Core drilling latch assembly

Details Core drilling latch assembly Core drilling latch assembly

E - Fixed Constructions

21

B

E21B 25/02 (2006.01) E21B 17/00 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2214755

A core drilling latch assembly for use in terrestrial core drilling operations. The latch assembly incorporates features and elements which affect the flow of drilling fluids past the latch assembly and toward the drill bit, depending upon whether the latch assembly has contacted the landing ring in the drill string and whether the latch assembly has locked in place within the string. Accordingly, the latch assembly signals the drilling crew by pressure fluctuations when the latch assembly is in proper position within the drill string, and whether it is locked in position.

Dispositif de verrouillage pour le carottage utilisé lors de travaux de carottage sur la terre ferme. Le dispositif de verrouillage possède des caractéristiques et des éléments qui influent sur l'écoulement des fluides de forage plus loin que lui et en direction de l'outil de forage, qu'il se trouve en contact avec la bague de blocage dans le train de tiges ou qu'il se trouve en position verrouillée dans le train de tiges. Selon le cas, le dispositif de verrouillage indique à l'équipe de forage, au moyen de fluctuations de pression, à quel moment il atteint l'emplacement approprié dans le train de tiges, et s'il est en position verrouillée.

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