Improved pump drive head with integrated stuffing box and clamp

Details Improved pump drive head with integrated stuffing box and clamp Improved pump drive head with integrated stuffing box and clamp

E - Fixed Constructions

21

B

E21B 43/12 (2006.01)

Patent

CA 2522257

The improved pump drive head (1) has an integrated stuffing box (9) and comprises: a power transmission (3, 4) coupled to the rotating pump driveshaft (8) within a crude oil well; a stuffing box (9) to retain the pressure; a thrust assembly (6) adapted to take the tensile force exerted on said pump shaft. It further has said power transmission comprised of a tube (5, 16) arranged to be rotated coaxially with the shaft (8) and having at least two different diameters. The rotary seals (20; 50) fit over the small outside diameter of the tube to establish fluid-tightness between said tube and the body (19) of the stuffing box. The working diameter (51) of the seals (20; 50) is smaller than the large outside diameter of said tube (5, 16). Static seals (17) are provided between the tube and the shaft (8). Thus, the static seals (17) and rotary seals (20; 50) are adapted to come away along with said tube and the retainer ring (22) for the seals. Advantageously, associated with said head is the improved clamp (10) for locking the rotary pump driveshaft (8) in crude oil wells, which clamp includes a jaw pair (35, 36), a pull one (35) and a push one (36) operated by means of a screw (38) acting with its end on one jaw (35) and engaging a threaded hole in the other jaw (36).

L'invention concerne une tête de commande (1) de pompe améliorée qui comporte un presse-étoupe (9) intégré, et comprend : une transmission de puissance (3, 4) couplée à l'arbre de commande (8) de pompe rotative dans un puits de pétrole brut ; un presse-étoupe (9) pour retenir la pression ; un ensemble poussée (6) conçu pour utiliser la force de traction exercée sur l'arbre de pompe. La transmission de puissance est en outre mise en oeuvre par un tuyau (5, 16), placé de manière à tourner coaxialement avec l'arbre (8) et qui présente au moins deux diamètres différents. Des joints rotatifs (20, 50) sont mis en place sur le petit diamètre extérieur du tuyau afin d'assurer une étanchéité aux fluides entre ledit tuyau et le corps (9) du presse-étoupe. Le diamètre de travail (51) des joints (20, 50) est inférieur au grand diamètre extérieur du tuyau (5, 16). Des joints statiques (17) sont prévus entre le tuyau et l'arbre (8). Les joints statiques (17) et les joints rotatifs (20, 50) peuvent ainsi être enlevés avec le tuyau et la bague de retenue (22) des joints. De façon avantageuse, un système de serrage (10) amélioré associé à la tête sert à verrouiller l'arbre de commande (8) de pompe rotative dans le puits. Ce système de serrage comprend deux mâchoires (35, 36), une mâchoire de traction (35) et une mâchoire de poussée (36), actionnées au moyen d'une vis (38) dont une extrémité agit sur une mâchoire (35) et s'engage dans un trou fileté de l'autre mâchoire (36).

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