Water-based drilling and well-servicing fluids with...

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C - Chemistry, Metallurgy

09

K

31/10

C09K 8/14 (2006.01)

Patent

CA 1296513

ABSTRACT OF THE DISCLOSURE Synthetic swellable layer silicates corresponding to the following formula MgO aMA bAl2O3 cS1O2 aH2O (I) in which M is Na+ and Li+ having an Na:Li ratio of at least 1; A is F-, OH- or ? O2- or a mixture thereof; a is 0.1 to 0.6; b is 0 to 0.3; c is 1.2 to 1.7; and n is 0 to 3Ø are used in water-based well-servicing fluids as a high- temperature-stable thixotrope substantially unaffected by alkaline earth metal ions.

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