低渗透油层低黏度聚驱微观剩余油动用机理
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摘要
为了描述低黏度聚合物对于低渗透油层剩余油挖潜效果,采用微观驱油实验和天然岩心解剖实验,研究在低黏度聚合物溶液作用下低渗透油藏驱油效果,以及改变黏度后各类剩余油动用状况。结果显示:对于相同孔喉比孔隙结构而言,聚合物黏度越大,剩余油分布比例越小,随着黏度的增大,低黏度聚合物体系最小压力梯度增大,从而克服压敏、贾敏等阻力效应,改善各类剩余油的动用状况;在可注入条件下,与水驱相比,随着聚合物黏度的增大,采收率提高值最高可达到5.78百分点,从而验证了低黏度聚合物驱在低渗透油层的可行性,为低渗透油藏改善驱油效果提供理论支持。
In order to describe the tapping potential of low viscosity polymer for remaining oil in low permeability reservoirs, microdisplacement experiment and natural core anatomy experiment were used to study the effect of low viscosity polymer solution on oil displacement in low permeability reservoirs, and the production status of various remaining oil after changing viscosity. The results show that for the same pore throat ratio of pore structure, the higher the viscosity of polymer, the smaller the proportion of residual oil distribution. The minimum pressure gradient of low viscosity polymer system increases with the increase of viscosity, so as to overcome the pressure sensitivity and Jamin effect resistance effect and improve the utilization of various types of residual oil. With the increase of polymer viscosity, the maximum enhanced oil recovery can reach 5.78% compared with water flooding, which verifies the feasibility of low viscosity polymer flooding in low permeability reservoirs and provides theoretical support for improving oil displacement effect in low permeability reservoirs.
In order to describe the tapping potential of low viscosity polymer for remaining oil in low permeability reservoirs, microdisplacement experiment and natural core anatomy experiment were used to study the effect of low viscosity polymer solution on oil displacement in low permeability reservoirs, and the production status of various remaining oil after changing viscosity. The results show that for the same pore throat ratio of pore structure, the higher the viscosity of polymer, the smaller the proportion of residual oil distribution. The minimum pressure gradient of low viscosity polymer system increases with the increase of viscosity, so as to overcome the pressure sensitivity and Jamin effect resistance effect and improve the utilization of various types of residual oil. With the increase of polymer viscosity, the maximum enhanced oil recovery can reach 5.78% compared with water flooding, which verifies the feasibility of low viscosity polymer flooding in low permeability reservoirs and provides theoretical support for improving oil displacement effect in low permeability reservoirs.
引文
[1]赵方剑.特高温低渗透油藏乳液表面活性剂驱现场试验[J].特种油气藏,2017,24(6):125-128.
[2]付美龙,黄俊.低渗透油藏水驱转空气泡沫驱提高采收率物理模拟实验[J].油气地质与采收率,2014,21(5):104-106,118.
[3]尤源,岳湘安,王锐,等.低渗透非均质油藏提高采收率实验研究[J].大庆石油地质与开发,2008,27(1):118-121,125.
[4] XIAO P F, YANG ZM, WANG XW, et al. Experimental investigation on CO2injection in the Daqing extra/ultra-low permeability reservoir[J]. Journal of Petroleum Science and Engineering,2017,149(1):765-771.
[5]杜朝锋,武平仓,邵创国,等.长庆油田特低渗透油藏二氧化碳驱提高采收率室内评价[J].油气地质与采收率,2010,17(4):63-64,76.
[6]石立华,党海龙,康胜松,等.注入压力对CO2驱气窜影响规律及裂缝封堵研究[J].西南石油大学学报(自然科学版),2018,40(1):149-156.
[7]李向良.二氧化碳驱油藏产出气回注的可行性及其对驱油效果的影响[J].油气地质与采收率,2016,23(3):72-76.
[8]伦增珉,王锐,吕成远,等.低渗透油藏二氧化碳驱修正毛管数理论及参数优化[J].油气地质与采收率,2016,23(2):83-86,92.
[9]代宸宇,王重善,陈青松,等.川中致密砂岩油藏表面活性剂驱油机理数值模拟[J].石油与天然气化工,2017,46(2):85-88.
[10]卢祥国,高振环,刘德庭,等.聚合物驱后表面活性剂稀溶液驱油机理的微观模型研究[J].油田化学,1997,14(1):66-68.
[11]殷代印,项俊辉,房雨佳.低渗透油藏微乳液驱微观剩余油驱替机理研究[J].特种油气藏,2017,24(5):136-140.
[12]殷代印,徐文博,周亚洲.低渗透油藏微乳液配方的优选及性能研究[J].石油化工高等学校学报,2017,30(3):20-25.
[13]黄延章,周娟,田根林,等.胶束-微乳液驱油机理的实验研究[J].油田化学,1986,3(4):234-243.
[14]白振强,吴胜和,付志国.大庆油田聚合物驱后微观剩余油分布规律[J].石油学报,2013,34(5):924-931.
[15]宋考平,李世军,方伟,等.用荧光分析方法研究聚合物驱后微观剩余油变化[J].石油学报,2005,26(2):92-95.
[16]于洪敏,聂俊,王友启,等.低渗透油藏聚合物驱启动压力梯度的表征[J].油田化学,2016,33(2):281-284,290.
[17]李丹丹,王业飞,张鹏,等.低渗透油藏驱油用聚合物相对分子质量确定方法的研究进展[J].油田化学,2014,31(3):470-474.
[18]殷代印,李宇恒,周亚洲.一种聚合物驱数值模拟物化参数的确定方法[J].油田化学,2016,33(4):664-669.
[19]王德民,王刚,吴文祥,等.黏弹性驱替液所产生的微观力对驱油效率的影响[J].西安石油大学学报(自然科学版),2008,25(1):43-55,112.
[2]付美龙,黄俊.低渗透油藏水驱转空气泡沫驱提高采收率物理模拟实验[J].油气地质与采收率,2014,21(5):104-106,118.
[3]尤源,岳湘安,王锐,等.低渗透非均质油藏提高采收率实验研究[J].大庆石油地质与开发,2008,27(1):118-121,125.
[4] XIAO P F, YANG ZM, WANG XW, et al. Experimental investigation on CO2injection in the Daqing extra/ultra-low permeability reservoir[J]. Journal of Petroleum Science and Engineering,2017,149(1):765-771.
[5]杜朝锋,武平仓,邵创国,等.长庆油田特低渗透油藏二氧化碳驱提高采收率室内评价[J].油气地质与采收率,2010,17(4):63-64,76.
[6]石立华,党海龙,康胜松,等.注入压力对CO2驱气窜影响规律及裂缝封堵研究[J].西南石油大学学报(自然科学版),2018,40(1):149-156.
[7]李向良.二氧化碳驱油藏产出气回注的可行性及其对驱油效果的影响[J].油气地质与采收率,2016,23(3):72-76.
[8]伦增珉,王锐,吕成远,等.低渗透油藏二氧化碳驱修正毛管数理论及参数优化[J].油气地质与采收率,2016,23(2):83-86,92.
[9]代宸宇,王重善,陈青松,等.川中致密砂岩油藏表面活性剂驱油机理数值模拟[J].石油与天然气化工,2017,46(2):85-88.
[10]卢祥国,高振环,刘德庭,等.聚合物驱后表面活性剂稀溶液驱油机理的微观模型研究[J].油田化学,1997,14(1):66-68.
[11]殷代印,项俊辉,房雨佳.低渗透油藏微乳液驱微观剩余油驱替机理研究[J].特种油气藏,2017,24(5):136-140.
[12]殷代印,徐文博,周亚洲.低渗透油藏微乳液配方的优选及性能研究[J].石油化工高等学校学报,2017,30(3):20-25.
[13]黄延章,周娟,田根林,等.胶束-微乳液驱油机理的实验研究[J].油田化学,1986,3(4):234-243.
[14]白振强,吴胜和,付志国.大庆油田聚合物驱后微观剩余油分布规律[J].石油学报,2013,34(5):924-931.
[15]宋考平,李世军,方伟,等.用荧光分析方法研究聚合物驱后微观剩余油变化[J].石油学报,2005,26(2):92-95.
[16]于洪敏,聂俊,王友启,等.低渗透油藏聚合物驱启动压力梯度的表征[J].油田化学,2016,33(2):281-284,290.
[17]李丹丹,王业飞,张鹏,等.低渗透油藏驱油用聚合物相对分子质量确定方法的研究进展[J].油田化学,2014,31(3):470-474.
[18]殷代印,李宇恒,周亚洲.一种聚合物驱数值模拟物化参数的确定方法[J].油田化学,2016,33(4):664-669.
[19]王德民,王刚,吴文祥,等.黏弹性驱替液所产生的微观力对驱油效率的影响[J].西安石油大学学报(自然科学版),2008,25(1):43-55,112.