Artificial lift apparatus with automated monitoring...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/12 (2006.01) E21B 47/04 (2006.01) E21B 47/06 (2006.01)

Patent

CA 2400051

The present invention provides an artificial lift apparatus that monitors the conditions in and around a well and makes automated adjustments based upon those conditions. In one aspect, the invention includes a progressive cavity pump (PCP) (60) for disposal at a lower end of a tubing string in a cased wellbore. A pressure sensor (50a) in the wellbore adjacent the pump measures fluid pressure of fluid collecting in the wellbore. Another pressure sensor (37) disposed in the upper end of the wellbore measures pressure created by compressed gas above the fluid column and a controller (25) receives the information and calculates the true height of fluid in the wellbore. Another sensor (50b) disposed in the lower end the tubing string measures fluid pressure in the tubing string and transmits that information to the controller. The controller compares the signals for the three sensors and makes adjustments based upon a relationship between the measurements and preprogrammed information about the wellbore and the formation pressure therearound.

L'invention concerne un appareil d'ascension artificielle qui surveille les conditions dans un puits et autour de celui-ci, et effectue des réglages automatiques en fonction de ces conditions. Selon un mode de réalisation, l'invention concerne une pompe (60) à cavité progressive (PCP) destinée à évacuer un fluide au niveau d'une extrémité inférieure d'une colonne de tubage dans un sondage tubé. Un premier capteur (50a) de pression, placé dans le puits, adjacent à la pompe, mesure la pression fluidique du fluide collecté dans ledit puits. Un deuxième capteur (37) de pression disposé dans la partie supérieure du puits mesure la pression créée par un gaz comprimé au-dessus de la colonne fluidique, et un contrôleur (25) reçoit les informations et calcule la hauteur réelle dudit fluide dans le puits. Un troisième capteur (50b) disposé à l'extrémité inférieure de la colonne de tubage mesure la pression fluidique dans ladite colonne de tubage, et transmet ces informations au contrôleur. Ledit contrôleur compare les signaux des trois capteurs, et effectue des réglages en fonction du rapport entre les mesures et les informations préprogrammées relatives au puits et à la formation de pression autour dudit puits.

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