中国石油勘探 ›› 2007, Vol. 12 ›› Issue (4): 59-62,8.

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鄂尔多斯盆地西峰油田压裂液对储层伤害的微观机理研究

管保山,周焕顺,程玉梅,任晓娟,刘静,谢旋   

  1. 成都理工大学能源学院;中国石油长庆油田公司勘探事业部;西安石油大学石油工程学院;中国石油长庆油田公司油气工艺技术研究院;中国石油长庆石油勘探局井下技术作业处研发中心 四川省成都市610059 中国石油长庆油田公司勘探事业部;陕西省西安市710021;陕西省西安市710065
  • 出版日期:2007-08-15 发布日期:2007-08-15
  • 基金资助:
    中国石油天然气集团公司“西峰特低渗透油藏综合评价及开发技术研究”(JT2005010)部分内容

MicrocosmicAnalysis of Damage of Fracturing Fluids to Reservoirs in Xifeng Oilfield of Ordos Basin

Guan Baoshan,Zhou Huanshun,Cheng Yumei,Ren Xiaojuan,Liu Jing and Xie Xuan   

  1. Guan Baoshan1,2,Zhou Huanshun2,Cheng Yumei2,Ren Xiaojuan3,Liu Jing4,Xie Xuan5 1 College of Energy Resources,Chengdu University of Technology,Chengdu City,Sichuan Province 610059;2 Exploration Department of PetroChina Changqing Oilfield Company,Xi’an City,Shaanxi Province 710021;3 College of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province 710065;4 Oil & Gas Technology Research Institute of PetroChina Changqing Oilfield Company,Xi’an City,Shaanxi Province 710021;5 Research and Development Center of the Down-hole Service Department of CNPC Changqing Petroleum Exploration Bureau,Xi’an City,Shaanxi Province 710021
  • Online:2007-08-15 Published:2007-08-15

摘要: 为了搞清压裂液引起低渗储层伤害的主要因素,优化压裂液体系,以最有效手段减小或消除这些伤害,采用真实砂岩模型进行了压裂液伤害机理的实验,并对照储层地质特征、流体性质和储层敏感性分析,对压裂液伤害储层的微观机理进行了分析研究。结果表明,压裂液引起的水锁伤害率为46.6%,储层压力系数低和压裂液引起残渣对储层伤害率为25.7%,对裂缝伤害率为60%。通过筛选合适的表面活性剂,改变岩石润湿性,来降低压裂液的水锁伤害;开发和研究低残渣压裂液体系,来降低压裂液残渣伤害,提高储层向裂缝渗流能力。这为开发适用于低渗油田的新型低伤害压裂液体系及相关技术提供了理论支持。

关键词: 压裂液, 微观机理, 砂岩模型, 伤害, 润湿性, 西峰油田, 鄂尔多斯盆地

Abstract: Experiments are conducted on the damage mechanism of fracturing fluids by using the real sandstone model to identify the reservoir damage factors caused by fracturing fluids, to optimize fracturing fluid system, and reduce or even eliminate the damage with the most effective method. What's more, the micro-mechanism of reservoir damage caused by fracturing fluids is analyzed on the basis of analyzing the reservoir geological characteristics, fluid properties, and reservoir sensitivity. Experimental results show that the rate of water-block damage caused by fracturing fluids is 46.6%, the rates of reservoir damage and fracture damage caused by residue due to the low reservoir pressure coefficient and fracturing fluids are 25.7% and 60% respectively. Rock wettability is altered by selecting out suitable surfactant so as to reduce the waterblock damage caused by fracturing fluids. The reservoir damage caused by fracturing fluid residue is reduced by developing the fracturing fluid system with low residue so as to improve the permeable capability of seepage flow from reservoirs to fractures. All of this provides theoretical support for the development of novel low-damage fracturing fluid systems and relevant technologies suitable to low permeability oilfields.

Key words: fracturing fluid, micro-mechanism, sandstone model, damage, wettability, Xifeng Oilfield, Ordos Basin

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