C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/22 (2006.01)
Patent
CA 2335762
Improved silicate drilling fluids are produced by the addition of tetra alkyl ammonium compounds, in particular tetra methyl ammonium hydroxide to silicate drilling fluid mud to lower the co-efficient of friction between drill string and wellbore. It has also been discovered that the same tetra alkyl ammonium lubricant compounds greatly lessen the viscosity breakdown of swelled hectorite clay in the presence of silicate. This allows the preparation of silicate drilling fluids not only with enhanced lubricity but having stable rheology at the higher temperature and pressures encountered in some drilling operations.
L'invention concerne la production de fluides de forage au silicate améliorés par ajout de composés d'ammonium tétra-alkyle, notamment d'hydroxyde d'ammonium tétra-méthylique à de la boue de fluide de forage au silicate pour réduire le coefficient de friction entre le train de sonde et le puits de forage. On a également découvert que les composés de lubrification d'ammonium tétra-alkyle réduisaient de manière considérable la perte de viscosité d'argile d'hectorite gonflante en présence de silicate. Cela permet de préparer des fluides de forage au silicate présentant non seulement un pouvoir lubrifiant amélioré mais possédant une rhéologie stable aux température et pressions élevées enregistrées lors de certaines opérations de forage.
Bass Jonathan L.
Mcdonald Michael J.
Urquhart John C.
National Silicates Ltd.
National Silicates Partnership
Ridout & Maybee Llp
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