Safety apparatus for oil drilling derrick

B - Operations – Transporting – 66 – C

Patent

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Details

B66C 15/06 (2006.01) B66C 13/50 (2006.01) E21B 15/00 (2006.01) E21B 19/02 (2006.01)

Patent

CA 2235254

A safety apparatus for a derrick on an oil drilling rig includes a cable having a first end for connection to one side of the derrick at a predetermined location spaced below the crown. A series of pulleys is secured to the oil derrick to define a predetermined path for the cable extending from the fixed first end across the derrick at the predetermined location and then down the derrick to a location adjacent the lower end. The portion of the cable extending across the derrick is positioned in the path of a traveling block as it is pulled up the derrick. An alarm device is linked to the cable to produce an output alarm signal if the cable is pulled up by the traveling block as it approaches the top of the derrick, giving the operator a warning that the traveling block should be stopped to avoid impact with the crown.

Cette invention concerne un dispositif de sécurité pour mât de forage pétrolier. L'objet de l'invention fait appel à un câble attaché par un bout à un côté du mât, à une distance précise du sommet du mât. Plusieurs poulies sont fixées au mât pour faire suivre au câble un trajet prédéterminé entre son point de fixation au côté du mât et un point situé plus bas, près de la base du mât. La partie du câble qui traverse d'un côté à l'autre du mât se trouve sur le trajet d'un moufle mobile qui est élevé vers le sommet du mât. Un dispositif d'alarme relié au câble produit un signal d'alerte dès que le moufle mobile tire ce câble vers le haut, à l'approche du sommet du mât. Ainsi, l'opérateur est averti à temps de la nécessité d'arrêter le moufle pour éviter qu'il ne heurte le sommet du mât.

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