William D Mccain

US Patent:

6945327, Sep 20, 2005

Filed:

Feb 11, 2003

Appl. No.:

10/364717

Inventors:

John W. Ely - Houston TX, US
Bradley C. Wolters - College Station TX, US
William D. McCain - College Station TX, US

Assignee:

Ely & Associates, Inc. - Houston TX

International Classification:

E21B043/12
E21B043/26

US Classification:

166263, 16625001, 1663051, 1663081, 166371, 507202, 507266

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.