Operation mode of an oil well pumping unit for well...

F - Mech Eng,Light,Heat,Weapons – 04 – F

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F04F 5/54 (2006.01) E21B 43/12 (2006.01) F04F 5/10 (2006.01)

Patent

CA 2410267

The invention relates to pumps, in particular to oilwell pumping units for crude-oil production. The inventive oilwell pumping unit comprises a wall packer mounted on a pipe string, a back valve, a jet pump fitted with an active nosepiece, a mixing chamber, a diffusing cell and a central channel in order to supply a passive medium, and a seal assembly. Said unit is also provided with a filter and a perforator. The operation mode consists in mounting the jet pump on the pipe string and the perforator thereunder, arranging the wall packer in the annular space of the pipe string, supplying an ejecting liquid medium through the pipe string to the nosepiece of the jet pump, removing the liquid medium from the area beneath the packer with the aid of the jet pump and in draining the bench by blasting the perforator. The invention makes it possible to intensify an action on a well bore zone by optimizing different influencing factors for wells having an anomalously low formation pressure.

L'invention relève du domaine des pompes et notamment des unités de pompage destinées à l'extraction du pétrole de puits. L'unité de puits à jets contient un packer, un clapet anti-retour, une pompe à jets à buse active munie d'une chambre de mélangeage, d'un diffuseur et d'un canal central d'amenée de milieu actif ainsi qu'une unité d'étanchéité, le tout monté sur le train de tiges. En outre, l'unité est munie d'un filtre et d'un perforateur. Le procédé d'utilisation de l'unité consiste en ce qui suit: monter l'unité sur la colonne de production de la pompe à jets et, en dessous, le perforateur; monter le packer dans l'espace derrière la colonne de production; alimenter un milieu liquide d'éjection dans la colonne de production, à travers la buse de la pompe à jets; évacuer le milieu au moyen de la pompe à jets depuis la zone du puits sous le packer; et en faisant sauter le perforateur effectuer le drainage de la couche de production. Cela permet d'augmenter l'efficacité du traitement de la zone adjacente au puits de la couche de production grâce à l'optimisation de divers facteurs de traitement dans les puits présentant des pressions de puits anormalement basses.

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