C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
C01D 3/04 (2006.01) C09K 8/03 (2006.01) C09K 8/08 (2006.01) C09K 8/514 (2006.01) E21B 21/00 (2006.01)
Patent
CA 2218205
The invention provides: methods for (1) reducing the fluid loss of and (2) reducing the concentration of polymer required to provide a desired degree of fluid loss control to a well drilling and servicing fluid which contains at least one polymeric viscosifier, at least one polymeric fluid loss control additive, and a water soluble bridging agent suspended in a liquid in which the bridging agent is not soluble; well drilling and servicing fluids having decreased fluid loss and/or polymer concentration therein; and a water soluble bridging agent for such fluids in which the concentration of particles less than about 10 µm is greater than about 10% by weight. The methods and the well drilling and servicing fluids obtained thereby comprise providing the bridging agent therein with a particle size distribution such that at least 10% of the particles thereof are less than about 10 micrometers.
L'invention porte sur des méthodes pour (1) réduire la perte de fluide et (2) diminuer la concentration de polymères requis pour atteindre un niveau souhaité de perte du fluide utilisé dans les opérations de forage et d'entretien des puits, celui-ci contenant au moins un améliorant de viscosité polymérique, au moins un additif polymérique de contrôle des pertes, et un agent de pontage hydrosoluble en suspension dans un liquide dans lequel l'agent de pontage est non soluble; fluides utilisés pour le forage et l'entretien de puits possédant des caractéristiques de niveaux de perte et de concentration de polymères réduits; agent de pontage hydrosoluble pour utilisation dans des fluides dont la concentration de particules d'un diamètre inférieur à 10 micromètres est supérieure à environ 10 % en poids. Les méthodes et les fluides de forage et d'entretien des puits ainsi obtenus comportent l'utilisation d'un agent de pontage dont au moins 10 % des particules ont un diamètre inférieure à moins de 10 micromètres.
Dobson James W. Jr.
Harrison Jesse C. III
Kayga Paul D.
Kirby Eades Gale Baker
Texas United Chemical Company Llc
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