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US 5,470,822 AGranted
Low-toxicity invert emulsion fluids for well drilling
AssigneeArco Chemical Technology, L.P.
InventorUsama E. Younes
Life of this patent
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Abstract
Low-toxicity invert emulsion fluids for well drilling are disclosed. The fluids comprise a non-hydrocarbon, non-mineral oil continuous phase and a dispersed aqueous phase. The continuous phase materials of the invention pass the 48 hour, LC50 Mysidopsis bahia bioassay test protocol.
Claims12
A low toxicity invert emulsion drilling fluid comprising:
- A. a non-hydrocarbon, non-mineral oil continuous phase comprising a polymer or a blend of polymers, each polymer having a polyoxyalkylene core having 2 to 3 end groups each end group selected from the group consisting of hydroxyl, C.sub.6 -C.sub.30 acyloxy, and C.sub.6 -C.sub.30 alkanamido, with the proviso that 50% or more of the total end groups must be selected from the group consisting of C.sub.6 -C.sub.30 acyloxy and C.sub.6 -C.sub.30 alkanamido, and in which the polyoxyalkylene core has a number average molecular weight within the range of from about 150 to about 1,500;
- B. a dispersed aqueous phase;
- C. at least one weight additive;
- and,
- D. at least one emulsifier.
2 more elements
Dependencies are inferred from the claim text.