Drawdown apparatus and method for in-situ analysis of...

E - Fixed Constructions – 21 – B

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E21B 49/08 (2006.01) E21B 49/00 (2006.01) E21B 49/10 (2006.01)

Patent

CA 2385376

An apparatus and method capable of incrementally decreasing the borehole pressure at a variable rate by controlling a test volume within the borehole. The system includes an incrementally controllable pump, closed loop feedback and a controller for drawing down the pressure of a test volume to a level just below formation pressure. This incremental drawdown system will significantly reduce the overall measurement time, thereby increasing drilling efficency and safety.

La présente invention concerne un appareil et un procédé qui permettent de réduire de manière progressive la pression de fond de puits à une allure variable au moyen de la régulation d'un volume test à l'intérieur du trou de forage. Le système comprend une pompe à commande incrémentielle, une rétroaction en boucle fermée et une unité de commande pour abaisser la pression d'un volume test à un niveau qui se trouve être juste inférieur à la pression de la formation. Ce système de réduction incrémentielle de la pression permet de réduire significativement le temps global pour la mesure, ce qui augmente l'efficacité et la sécurité du forage.

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