Wells – Processes – Placing fluid into the formation
Patent
1989-08-02
1991-12-03
Britts, Ramon S.
Wells
Processes
Placing fluid into the formation
166309, 166312, E21B 4326
Patent
active
050692836
ABSTRACT:
A hydraulic fracturing process in which substantial quantities of both nitrogen and carbon dioxide are incorporated into the fracturing fluid. Nitrogen and carbon dioxide are separately incorporated into an aqueous based fracturing fluid in amounts to provide a volume ratio of nitrogen to carbon dioxide at wellhead conditions within the range of about 0.2-1.0. The volume ratio of the total of carbon dioxide and nitrogen to the aqueous phase of the aqueous fracturing fluid at wellhead conditions within the range of about 1-4. The aqueous fracturing fluid containing the nitrogen and carbon dioxide is injected in the well under a pressure sufficient to implement hydraulic fracturing of the subterranean formation undergoing treatment. A thickening agent may be incorporated into water to provide a viscous aqueous based fracturing fluid to which the carbon dioxide and nitrogen are added. The carbon dioxide is incorporated in liquid phase and the nitrogen in gaseous phase. Propping agent is incorporated into at least a portion of the fracturing fluid. Addition of the propping agent takes place prior to addition of the carbon dioxide and nitrogen.
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Britts Ramon S.
Schoeppel R. J.
The Western Company of North America
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