied in Nanhai West Oilfield, the oil production rate was increased by 103.3 m~3/d, and the water cut was reduced by 18.8%, indicating that the technology is worth spreading.
引文
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[15]张谦,陈大钧,熊颖,等.抗高温乳化酸酸化技术的研究与应用[J].钻井液与完井液,2008,25(2):51-53.ZHANG Qian,CHEN Dajun,XIONG Ying,et al.The studies and application of acidification technology of high temperature emulsified acids[J].Drilling Fluid&Completion Fluid,2008,25(2):51-53.
[2]刘平礼,张璐,潘亿勇,等,海上油田注水井单步法在线酸化技术[J].西南石油大学学报(自然科学版),2014,36(5):148-154.LIU Pingli,ZHANG Lu,PAN Yiyong,et al.Single step online acidizing technology for offshore water injection wells[J].Journal of Southwest Petroleum University(Science&Technology Edition),2014,36(5):148-154.
[3]高尚,符扬洋,孟祥海,等.新型砂岩自转向酸体系的研究与应用[J].钻井液与完井液,2017,34(2):121-125.GAO Shang,FU Yangyang,MENG Xianghai,et al.Study and application of a new self-diverting acid for use in sandstone fracturing[J].Drilling Fluid&Completion Fluid,2017,34(2):121-125.
[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.The present situation and the future of steering acidization technique[J].Petroleum Geology&Oilfield Development in Daqing,2006,25(2):68-71.
[5]赵修太,陈泽华,陈文雪,等.颗粒类调剖堵水剂的研究现状与发展趋势[J].石油钻采工艺,2015,37(4):105-112.ZHAO Xiutai,CHEN Zehua,CHEN Wenxue,et al.The current research situation and development trend of particle profile-control plugging agents[J].Oil Drilling&Production Technology,2015,37(4):105-112.
[6]李松岩.氮气泡沫分流酸化工艺技术研究[D].中国石油大学,2009.LI Yansong.Research on diverted acidizing with nitrogen foam fluid[D].China University of Petroleum(East China),2009.
[7]何春明,陈红军,赵洪涛,等.VES自转向酸体系流变性能[J].油气地质与采收率,2010,17(4):104-107.HE Chunming,CHEN Hongjun,ZHAO Hongtao,et al.Study on rheological of VES self-diversion acid system[J].Petroleum Geology and Recovery Efficiency,2010,17(4):104-107.
[8]王桂勋,柴德民,张庆华,等.乳化原油选择性堵水室内研究[J].钻采工艺,2005,28(1):86-88.WANG Guixun,CHAI Demin,ZHANG Qinghua,et al.The laboratory research on selective water-plugging technology in crude oil emulsification[J].Driling&Production Technology,2005,28(1):86-88.
[9]赵修太,白英睿,王增宝,等.乳状液体系在油田中的应用综述[J].中外能源,2011,16(11):15-50.ZHAO Xiutai,BAI Yingrui,Wang Gcngbao,et al.Summary about application of emulsion system in oilficld[J].Sino-Global Encrgy,2011,16(11):15-50.
[10]FU Xuebing,ROBERT H L.Water-irroil emulsions:Flow in porous media and FOR potential[J].SPE 162633,2012.
[11]申龙涉,王戬丽,李恩田,等.含水超稠油流变性试验与研究[J].油气储运,2007,26(9):24-26.SHEN Longshe,WANG Jianli,LI Entian,et al.Experiment study on the rheology of wet extra-viscous crude[J].Oil&Gas Storage and Transportation,2007,26(9):24-26.
[12]董巧玲,蒲春生,郑黎明等.稠油W/O型乳状液表观黏度变化微观原因解析[J].陕西科技大学学报,2014,32(5):95-99.DONG Qiaoling,PU Chunsheng,ZHENG Liming,et al.Microscopic reason of apparent viscosity changes of water in oil emulsion oil[J].Journal of Shanxi University of Science&Technology,2014,32(5):95-99.
[13]孟江,向阳,魏小林,等.高内相稠油油包水乳状液流变性研究[J].西南石油大学学报,2007,29(2):122-124.MENG Jiang,XIANG Yang,WEI Xiaoling,et al.High internal phase heavy oil water-oil emulsion rheology[J].Journal of Southwest Petroleum University,2007,29(2):122-124.
[14]林吉生,唐培忠,郝清滟,等.稠油HLB值与含水率反相点的关联研究[J].石油炼制与化工,2015,46(8):61-65.LIN Jisheng,TANG Peizhong,HAO Qingyan,et al.Correlation of heavy oil HLB value and its moisture inverted point[J].Petroleum Processing and Petrochemicals,2015,46(8):61-65.
[15]张谦,陈大钧,熊颖,等.抗高温乳化酸酸化技术的研究与应用[J].钻井液与完井液,2008,25(2):51-53.ZHANG Qian,CHEN Dajun,XIONG Ying,et al.The studies and application of acidification technology of high temperature emulsified acids[J].Drilling Fluid&Completion Fluid,2008,25(2):51-53.