Wells – Processes – Cleaning or unloading well
Reexamination Certificate
2011-08-23
2011-08-23
Bates, Zakiya W. (Department: 3676)
Wells
Processes
Cleaning or unloading well
C166S279000, C166S304000, C166S306000, C166S402000
Reexamination Certificate
active
08002038
ABSTRACT:
The invention relates to cleaning wellbores and the near wellbore areas adjacent to a hydrocarbon bearing formations and coal bed methane formations. In a particular aspect, the invention relates to removing liquids such as water and/or oil from the formation near the wellbore. The cleaning and liquid removal is accomplished with liquid carbon dioxide or a treatment medium that includes liquid carbon dioxide. The treatment medium is injected into the wellbore through tubing in a controlled manner so that the treatment medium enters the formation in a liquid state, although a portion may be allowed to vaporize upon introduction into the wellbore. The treatment medium is then allowed to vaporize and loosen and entrain undesirable materials from the formation and from within the wellbore or casing, and mobilize water and oil present by effervescing and by dissolving. The water and oil may be blown or pumped to the surface or, if the present invention is practiced in a coal bed methane formation, may be driven into the coal bed methane formation such that it may no longer impose a barrier to methane production. In certain embodiments, the gaseous portion of the treatment medium is allowed to escape through the wellhead, carrying out the undesirable materials.
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Bates Zakiya W.
ConocoPhillips Company
LandOfFree
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