C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 111/04 (2006.01) C09K 8/035 (2006.01) C10M 173/02 (2006.01)
Patent
CA 2480405
Lubricating additives for drilling fluids are prepared from semi-solid highly viscous and/or high molecular weight lubricants, such as polyalkylenes (e.g., polybutene), by steam jet cooking a mixture of starch, water, and the lubricant in order to uniformly suspend micrometer-sized lubricant droplets in an aqueous starch matrix. These additives avoid the need for toxic emulsifiers, surfactants, or short-chain hydrocarbon solvents for dispersing the lubricants. They impart lubricity to drilling fluids (muds) and also inhibit fluid loss in geological formations by enhancing the filtration control properties of the fluid.
L'invention concerne des additifs de lubrification pour fluides de forage, préparés à partir de lubrifiants semi-solides hautement visqueux et/ou de poids moléculaire élevé, tels que les polyalkylènes (par exemple le polybutène), par cuisson à jet de vapeur d'un mélange d'amidon, d'eau, et de lubrifiant afin de suspendre de manière uniforme les goutelettes de lubrifiant de dimension micrométrique dans une matrice d'amidon aqueux. Ces additifs permettent d'éviter le besoin d'émulsifiants toxiques, d'agents de surface, ou de solvants d'hydrocarbures à chaîne courte pour disperser les lubrifiants. Ils donnent un pouvoir lubrifiant aux fluides de forage (boues) et inhibent également la perte fluidique dans les formations géologiques en améliorant les propriétés de régulation de filtration du fluide.
Erhan Selim M.
Eskins Kenneth
Fanta George F.
Felker Frederick C.
Muijs Herman M.
Borden Ladner Gervais Llp
Shrieve Chemical Products
The United States Of America As Represented By The Secretary Of Agricul Ture
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