特低渗油藏氮气泡沫驱油效率实验研究其现场应用
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摘要
为进一步提高特低渗JD油田原油采收率,在模拟油藏条件下,开展氮气泡沫驱油效率实验,研究注入方式、注入量、注入速度以及气液比对氮气泡沫驱油效率的影响。结果表明:水驱后转气水交替驱易形成窜流,封堵效果不佳;氮气泡沫驱驱油效率比纯氮气驱驱油效率高;氮气与起泡剂溶液段塞式注入比气液混合注入更适合该区块;采出程度增幅随着注入速度的增加呈现先增大后减小的趋势;当气液体积比为1∶1时,整体采出程度增幅最大。最佳的注入段塞量为0. 1 PV0. 33%起泡剂溶液+0. 1 PV氮气+0. 03 PV地层水+0. 1 PV0. 33%起泡剂溶液+0. 1 PV氮气+0. 03 PV地层水,段塞的最佳注入速度为0. 03 m L/min。现场试验表明氮气泡沫驱能有效提高原油采收率。
In order to further enhance the oil recovery of ultra-low permeability JD oilfield,nitrogen foam flooding efficiency experiment was carried out under simulated reservoir conditions,and the effects of injection mode,injection volume,injection rate and gas-to-liquid ratio on nitrogen foam flooding efficiency were studied. The results show that: after water flooding,gas-water alternating flooding is easy to form channeling,and the plugging effect is not good; Nitrogen foam flooding efficiency is higher than pure nitrogen flooding efficiency;the alternating injection of nitrogen and foaming agent solution is more suitable for this area than the mixing injection of them; The increment of recovery degree increases first and then decreases with the increase of injection rate; When the gas-liquid ratio is 1∶ 1,the increment of overall recovery degree increases the most. The optimum injection slug amount is 0. 10 PV 0. 33% foaming agent solution +0. 10 PV nitrogen + 0. 03 PV formation water + 0. 10 PV 0. 33% foaming agent solution + 0. 10 PV nitrogen + 0. 03 PV formation water,and the optimum injection rate of the slugs is 0. 03 m L/min. Field tests show that nitrogen foam flooding can effectively improve oil recovery.
In order to further enhance the oil recovery of ultra-low permeability JD oilfield,nitrogen foam flooding efficiency experiment was carried out under simulated reservoir conditions,and the effects of injection mode,injection volume,injection rate and gas-to-liquid ratio on nitrogen foam flooding efficiency were studied. The results show that: after water flooding,gas-water alternating flooding is easy to form channeling,and the plugging effect is not good; Nitrogen foam flooding efficiency is higher than pure nitrogen flooding efficiency;the alternating injection of nitrogen and foaming agent solution is more suitable for this area than the mixing injection of them; The increment of recovery degree increases first and then decreases with the increase of injection rate; When the gas-liquid ratio is 1∶ 1,the increment of overall recovery degree increases the most. The optimum injection slug amount is 0. 10 PV 0. 33% foaming agent solution +0. 10 PV nitrogen + 0. 03 PV formation water + 0. 10 PV 0. 33% foaming agent solution + 0. 10 PV nitrogen + 0. 03 PV formation water,and the optimum injection rate of the slugs is 0. 03 m L/min. Field tests show that nitrogen foam flooding can effectively improve oil recovery.
引文
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[10]周志斌,王杰祥,王腾飞,等.裂缝性低渗透油藏氮气泡沫调驱技术研究[J].石油化工高等学校学报,2016,29(1):31-34.ZHOU Zhibin,WANG Jiexiang,WANG Tengfei,et al. Nitrogen foam profile control and displacement technology applied in naturally fractured low-permeability reservoir[J]. Journal of Petrochemical Universities,2016,29(1):31-34.
[11]BERGERON V,HANSSEN J E,SHOGHL F N. Thin-film forces in hydrocarbon foam films and their application to gas-blocking foams in enhanced oil recovery[J]. Colloids&Surfaces A Physicochemical&Engineering Aspects,1997,123-124:609-622.
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[2]李兆敏,孙茂盛,林日亿,等.泡沫封堵及选择性分流实验研究[J].石油学报,2007,28(4):115-118.LI Zhaomin,SUN Maosheng,LIN Riyi,et al. Laboratory study on foam plugging and selective divided-flow[J].Acta Petrolei Sinica,2007,28(4):115-118.
[3]王杰祥,王腾飞,韩蕾,等.特低渗油藏空气泡沫驱提高采收率实验研究[J].西南石油大学学报(自然科学版),2013,35(5):130-134.WANG Jiexiang WANG Tengfei HAN Lei,et al. Experimental study of improved oil recovery through air foam flooding in ultra-low permeability reservoir[J]. Journal of Southwest Petroleum University(Science&Technology Edition),2013,35(5):130-134.
[4]李宾飞,李兆敏,吕其超,等.泡沫在裂缝中流动特征的物理模拟[J].中南大学学报(自然科学版),2017,48(9):2465-2473.LI Binfei,LI Zhaomin,LYU Qichao,et al. Physical simulation on flowing characteristics of foam in fracture[J].Journal of Central South University(Science and Technology),2017,48(9):2465-2473.
[5]王杰祥,李娜,孙红国,等.非均质油层空气泡沫驱提高采收率试验研究[J].石油钻探技术,2008,36(2):4-6.WANG Jiexiang,LI Na,SUN Hongguo,et al. Experiment study of improved oil recovery through air foam flooding in heterogeneous reservoir[J]. Petroleum Drilling Techniques,2008,36(2):4-6.
[6]赵惊蛰,李书恒,屈雪峰,等.特低渗透油藏开发压裂技术[J].石油勘探与开发,2002,29(5):93-95.ZHAO Jingzhe,LI Shuheng,QU Xuefeng,et al. Fracturing technique of super-low permeability reservoir development[J]. Petroleum Exploration and Development,2002,29(5):93-95.
[7] SANCHEZ J M,HAZLETT R D. Foam flow through an oil-wet porous medium:a laboratory study[J]. SPE Reservoir Engineering,1992,7(1):91-97.
[8]付美龙.油田化学原理[M].北京:石油工业出版社,2015.
[9]李兆敏,张习斌,李松岩,等.氮气泡沫驱气体窜流特征实验研究[J].中国石油大学学报(自然科学版),2016,40(5):96-103.LI Zhaomin,ZHANG Xibin,LI Songyan,et al. Experimental study on gas channeling problem of N2foam flooding[J]. Journal of the University of Petroleum,China(Edition of Natural Science),2016,40(5):96-103.
[10]周志斌,王杰祥,王腾飞,等.裂缝性低渗透油藏氮气泡沫调驱技术研究[J].石油化工高等学校学报,2016,29(1):31-34.ZHOU Zhibin,WANG Jiexiang,WANG Tengfei,et al. Nitrogen foam profile control and displacement technology applied in naturally fractured low-permeability reservoir[J]. Journal of Petrochemical Universities,2016,29(1):31-34.
[11]BERGERON V,HANSSEN J E,SHOGHL F N. Thin-film forces in hydrocarbon foam films and their application to gas-blocking foams in enhanced oil recovery[J]. Colloids&Surfaces A Physicochemical&Engineering Aspects,1997,123-124:609-622.
[12]SAYEGH S G,NAJMAN J,WONG S T. Multiple contact phase behaviour in the displacement of crude oil with nitrogen and enriched nitrogen[J]. Journal of Canadian Petroleum Technology,1987,26(6):12-15.
[13]李雪松,王军志,王曦.多孔介质中泡沫驱油微观机理研究[J].石油钻探技术,2009,37(5):109-113.LI Xuesong,WANG Junzhi,WANG Xi. Studies of microcosmic foam driving mechanism in porous medium[J]. Petroleum Drilling Techniques,2009,37(5):109-113.