C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/24 (2006.01)
Patent
CA 2268734
The present invention generally relates to water based drilling fluid compositions which contain at least one viscosity builder and at least one rheological control agent wherein said rheological control agent is an amphoteric polymer, the cationic groups of said amphoteric polymer being quaternary ammonium groups.
Van Der Horst Peter M.
Van't Zelfde Theodorus A.
Warren Brent
Akzo Nobel Nv
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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