Hydraulic underreamer and sections for use therein

Details Hydraulic underreamer and sections for use therein Hydraulic underreamer and sections for use therein

E - Fixed Constructions

21

B

E21B 12/00 (2006.01) E21B 7/08 (2006.01) E21B 7/18 (2006.01) E21B 7/28 (2006.01) E21B 10/32 (2006.01) E21B 17/10 (2006.01) E21B 21/12 (2006.01)

Patent

CA 2355103

A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pumpl, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize pressure requirements and optimize hydraulic efficiency, and the mill section has a removable center assembly which allows effective well control when pulling the underreamer out of "live" well filled with a gas, such as methane.

La présente invention concerne un élargisseur permettant d'élargir un puits de forage, comprenant une garniture d'étanchéité améliorée, des déblais de forage, une pompe à jet et des sections de fraisage. Chacune des sections et leurs avantages associés font l'objet d'une description détaillée. La garniture d'étanchéité est conçue pour les exigences de pression et pour optimiser l'efficacité hydraulique. La section de fraisage possède un ensemble centre démontable qui permet de surveiller efficacement le puits lorsque l'on retire l'élargisseur du puits </= vivant >/= rempli d'un gaz, tel que le méthane.

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