Modified lignosulfonate drilling fluid dispersants and...

Details Modified lignosulfonate drilling fluid dispersants and... Modified lignosulfonate drilling fluid dispersants and...

C - Chemistry, Metallurgy

09

K

260/133, 31/19

C09K 8/20 (2006.01) C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1283406

MODIFIED LIGNOSULFONATE DRILLING FLUID DISPERSANT AND PROCESS FOR THE PREPARATION THEREOF ABSTRACT The present invention relates to modified lignosulfonate materials and the process for their preparation. These modified lignosulfonates result from the sulfonation of ultrafiltered lignosulfonates by reaction with sulfite-bisulfite salts. The removal of sugars and other low molecular weight impurities makes formation of these new modified lignosulfonates more completes. These derivative materials when reacted with metal salts such as chromium, ferrous, titanium, and zirconium produce oil well drilling fluid dispersant products with significantly improved performance and thermal properties.

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