文章摘要
低渗透油藏毛细作用评价方法研究
Study on Evaluation Method of Capillary Action for Low Permeability Reservoirs
  
DOI:10.19346./j.cnki.1000-4092.2017.04.029
中文关键词: 毛细管/管束  纳米化学剂  自渗吸  毛细阻力  低渗透
英文关键词: capillary tube/bundle  nano chemicals  adsorption  capillary resistance  low permeability
基金项目:中国石油天然气股份有限公司科学研究与技术开发项目“纳米智能驱油剂研制”(项目编号2014A-1001)。
作者单位
耿向飞1,2,罗健辉1,2,丁彬1,2,王平美1,2,彭宝亮1,2,贺丽鹏1,2 1. 中国石油勘探开发研究院北京1000832. 中国石油天然气股份有限公司纳米化学重点实验室北京100083 
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中文摘要:
      毛细作用贯穿低渗透油藏开发全过程,毛细作用改变能力直接影响提高采收率幅度。本文以低渗透油藏孔喉尺寸为依据,研发了一套以毛细管/管束、微计量、可视化评价为核心的毛细作用分析系统,将不同流体在多孔介质中内的运移状态等效为在不同尺寸毛细管/管束中的渗流,准确评价驱替液的启动压力梯度和毛细阻力,反映不同类型驱油剂的注入效果与微观扩大波及体积能力。实验选取了水、甜菜碱表面活性剂与纳米SiO2驱油剂等5 种典型驱油剂,通过注入不同直径(0.3~10 μm)的毛细管,评价了不同驱油剂的启动压力梯度和毛细阻力。室内评价结果显示:在实验选用的亲水、疏水毛管条件下,纳米SiO2驱油剂降低毛细阻力能力均优于水与常规甜菜碱表面活性剂;亲水改性纳米SiO2对毛细阻力降低幅度最大,且毛细管越细(≤1 μm),注入性改善优势越明显,说明该类纳米材料可以降低驱替介质可注入的“门槛”渗透率,从而扩大常规水驱波及不到的波及体积,有望进一步提高低/特低渗透储层注入效果。图5 表2 参10
英文摘要:
      Capillary action exists in the whole process of low permeability development,and the ability of altering capillary action can directly influence the EOR. Based on the pore size of low permeability reservoirs,this paper developed a capillary action analysis system cored with capillary tube/bundle,micro metering and visual evaluation,simulating the migration of flood fluids in the porous media as in the capillary tube/bundle,and evaluating the capillary resistance of flood fluids,reflecting the injection ability and enlarging sweep volume ability of different flood fluids. Five oil displacing agents including water,betai surfactant and nano SiO2 oil-displacing agents,were selected as the objectives and their absorption ability and capillary resistance in capillaries with different diameter of 0.3—10 μm was evaluated. The results showed that,No matter hydrophilic capillary or hydrophobic capillary,the ability of nano SiO2 oil-displacing agents for decreasing the capillary resistance was higher than that of water and common betai surfactant,weakly hydrophilic modified nano SiO2 was the best in lowering the capillary resistance. Moreover,the smaller the diameter of capillary tube was,the injection ability of the hydrophilic modified nano SiO2 was better,indicating that these nano-materials could decrease the "threshold" permeability of flooding fluids,thus increase the sweeping volume which can not be swept by conventional water flooding,and improve the injection ability of low permeability reservoirs.
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