Modified lignosulfonate drilling fluid dispersants and process for the preparation thereof
AssigneeITT Corporation
InventorsMarten Reintjes, Craig D. Marken
Life of this patent
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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 complete. These derivative materials when reacted with metal salts such as chromium, ferrous, ferric, titanium, and zirconium produce oil well drilling fluid dispersant products with significantly improved performance and thermal properties.
Claims26
A method of making an additive for drilling mud from soluble base spent sulfite liquor comprising:
- ultrafiltering said soluble base spent sulfite liquor;
- separating resulting concentrate and filtrate;
- sulfonating the said concentrate;
- and
- reacting said sulfonated concentrate with a metal salt in the presence of an oxidizing agent, said metal salt being selected from the group consisting of chromium, ferrous, ferric, titanium and zirconium salts to produce a metal lignosulfonate additive for drilling mud.
A process for preparing from spent sulfite liquor a drilling mud additive having improved dispersing properties comprising the steps of;
- ultrafiltering said soluble base spent sulfite liquor;
- separating the resulting concentrate and filtrate;
- sulfonating said concentrate;
- and
- reacting said sulfonated concentrate with a metal salt in the presence of an oxidizing agent, said metal salt being selected from the group consisting of chromium, ferrous, ferric, titanium and zirconium salts to produce a metal lignosulfonate additive for drilling mud.
An additive for drilling mud comprising a metalized lignosulfonate having a molecular weight of between 80,000 and 140,000 and an average molecular chain length distribution of approximately 2.5, or less.
A drilling mud additive comprising ultrafiltered metalized lignosulfonate.
A chromeless oil well drilling mud dispersant comprising ultrafiltered metal sulfonated lignosulfonate wherein said metal is selected from the group consisting of ferrous, ferric, titanium and zirconium.
An additive for drilling mud comprising ultrafiltered metal sodium based lignosulfonate.
An additive for drilling mud comprising spray dried ultrafiltered metal sodium based lignosulfonate.
A drilling mud dispersant comprising ultrafiltered metalized lignosulfonate.
Dependencies are inferred from the claim text.