Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate
2005-03-01
2005-03-01
Tucker, Philip C. (Department: 1712)
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
C507S925000
Reexamination Certificate
active
06861393
ABSTRACT:
A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in increased viscosity of the fluid.
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Foreign communication from a related counterpart appplication dated Sep. 1, 2004.
Zamora M. et al, “ Controlling Barite Sag Can Reduce Drilling Problems”, Oil and Gas Journal, Pennwell Publishing Co., Tulsa, Oklahoma, USA, vol. 92, no. 7, Feb. 14, 1994, pp. 47-48, 50-52, entire document.
Leith Christopher Duncan
Paterson Andrew Forbes
Temple Colin
Halliburton Energy Service,s Inc.
Roddy Craig W.
Tripp Karen B.
Tucker Philip C.
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