Guided drilling system with shock absorber

Details Guided drilling system with shock absorber Guided drilling system with shock absorber

E - Fixed Constructions

21

B

E21B 7/02 (2006.01) E21B 4/14 (2006.01) E21B 6/00 (2006.01) E21B 15/00 (2006.01) E21B 17/07 (2006.01) E21B 19/22 (2006.01)

Patent

CA 2203736

There is provided a guided drilling system and an in-the-hole shock absorber adapted thereto. The guided drilling system includes a drill string configured to continuously and accurately bore a hole in the ground without the need to periodically break the connection of the drill string. In order to protect the components of the drilling system a hollow core shock absorber for percussive drill strings has been designed. A centrally disposed coil spring transmits the necessary thrust to a percussive hammer while providing a resilient cushion for vibration displacement Pressurized fluid flows through the center of the shock absorber through a poppet valve.

Système de forage guidé et amortisseur fond-de-trou adapté. Le système de forage guidé comprend un train de tiges configuré de manière à forer de manière continue et précise un trou dans le sol sans avoir à dévisser les raccords du train de tiges. Pour protéger les composants du système de forage, un amortisseur comportant un évidement a été conçu pour être employé avec les trains de tiges utilisés pour le forage par percussion. Un ressort central hélicoïdal transmet la poussée nécessaire à un marteau de percussion tout en constituant un coussin élastique pour le déplacement des vibrations. Un fluide sous pression s'écoule par le centre de l'amortisseur par une soupape à clapet.

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