Qu Zhanqing, Zhai Hengli, Tian Xianglei, Cui Quanyi, Wen Qingzhi. Experimental Research on Variable Threshold Pressure Gradient Considering Pressure Sensitive Effect[J]. Petroleum Drilling Techniques, 2012, 40(3): 78-82. DOI: 10.3969/j.issn.1001-0890.2012.03.016
Citation: Qu Zhanqing, Zhai Hengli, Tian Xianglei, Cui Quanyi, Wen Qingzhi. Experimental Research on Variable Threshold Pressure Gradient Considering Pressure Sensitive Effect[J]. Petroleum Drilling Techniques, 2012, 40(3): 78-82. DOI: 10.3969/j.issn.1001-0890.2012.03.016

Experimental Research on Variable Threshold Pressure Gradient Considering Pressure Sensitive Effect

More Information
  • Received Date: May 26, 2011
  • Revised Date: March 26, 2012
  • Due to strong threshold pressure gradient and pressure sensitive effect Darcy’s Law cannot be used to describe fluid flow in low permeability reservoirs.To investigate the effect of effective stress on porosity and permeability as well as measuring the threshold pressure gradient in water flooding,natural cores which have strong pressure sensitivity were flooded using simulated formation water in the laboratory.Porosity and permeability under various effective stresses and threshold pressure gradient were obtained from the experiments.The mathematical model of threshold pressure gradient considering pressure sensitivity was established through the experimental data’s regression by using least square method.The concept of variable threshold pressure gradient was put forward in which threshold pressure gradient will increase as effective stress increases in low permeability reservoir.So,reasonable production pressure drop and the appropriate water flooding timing should be determined so as to prevent the impact of threshold pressure gradient on production.
  • [1]
    李星民,杨胜来,张建伟,等.高凝油渗流中启动压力梯度及其影响因素研究[J].石油钻探技术,2009,37(5):114-117. Li Xingmin,Yang Shenglai,Zhang Jianwei,et al.Measurement of starting pressure gradient and affecting factors in the seepage process of high-wax oil[J].Petroleum Drilling Techniques,2009,37(5):114-117.
    [2]
    李晓良,王厉强,李彦,等.启动压力梯度动态变化对IPR方程影响分析[J].石油钻探技术,2007,35(2):70-72. Li Xiaoliang,Wang Liqiang,Li Yan,et al.Effect of starting pressure gradient dynamic change on IPR equation[J].Petroleum Drilling Techniques,2007,35(2):70-72.
    [3]
    李爱芬,刘敏,张化强,等.低渗透油藏油水两相启动压力梯度变化规律研究[J].西安石油大学学报:自然科学版,2010,25(6):47-54. Li Aifen,Liu Min,Zhang Huaqiang,et al.Experimental study on threshold pressure gradient of oil-water two-phase seepage in low permeability reservoirs[J].Journal of Xi’an Shiyou University:Natural Science Edition,2010,25(6):47-54.
    [4]
    熊伟,雷群,刘先贵,等.低渗透油藏拟启动压力梯度[J].石油勘探与开发,2009,36(2):232-235. Xiong Wei,Lei Qun,Liu Xiangui,et al.Pseudo threshold pressure gradient to flow for low permeability reservoirs[J].Petroleum Exploration and Development,2009,36(2):232-235.
    [5]
    田冷,何顺利,李秀生.低渗透气田砂岩储层应力敏感试井模型研究[J].石油钻探技术,2007,35(6):89-92. Tian Leng,He Shunli,Li Xiusheng.Study of well test of stress-sensitive sandstone in low permeability gas reservoir[J].Petroleum Drilling Techniques,2007,35(6):89-92.
    [6]
    孙峰,薛世峰,葛洪魁,等.疏松砂岩应力损害分析评价[J].石油钻探技术,2008,36(5):47-50. Sun Feng,Xue Shifeng,Ge Hongkui,et al.Numerical simulation of stress-induced wellbore damage in unconsolidated sand- stone reservoirs[J].Petroleum Drilling Techniques,2008,36(5):47-50.
    [7]
    李传亮.储层岩石的应力敏感性问题[J].石油钻采工艺,2006,28(6):86-88. Li Chuanliang.Discussion on the stress sensitivity of reservoir rocks[J].Oil Drilling Production Technology,2006,28(6):86-88.
    [8]
    SY/T 5336-2006 岩心分析方法[S]. SY/T 5336-2006 Practices for core analysis[S].
    [9]
    刘建军,刘先贵.有效压力变化对低渗透多孔介质孔隙度、渗透率的影响[J].地质力学学报,2001,7(1):41-44. Liu Jianjun,Liu Xiangui.The effect of effective pressure on porosity and permeability on low permeability porous media[J].Journal of Geomechanics,2001,7(1):41-44.
    [10]
    秦积舜.变围压条件下低渗砂岩储层渗透率变化规律研究[J].西安石油学院学报:自然科学版,2002,17(4):28-35. Qin Jishun.Variation of the permeability of the low-permeability sandstone reservoir under variable confined pressure[J].Journal of Xi’an Petroleum Institute:Natural Science Edition,2002,17(4):28-35.
    [11]
    孙广忠.岩体结构力学[M].北京:科学出版社,1994:109-182. Sun Guangzhong.Rock structural mechanics[M].Beijing:Science Press,1994:109-182.
    [12]
    李忠兴,韩洪宝.特低渗油藏启动压力梯度新的求解方法及应用[J].石油勘探与开发,2004,30(3):109-111. Li Zhongxing,Han Hongbao.The new calculated method and the application of starting pressure gradient in low permeability reservoir[J].Petroleum Exploration and Development,2004,30(3):109-111.
    [13]
    Farquhar R A, Smart B G D, Todd A C,et al. Stress sensitivity of low permeability sandstones from the rotliegendes sandstone. SPE 26501,1993.
    [14]
    阮敏,王连刚.低渗透油田开发与压敏效应[J].石油学报,2002,23(3):73-76. Ruan Min,Wang Liangang.Low-permeability oilfield development and pressure-sensitive effect[J]. Acta Petrolei Sinica,2002,23(3):73-76.
    [15]
    陈明强,蒲春生.变形介质低渗透油藏油井真实产能计算与分析[J].西安石油大学学报:自然科学版,2006,21(2):18-22. Chen Mingqiang,Pu Chunsheng.Calculation and analysis of the true productivity of a well of low permeable reservoirs of deformation medium[J].Journal of Xi’an Shiyou University:Natural Science Edition,2006,21(2):18-22.

Catalog

    Article Metrics

    Article views (3042) PDF downloads (3402) Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return