Assembly and method for hanging elongated tubing in well bore

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/04 (2006.01) E21B 19/22 (2006.01)

Patent

CA 2175267

An elongated tubing hanger assembly includes a bottom hanger sub installed upright on the well head of a well, a sealing assembly disposed within the bottom hanger sub, a slip bowl removably disposed within the bottom hanger sub immediately above and seated upon the sealing assembly, an annular retaining ring disposed about the upper periphery of the slip bowl to apply a force downward against the slip bowl, a running sub temporarily installed into an upper end portion of the bottom hanger sub to apply force downward against the slip bowl to compress and expand annular seal elements of the sealing assembly radially inward into a sliding sealing relationship with the tubing during its insertion, a slip element applied on the tubing and seated in an opening through the slip bowl to support the tubing in the well bore and to apply downward force, due to the weight of the tubing in the well bore, against the slip bowl to compress and expand the annular seal elements radially inward into the sealing relationship with the tubing, and a top hanger sub for attachment to the upper end portion of the bottom hanger sub after removal of the running sub. An elongated tubing hanging method includes the steps of installing the running sub in the bottom hanger sub during insertion of the tubing, then applying the slip element to the tubing and seating it in the slip bowl once the tubing is inserted, and finally removing the running sub and replacing it with a top hanger sub.

La présente invention vise un collier à coins allongé pour tubage de puits comportant un raccord de réduction inférieur monté à la verticale sur la tête du puits, un joint d'étanchéité disposé dans le raccord inférieur, une cuvette à tiroir amovible placée dans le raccord inférieur, directement sur le joint d'étanchéité, un anneau de retenue placé sur le bord périphérique supérieur de la cuvette et servant à exercer une poussée descendante sur cette dernière, un raccord mobile placé temporairement dans la portion d'extrémité supérieure du raccord inférieur et servant également à exercer une poussée descendante sur la cuvette de manière à comprimer et à étaler les éléments du joint d'étanchéité dans le sens radial et vers l'intérieur du tubage lorsque que ce dernier est introduit dans le puits, un élément coulissant placé sur le tubage et déposé dans une ouverture ménagée dans la cuvette, destiné à supporter le tubage et à exercer une poussée descendante sur la cuvette, attribuable au poids du tubage dans le puits, de manière à comprimer et à étaler les éléments du joint radialement et vers l'intérieur pour sceller le tubage, et un raccord supérieur à fixer sur la portion d'extrémité supérieure du raccord inférieur, une fois le raccord mobile retiré. La méthode connexe comprend les étapes suivantes, à savoir l'installation du raccord mobile dans le raccord inférieur au moment de l'introduction du tubage, la mise en place de l'élément coulissant dans la cuvette, une fois le tubage introduit, puis l'enlèvement du raccord mobile et la mise en place du raccord supérieur.

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