热敏暂堵剂笼统控水技术
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摘要
针对常规笼统控水技术会对油层造成二次伤害的缺点,采用水溶液聚合的方法合成了控水用热敏暂堵剂,提出二次暂堵工艺,并进行了矿场应用。通过室内实验对热敏暂堵剂进行了配方优选和性能评价,优化后的配方为:(6%~8%)丙烯酰胺+(0.08%~0.12%)过硫酸铵+(1.5%~2.0%)海泡石+(0.5%~0.8%)聚乙二醇二丙烯酸酯。该材料适用地层温度为70~90℃,暂堵强度高(5~40 kPa),降解时间可控(1~15 d),降解后流体黏度小于100 m Pa·s且模拟岩心渗透率恢复值大于95%。基于研究成果,采用二次暂堵工艺对冀东油田1口水平井开展了热敏暂堵笼统控水技术的矿场应用,该井经处理后含水率降低至27%,目前含水率67%,日增油4.8 t,累计增油量达750 t,控水增油效果较好。
Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique,a thermo-sensitive temporary plugging agent for water control was synthesized by water solution polymerization and applied in the field with a new secondary temporary plugging technique.The optimization and performance evaluation of thermo-sensitive temporary plugging agent were carried out through laboratory experiments.The optimized formula is as follows:(6%-8%) acrylamide +(0.08%-0.12%) ammonium persulfate +(1.5%-2.0%) sepiolite +(0.5%-0.8%) polyethylene glycol diacrylate.The thermo-sensitive temporary plugging agent is suitable for formation temperatures of 70-90 ℃,it has high temporary plugging strength(5-40 k Pa),controllable degradation time(1-15 d),the apparent viscosity after degradation of less than 100 m Pa?S and the permeability recovery value of simulated cores of more than 95%.Based on the research results,secondary temporary plugging technique was used in a horizontal well in the Jidong Oilfield.After treatment,the well saw a drop of water cut to 27%,and now it has a water cut of 67%,its daily increased oil production was 4.8 t,and the cumulative oil increment was 750 t,demonstrating that the technique worked well in controlling water production and increasing oil production.
Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique,a thermo-sensitive temporary plugging agent for water control was synthesized by water solution polymerization and applied in the field with a new secondary temporary plugging technique.The optimization and performance evaluation of thermo-sensitive temporary plugging agent were carried out through laboratory experiments.The optimized formula is as follows:(6%-8%) acrylamide +(0.08%-0.12%) ammonium persulfate +(1.5%-2.0%) sepiolite +(0.5%-0.8%) polyethylene glycol diacrylate.The thermo-sensitive temporary plugging agent is suitable for formation temperatures of 70-90 ℃,it has high temporary plugging strength(5-40 k Pa),controllable degradation time(1-15 d),the apparent viscosity after degradation of less than 100 m Pa?S and the permeability recovery value of simulated cores of more than 95%.Based on the research results,secondary temporary plugging technique was used in a horizontal well in the Jidong Oilfield.After treatment,the well saw a drop of water cut to 27%,and now it has a water cut of 67%,its daily increased oil production was 4.8 t,and the cumulative oil increment was 750 t,demonstrating that the technique worked well in controlling water production and increasing oil production.
引文
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[3]成梅华.水溶性暂堵剂的研究与应用[J].石油化工应用,2015,34(4):91-93.CHENG Meihua.Investigation and application of water soluble temporary plugging agent[J].Petrochemical Industry Application,2015,34(4):91-93.
[4]王学忠,杨元亮,席伟军.油水过渡带薄浅层特稠油微生物开发技术:以准噶尔盆地西缘春风油田为例[J].石油勘探与开发,2016,43(4):630-635.WANG Xuezhong,YANG Yuanliang,XI Weijun.Microbial enhanced oil recovery of oil-water transitional zone in thin-shallow extra heavy oil reservoirs:A case study of Chunfeng Oilfield in western margin of Junggar Basin,NW China[J].Petroleum Exploration and Development,2016,43(4):630-635.
[5]WANG S,LI Y,FEI X,et al.Preparation of a durable superhydrophobic membrane by electrospinning poly(vinylidene fluoride)(PVDF)mixed with epoxy-siloxane modified Si O2nanoparticles:A possible route to superhydrophobic surfaces with low water sliding angle and high water contact angle[J].Journal of Colloid and Interface Science,2011,359(2):380-388.
[6]CHO K H,CHEN L J.Fabrication of sticky and slippery superhydrophobic surfaces via spin-coating silica nanoparticles onto flat/patterned substrates[J].Nanotechnology,2011,22(44):445706.
[7]KARUNAKARAN R G,LU C H,ZHANG Z,et al.Highly transparent superhydrophobic surfaces from the coassembly of nanoparticles(≤100 nm)[J].Langmuir,2011,27(8):4594-4602.
[8]王伟吉,邱正松,黄维安,等.纳米聚合物微球封堵剂的制备及特性[J].钻井液与完井液,2016,33(1):33-36.WANG Weiji,QIU Zhengsong,HUANG Weian,et al.Preparation and characteristics of nano polymer microspheres used as plugging agent in drilling fluid[J].Drilling Fluid and Completion Fluid,2016,33(1):33-36.
[9]兰玉波,杨清彦,李斌会.聚合物驱波及系数和驱油效率实验研究[J].石油学报,2006,27(1):64-68.LAN Yubo,YANG Qingyan,LI Binhui.Experimental research on sweep efficiency and oil displacement efficiency of polymer flooding[J].Acta Petrolei Sinica,2006,27(1):64-68.
[10]许长福,刘红现,钱根宝,等.克拉玛依砾岩储集层微观水驱油机理[J].石油勘探与开发,2011,38(6):725-732.XU Changfu,LIU Hongxian,QIAN Genbao,et al.Microcosmic mechanisms of water-oil displacement in conglomerate reservoirs in Karamay Oilfield,NW China[J].Petroleum Exploration and Development,2011,38(6):725-732.
[11]卢祥国,王树霞,王荣健,等.深部液流转向剂与油藏适应性研究:以大庆喇嘛甸油田为例[J].石油勘探与开发,2011,38(5):576-582.LU Xiangguo,WANG Shuxia,WANG Rongjian,et al.Adaptability of a deep profile control agent to reservoirs:Taking the Lamadian Oilfield in Daqing as an example[J].Petroleum Exploration and Development,2011,38(5):576-582.