Devices and systems for measurement of position of drilling...

E - Fixed Constructions – 21 – B

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E21B 19/20 (2006.01) E21B 47/04 (2006.01)

Patent

CA 2670700

A depth measurement system (100) for determining an absolute depth of a drill string uses a position acquisition device (104) to determine a length value for a joint or stand being added to the drill string. The position acquisition device receives a signal from a target object associated with the added joint. The processed signal can be an optical signal, a radio signal, an acoustic signal, or other suitable signal. Using techniques such as time lapse, Doppler effect or phase shift, the depth measurement system determines a position parameter such as distance or position based on the received signal. Thereafter, the processor determines the absolute depth of the drill string by summing a length of each joint making up the drill string and correcting for the position of the newly added joint.

La présente invention concerne un système de mesure de profondeur (100) pour déterminer une profondeur absolue d'un train de tiges de forage qui utilise un dispositif d'acquisition de position (104) pour déterminer une valeur de longueur pour un joint ou montant qui est ajouté au train de tiges de forage. Le dispositif d'acquisition de position reçoit un signal à partir d'un objet cible associé au joint ajouté. Le signal traité peut un signal optique, un signal radio, un signal acoustique, ou autre signal approprié. En utilisant des techniques telles que l'intervalle de temps, l'effet Doppler ou le déphasage, le système de mesure de profondeur détermine un paramètre de position tel qu'une distance ou une position sur la base du signal reçu. Après cela, le processeur détermine la profondeur absolue du train de tiges de forage en totalisant une longueur de chaque joint qui constitue le train de tiges de forage et en corrigeant la position du joint nouvellement ajouté.

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