射孔参数对注聚溶液黏度影响研究
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摘要
注聚井射孔孔眼附近的高速剪切会使聚合物溶液发生机械降解导致黏度损失严重,影响驱油效率。分析了聚合物溶液在射孔孔眼处的黏损机理,研究不同射孔参数对孔眼内黏度与孔眼前后黏损的影响。研究表明,孔眼内聚合物溶液的表观黏度及其对流量的敏感性随流量增大而减小;其对孔径的敏感性较射孔密度更强;在高射孔密度、大孔径下溶液黏度更高。为保持黏度的有效性,特定射孔参数下存在极限流量。孔眼处聚合物溶液黏损对不同参数的敏感性差异大,较高流变指数、射孔密度、孔径及小尺寸套管可减小黏损。运用本文的研究结果,可以合理选定射孔完井参数,进而提高聚驱效率。
The high-speed shear rate near the perforation hole of the injection well causes the polymer solution mechanical degradation and the viscosity loss is serious,which affects the oil displacement efficiency.The mechanism of the viscosity of the polymer solution at the perforation hole is analyzed.Effects of different parameters on the polymer solution viscosity and the viscosity loss in perforation hole are studied.Studies have shown that the polymer solution apparent viscosity and its sensitivity to flow rate decreases with increasing flow rate;its sensitivity to perforation hole size is stronger than that of perforation density;the solution viscosity is higher at high perforation density and large perforation hole diameter.To maintain viscosity effectiveness,there is a limit flow rate under specific perforation parameters.The polymer solution viscosity loss is sensitive to different parameters,and the higher rheological index,perforation density,perforation hole diameter and small size casing can reduce the viscosity loss.Through the research results of this paper,the perforation completion parameters can be reasonably selected to improve the polymer flooding efficiency.
The high-speed shear rate near the perforation hole of the injection well causes the polymer solution mechanical degradation and the viscosity loss is serious,which affects the oil displacement efficiency.The mechanism of the viscosity of the polymer solution at the perforation hole is analyzed.Effects of different parameters on the polymer solution viscosity and the viscosity loss in perforation hole are studied.Studies have shown that the polymer solution apparent viscosity and its sensitivity to flow rate decreases with increasing flow rate;its sensitivity to perforation hole size is stronger than that of perforation density;the solution viscosity is higher at high perforation density and large perforation hole diameter.To maintain viscosity effectiveness,there is a limit flow rate under specific perforation parameters.The polymer solution viscosity loss is sensitive to different parameters,and the higher rheological index,perforation density,perforation hole diameter and small size casing can reduce the viscosity loss.Through the research results of this paper,the perforation completion parameters can be reasonably selected to improve the polymer flooding efficiency.
引文
[1]杨海陵.聚合物溶液经近井地带性能变化及其对驱油效能的影响[D].成都:西南石油大学,2012.
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[4] SMITH J E.Closing the lab-field gap:a look at near-wellbore flow regimes and performance of 57field projects[C]∥Improved Oil Recovery Symposium.1994.
[5] SZABO M T.Molecular and microscopic interpretation of the flow of hydrolyzed polyacrylamide solution through porous media[C]∥Fall Meeting of the Society of Petroleum Engineers of AIME.1972.
[6]叶仲斌,李晓南,施雷庭,等.疏水缔合聚合物溶液的渗流特性[J].油气地质与采收率,2008,15(3):61-65.YE Zhongbin,LI Xiaonan,SHI Leiting,et al.Seepage characteristics of hydrophobically associating polymer solutions[J].Petroleum Geology and Recovery Efficiency,2008,15(3):61-
[7]舒政,叶仲斌,张健,等.聚合物溶液近井地带速率剪切模拟实验装置设计[J].油气地质与采收率,2010,17(4):55-58.SHU Zheng,YE Zhongbin,ZHANG Jian,et al.Experimental design of polymer solution near-wellbore rate shear simulation device[J].Petroleum Geology and Recovery Efficiency,2010,17(4):55-58.
[8]韩显卿.提高采收率原理[M].北京:石油工业出版社,1993.
[9]陈家琅.水力学[M].北京:石油工业出版社,1980.
[10] WASSMUTH F R,GREEN K,ARNOLD W,et al.Polymer flood application to improve heavy oil recovery at east Bodo[J].Journal of Canadian Petroleum Technology,2009,48(2):55-61.
[11]李贺.聚合物溶液在管柱中的黏度变化研究[J].中国石油和化工标准与质量,2015(8):56.LI He.Study on viscosity change in polymer solution injection pipe[J].China Petroleum and Chemical Standard and Quality,2015(8):56.
[2] SUHY T E,HARRIS R P.Application of polymer specific enzymes to clean up drill-in fluids[C]∥SPE Eastern Regional Meeting.Society of Petroleum Engineers.1998.
[3]汪伟英,张磊.完井方式对聚合物黏度的影响[J].石油天然气学报,2007,29(4):108-110.WANG Weiying,ZHANG Lei.The effect on the polymer solution viscosity from well completion[J].Journal of Oil and Gas Technology,2007,29(4):108-110.
[4] SMITH J E.Closing the lab-field gap:a look at near-wellbore flow regimes and performance of 57field projects[C]∥Improved Oil Recovery Symposium.1994.
[5] SZABO M T.Molecular and microscopic interpretation of the flow of hydrolyzed polyacrylamide solution through porous media[C]∥Fall Meeting of the Society of Petroleum Engineers of AIME.1972.
[6]叶仲斌,李晓南,施雷庭,等.疏水缔合聚合物溶液的渗流特性[J].油气地质与采收率,2008,15(3):61-65.YE Zhongbin,LI Xiaonan,SHI Leiting,et al.Seepage characteristics of hydrophobically associating polymer solutions[J].Petroleum Geology and Recovery Efficiency,2008,15(3):61-
[7]舒政,叶仲斌,张健,等.聚合物溶液近井地带速率剪切模拟实验装置设计[J].油气地质与采收率,2010,17(4):55-58.SHU Zheng,YE Zhongbin,ZHANG Jian,et al.Experimental design of polymer solution near-wellbore rate shear simulation device[J].Petroleum Geology and Recovery Efficiency,2010,17(4):55-58.
[8]韩显卿.提高采收率原理[M].北京:石油工业出版社,1993.
[9]陈家琅.水力学[M].北京:石油工业出版社,1980.
[10] WASSMUTH F R,GREEN K,ARNOLD W,et al.Polymer flood application to improve heavy oil recovery at east Bodo[J].Journal of Canadian Petroleum Technology,2009,48(2):55-61.
[11]李贺.聚合物溶液在管柱中的黏度变化研究[J].中国石油和化工标准与质量,2015(8):56.LI He.Study on viscosity change in polymer solution injection pipe[J].China Petroleum and Chemical Standard and Quality,2015(8):56.