Method for liquifying chloride-based heavy brine well completion fluids
AssigneeFMC Corporation
InventorsRichard A. Brown, Robert D. Norris, Joseph C. Richards
Life of this patent
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Abstract
The invention provides a method to liquify a heavy brine completion fluid containing chlorides. The combination of a persulfate and hydrogen peroxide was found to be more effective than either compound alone, or than a peroxygen plus an activator.
Claims6
A method to liquify a chloride-based heavy brine completion fluid having a density greater than about 90 kg/m.sup.3 consisting essentially of incorporating into the completion fluid a sufficient amount of hydrogen peroxide and of a persulfate so that the hydrogen peroxide:persulfate mol ratio is between 9:1 and 1:9 and the combined hydrogen peroxide and persulfate content of the completion fluid is at least 1 millimol per liter, thereby liquifying the completion fluid absent added acceleration agents.
A method to liquify a chloride-based heavy brine completion fluid having a density greater than about 90 kg/m.sup.3 consisting essentially of incorporating into the completion fluid a sufficient amount of hydrogen peroxide and of a persulfate selected from the group consisting of ammounium persulfate, potammium persulfate, and sodium persulfate, so that the hydrogen peroxide:persulfate mol ration is between 9:1 and 1:9 and the combined hydrogen peroxide and persulfate content of the completion fluid is at least 1 millimol per liter, thereby liquifying the completion fluid absent added accelerating agents.
Dependencies are inferred from the claim text.