Methods and ultra-low density sealing compositions for...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 26/14 (2006.01) C09K 8/44 (2006.01) C09K 8/46 (2006.01) E21B 33/13 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2460441

The present invention provides methods and ultra-low density sealing compositions for sealing pipe in well bores penetrating formations which readily fracture at low hydrostatic pressures. A method of the invention basically comprises the steps of providing a hardenable ultra-low density sealing composition comprised of an epoxide containing liquid, a hardening agent, a hardening accelerating agent, a light weight filler and hollow glass michrospheres having a density in the range of from about 5 to 8.5 pounds per gallon, placing the sealing-composition in the annulus between the pipe to be sealed and the walls of the well bore and allowing the sealing composition to harden therein.

L'invention concerne des procédés et des compositions de cimentation d'étanchéité à ultra-faible densité qui permettent d'obturer un tube dans des trous de forage pénétrant dans des formations qui se fracturent facilement à de faibles pressions hydrostatiques. Un procédé comprend les étapes consistant à produire une composition d'étanchéité à ultra-faible densité durcissable qui comprend un liquide contenant un époxyde, un agent de durcissement, un agent d'accélération de durcissement, une charge légère et des microsphères de verre creuses présentant une densité comprise entre environ 5 et 8,5 livres par gallon; à placer la composition d'étanchéité dans l'espace annulaire entre le tube à rendre étanche et les parois du trou de forage; et à y laisser durcir la composition d'étanchéité.

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