Invention Application
US20040157749A1 Method for reducing permeability restriction near wellbore 失效
降低井筒附近渗透率限制的方法

  • Patent Title: Method for reducing permeability restriction near wellbore
  • Patent Title (中): 降低井筒附近渗透率限制的方法
  • Application No.: US10364717
    Application Date: 2003-02-11
  • Publication No.: US20040157749A1
    Publication Date: 2004-08-12
  • Inventor: John W. ElyBradley C. WoltersWilliam D. McCain
  • Main IPC: E21B043/00
  • IPC: E21B043/00
Method for reducing permeability restriction near wellbore
Abstract:
Method is provided for increasing the productivity of gas wells producing from reservoirs where retrograde condensation occurs around the wells. An oil-wetting surfactant is injected in a solvent to oil wet the formation for a selected distance around a well or a hydraulic fracture intersecting the well. A pre-flush liquid, such as carbon dioxide, alcohol or similar products and mixtures thereof, may be used to reduce water saturation before injection of the surfactant. The method may also be applied to increase the productivity of oil wells producing from reservoirs where breakout of solution gas occurs near the well.
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