Monitoring flow rates while retrieving bottom hole assembly...

E - Fixed Constructions – 21 – B

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E21B 23/08 (2006.01) E21B 19/02 (2006.01) E21B 23/14 (2006.01)

Patent

CA 2725201

A bottom hole assembly in a casing-while-drilling operation is retrieved by reducing the density of the fluid in the casing string above the bottom hole assembly, creating an upward force on the bottom hole assembly. As the bottom hole assembly moves upward in the casing string, fluid is pumped into the upper end of the annulus and displaced fluid flows out of the upper end of the casing string. The flow rate of the fluid flowing into the upper end of the annulus and the flow rate of the displaced fluid flowing out of the casing string are monitored and compared.

Linvention concerne la récupération dun ensemble fond de puits dans une opération de tubage pendant le forage par la réduction de la densité du fluide dans la colonne de tubage au-dessus de lensemble fond de puits, en créant une force dirigée vers le haut sur lensemble fond de puits. A mesure que lensemble fond de puits se déplace vers le haut dans la colonne de tubage, un fluide est pompé dans lextrémité supérieure de lanneau et le fluide déplacé sécoule hors de lextrémité supérieure de la colonne de tubage. Le débit du fluide circulant dans lextrémité supérieure de lanneau et le débit du fluide déplacé circulant hors de la colonne de tubage sont surveillés et comparés.

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