The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2010
Filed:
Dec. 18, 2006
Liquid carbon dioxide cleaning of wellbores and near-wellbore areas using high precision stimulation
Dennis R. Wilson, Aztec, TX (US);
Dennis R. Wilson, Aztec, TX (US);
ConocoPhillips Company, Houston, TX (US);
Abstract
The invention relates to a method to clean a wellbore and the near wellbore area adjacent to the wellbore of a hydrocarbon bearing formation adjacent to the production zone of the wellbore. The invention includes a method to clean a casing inserted into a wellbore and a method for cleaning a wellbore of fracturing fluid, with or without proppant. Each of the methods includes the steps of injecting a treatment medium comprising liquid carbon dioxide into a wellbore where pressure within the wellbore is regulated to either maintain the treatment medium in the liquid state, or allow at least a portion of the treatment medium to vaporize upon introduction into the wellbore. The treatment medium vaporizes to loosen and/or entrain undesirable materials from within the wellbore or casing and escape through the wellhead, carrying with it the undesirable materials.