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1. (WO1997007183) DRILLING FLUID

Pub. No.:    WO/1997/007183    International Application No.:    PCT/GB1996/001989
Publication Date: Feb 27, 1997 International Filing Date: Aug 14, 1996
IPC: C07H 15/04
C09K 8/08
C09K 8/22
Applicants: SOFITECH N.V.
THE DOW CHEMICAL COMPANY
SCHLUMBERGER CANADA LIMITED
COMPAGNIE DES SERVICES DOWELL SCHLUMBERGER S.A.
REID, Paul, Ian
CRASTER, Bernadette, Teresa
CRAWSHAW, John, Peter
BALSON, Terence, George
Inventors: REID, Paul, Ian
CRASTER, Bernadette, Teresa
CRAWSHAW, John, Peter
BALSON, Terence, George
Title: DRILLING FLUID
Abstract:
A water-based drilling fluid (WBM) comprises as additive a reaction product of a polyhydroxyalkane and alkylene oxide. The polyhydroxyalkane is desirably based on a monosaccharide, and is preferably sorbitol. The alkylene oxide may comprise ethylene oxide (EO), propylene oxide (PO) and/or butylene oxide (BO). Good results have been obtained with additives including Sorbitol + 18EO, Sorbitol + 9PO, Sorbitol + 4EO + 6BO, Sorbitol + 6EO + 6BO, or Sorbitol + 6BO. Drilling fluids in accordance with the invention have been found in laboratory tests to exhibit improved shale inhibition properties as compared with known polyol containing WBM, particularly in the absence of added potassium ions. This is environmentally advantageous.