Aluminum hydroxide gel system

Details Aluminum hydroxide gel system Aluminum hydroxide gel system

C - Chemistry, Metallurgy

09

K

31/33

C09K 8/16 (2006.01)

Patent

CA 1135493

- 13 - ALUMINUM HYDROXIDE GEL SYSTEM ABSTRACT OF THE DISCLOSURE A1(OH)3 is added to a drilling fluid system together with other optional additives such as carboxymethyl cellulose, bentonite, polymer, potash, barite, etc., and acts as a primary viscoxifier. The principal advantage is due to the fact that it is an amphoteric material, i.e. it is soluble in both acid and alkaline conditions, but is insoluble in neutral or moderate pH conditions. This means that the entire mud system and its filter cake are completely acid or strong alkali soluble so that the entire colloidal suspension can be changed to a clear fluid and the filter cake completely dissolved by simply lowering or raising the pH of the system, a characteristic that is particularly desirable if formation damage is to be avoided and when the drill string is differ- entially stuck.

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