Method and apparatus for determining fluid level in oil wells

E - Fixed Constructions – 21 – B

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E21B 47/04 (2006.01) G01F 23/00 (2006.01)

Patent

CA 2234730

A method and apparatus for continuously monitoring fluid level in an oil well, by measuring changes in the weight of the oil well tubing which result from changes in the buoyancy of the tubing caused by the rise and fall of fluid level within the oil well. In the apparatus of the invention, a transducer is either affixed to the downhole tubing of the oil well, or alternatively, is affixed to the drive head support structure of a well having a progressive cavity well pump. The transducer continuously senses changes in the weight of the tubing as the buoyancy of the tubing changes in proportion to the rise and fall of fluid level within the well. The transducer is preferably connected to a control unit which, in turn, is connected to the pump motor and which functions to automatically control the pump motor as a function of fluid level within the well.

La présente invention a pour objet une méthode ainsi qu'un dispositif permettant d'effectuer la surveillance continue du niveau de fluide dans un puits de pétrole par mesurage des fluctuations du poids du tubage dans le puits de pétrole, fluctuations qui accompagnent les changements de flottabilité du tubage, qui sont occasionnés par les augmentations et les baisses de niveau du fluide dans le puits de pétrole. Le dispositif proposé dans la présente invention comporte un transducteur qui est fixé soit en conditions de fond du puits de pétrole, soit au niveau de la structure support de tête de tube dans un puits à pompe à cavité intermédiaire. Le transducteur capte de façon continue les fluctuations du poids du tubage au gré des changements de flottabilité du tubage, en proportion des fluctuations du niveau du fluide dans le puits de pétrole. De préférence, le transducteur est relié à un module de commande qui est lui-même raccordé au moteur de la pompe, et dont la fonction est de commander automatiquement le moteur de la pompe en fonction du niveau de fluide dans le puits.

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