Dowell Schlumberger Incorporated

Dowell, a Division of Schlumberger Technology Corporation

Hugo Hendriks

Pierre Maroy

Veronique Barlet-Gouedard

Roland Audebert

Joseph Janca

The invention relates to a new, chemically crosslinked PVA. Its application is that of a fluid loss control agent in fluids used in the oil industry, in particular cement slurries, separating fluids, or 'spacers', and drilling muds. Its advantages are that it does not delay the setting of the cement, that it has high temperature properties that are relatively insensitive to external conditions.

Cement composition containing chemically crosslinked polyvinyl alcohol

The invention relates to the cementing of high temperature wells. The retarder consists of a methylene phosphonic acid derivative and of a boric acid or a borate at least as acid as borax in an aqueous solution, in particular, Na pentaborate, in a preferred ratio of 0.08 to 0.92 parts by weight. A long setting time and a very swift compressive strength development are obtained at the same time.

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Saint-Etienne, France

Hugo Hendriks