Wellhead stuffing box for rotating rod string

Details Wellhead stuffing box for rotating rod string Wellhead stuffing box for rotating rod string

E - Fixed Constructions

21

B

E21B 33/03 (2006.01) E21B 33/08 (2006.01)

Patent

CA 2171495

A tubular mandrel is provided as a sleeve around the portion of the rod string polish rod extending through the stuffing box housing. The mandrel is coupled to the polish rod so that they rotate together. Bearings stabilize the mandrel within the housing. Stationary rotary seal means are provided in the housing to seal against the now-stabilized mandrel. Leakage and seal wear are improved when compared with the prior art approach of using compressed packing in direct contact with the polish rod to provide the rotary seal.

Un mandrin tubulaire est utilisé comme manchon autour de la partie de la tige polie de la colonne des tiges de pompage qui traverse le carter du presse-étoupe. Le mandrin est solidarisé avec la tige polie de manière qu'ils tournent ensemble. Des paliers stabilisent le mandrin à l'intérieur du carter. Des joints fixes pour mouvement rotatif sont placés dans le carter pour former une étanchéité contre le mandrin maintenant stabilisé. Cet agencement permet de minimiser les fuites et l'usure de l'étanchéité, ce qui constitue une amélioration par rapport à l'approche traditionnelle qui utilise une garniture comprimée en contact direct avec la tige polie pour former le joint pour mouvement rotatif.

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