Casing shoes and methods of reverse-circulation cementing of...

E - Fixed Constructions – 21 – B

Patent

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E21B 33/14 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2577774

A method having the following steps: running a circulation valve comprising a reactive material into the well bore on the casing; reverse-circulating an activator material in the well bore until the activator material contacts the reactive material of the circulation valve; reconfiguring the circulation valve by contact of the activator material with the reactive material; and reverse-circulating a cement composition in the well bore until the reconfigured circulation valve decreases flow of the cement composition. A circulation valve (20) for cementing casing in a well bore (1), the valve having: a valve housing connected to the casing and comprising a reactive material; a plurality of holes (2) in the housing, wherein the plurality of holes allow fluid communication between an inner diameter of the housing and an exterior of the housing, wherein the reactive material is expandable to close the plurality of holes.

Méthode mettant en jeu les étapes suivantes : faire passer une vanne de circulation comportant un matériau réactif dans l~alésage de puits sur le tubage ; mettre en circulation inverse un matériau activateur dans le puits de forage jusqu~à ce que le matériau activateur entre en contact avec le matériau réactif de la vanne de circulation ; reconfigurer la vanne de circulation en mettant le matériau activateur en contact avec le matériau réactif ; et mettre en circulation inverse une composition de ciment dans le puits de forage jusqu~à ce que la vanne de circulation reconfigurée réduise le flux de la composition de ciment. Une vanne de circulation (20) sert à cimenter le tubage d~un puits de forage (1), ladite vanne possédant : un logement de vanne relié au tubage et comportant un matériau réactif ; une pluralité de trous (2) dans le logement, ladite pluralité de trous permettant une communication de fluide entre un diamètre interne du logement et un extérieur du logement, le matériau réactif étant extensible pour fermer la pluralité de trous.

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