E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/18 (2006.01) E21B 6/06 (2006.01) E21B 7/06 (2006.01) E21B 7/20 (2006.01) E21B 17/20 (2006.01)
Patent
CA 2479236
The invention concerns a method of directional drilling of a hole (3), for which is used a drill support (4) in the form of a flexible continuous drill tube with proximal end and distal end, that at the end of the drill support's distal end is connected a bottom hole assembly (5) comprising a drill machine (12) and a percussion tool (8) acting on a drill bit (13) for forming a drill string, which is fed into the gradually formed hole. To avoid and minimise the occurrence of "stick slip" during directional drilling, the method include, indexing the drill bit (13) while drilling is in progress by gradually rotating around its axis between each blow of the drill bit, performing the indexing in a area between the drill support's (4) distal end and the drill bit, the indexing taking place when the drill bit is moving away from a rock surface or being in its retracted position, carrying out the indexing by means of a rotatable fluid activated motor, a liquid driving fluid for which is fed via a passage extended through the drill support.
L'invention porte sur un procédé et un dispositif de forage dirigé d'un trou (3), et en particulier de forage de trous incurvés d'exploration et d'exploration à flanc de coteau ou similaire. A cet effet on utilise un support de forage (4) en forme de tube flexible continu présentant une extrémité distale et une extrémité proximale, dont la pointe de l'extrémité distale est reliée à une unité de fond de puits (5) comprenant un trépan, et qui permet de former un train de tiges (13) qui avance dans le forage en progression. Pour éviter ou réduire la survenue de broutage" pendant le forage dirigé, le support de forage (4) est fixé par son extrémité proximale pour l'empêcher de tourner hors du forage tandis que s'effectue le mouvement de rotation du trépan autour d'un axe s'étendant en direction du forage dans la zone séparant l'extrémité distale du support de forage, du trépan, alors que le forage progresse.
Gowling Lafleur Henderson Llp
Wassara Ab
LandOfFree
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