Self-aligning stuffing box for pumpjack units

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/03 (2006.01) E21B 33/08 (2006.01) E21B 43/12 (2006.01) F04B 53/16 (2006.01) F16J 15/18 (2006.01)

Patent

CA 2228157

A self-aligning stuffing box (12) for a pumpjack unit (18) of the type having a polished rod (19) reciprocatingly extending therethrough and downhole to a pump (20) located at the lower end of a borehole. The stuffing box has a main body (21) that terminates in a tubing adaptor (14) at the lower end thereof by which it can be mounted to the upper end of the tubing of a wellhead. The main body has an annular seal assembly (36) that includes a pressure set seal pack (40, 40', 140, 140') for sealingly engaging the polished rod. The polished rod reciprocatingly extends through the seal assembly and main body. The seal assembly moves within the main body radially of the passageway to align the polished rod with the production tubing of the wellhead. A lower end of the seal assembly includes a compression piston (80) which is moved in proportion to the well tubing pressure, and thereby compresses the seal of the seal pack so that the seal pack is always properly adjusted.

La présente invention concerne une tête de circulation (12) à positionnement automatique destinée à un chevalet de pompage (18) du type à tige polie (19) animée d'un mouvement alternatif entre le chevalet et, au fond, une pompe (20) située à l'extrémité inférieure d'un forage. La tête de circulation comporte un corps principal (21) dont l'extrémité inférieure aboutit dans un adaptateur de tube de production permettant de monter la tête de circulation sur l'extrémité supérieure du tube de production d'une tête de puits. Le corps principal comporte un ensemble joint annulaire (36) pourvu d'une garniture de joint (40, 40', 140, 140') appliquée par pression de façon à établir avec la tige polie un contact étanche. Cette tige polie traverse en mouvement alternatif l'ensemble joint et le corps principal. Dans le corps principal, l'ensemble joint présente, par rapport à la lumière de passage, un jeu radial permettant de positionner la tige polie dans l'alignement du tube de production de la tête de puits. L'extrémité inférieure de l'ensemble joint comporte un piston compresseur (80) mobile en proportion de la pression régnant dans le tube de production, comprimant ainsi la garniture du joint pour que celle-ci soit toujours correctement ajustée.

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