C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/10
C09K 8/20 (2006.01)
Patent
CA 1199485
HEC-BENTONITE COMPATIBLE BLENDS ABSTRACT OF THE DISCLOSURE Drilling fluids, both fresh and saline, containing additives and compositions, predominantly nonionic in nature, for the beneficiation of bentonite in such drilling slurries. The primary class of compounds employed are ethylene oxide derivatives, nonionic polysaccharides and under certain specified conditions anionic polysaccharides. In fresh water slurries polyethylene glycol derivatives of significantly different molecular weights are employed with nonionic poly- saccharides for optimizing the rheological characteristics of bentonite slurries. The anionic polysaccharide can be deleted from the blend for economic reasons. In such formulations (i.e., a polyethylene glycol-nonionic polysaccharide blend) the molecular weight of the polyethylene glycol is important in obtaining low shear-rate yield stress characteristics in fresh water slurries, at elevated temperatures for maximum drill solids carrying capacity within the wellbore. The blend of beneficiating agents affects a decreasing yield stress character with decreasing temperature to permit drill solids removal at ambient surface conditions. In saline solutions polyethylene glycols of intermediate molecular weight (less than 30,000) and nonionic polysaccharides are effective in inhibiting syneresis (i.e., phase separation) and in providing good slurry rheological profiles at elevated temperatures. Anionic poly- saccharides are utilized (particularly in saline solutions) to ensure the proper structuring of the bentonite wellbore filter cake for fluid loss control and to ensure optimum rheological characteristics of the slurry with the ternary blend of beneficiating agents at intermediate reservoir temperatures. S P E C I F I C A T I O N
429074
Hopley William G.
Union Carbide Corporation
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