Method of installing tubing into a lateral borehole

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 41/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2266928

A method of installing tubing (2) into a lateral borehole (4) which extends from a primary borehole (6), wherein the primary borehole is provided, at a point below the intersection of the primary and laterally boreholes, with a support device (8), comprises: running into the primary borehole a deflector device (10) until the deflector device is engaged with the support device with the deflector face (12) of the deflector device orientated to deflect tubing into the lateral borehole; surrounding the upper portion of the deflector device with an elongate tubular member (14) having a pre-formed window (16) in register with the mouth of the lateral borehole; sealing between the elongate tubular member and the casing (18) of the primary borehole at a location above the intersection between the primary borehole and the lateral borehole; and running a length of tubing through the elongate tubular member to be deflected by the deflector device through the pre-formed window into the lateral borehole.

L'invention concerne un procédé qui permet d'installer une colonne de production (2) dans un forage latéral (4) partant d'un forage primaire (6). Le forage primaire comporte un dispositif support (8) situé en-dessous de l'intersection du forage primaire et du forage latéral. Selon le procédé, on fait descendre dans le forage primaire un dispositif déflecteur (10) jusqu'à ce que celui-ci entre en contact avec le dispositif support, la face déflecteur (12) du dispositif déflecteur étant orientée de façon à dévier la colonne dans le forage latéral; on entoure la partie supérieure du dispositif déflecteur avec un élément tubulaire allongé (14) présentant une fenêtre préformée (16) calée avec la bouche du forage latéral; on ferme l'espace entre l'élément tubulaire et le tubage (18) du premier forage au-dessus de l'intersection du forage primaire et du forage latéral; et on descend une longueur de colonne dans l'élément tubulaire à dévier par le dispositif déflecteur au travers de la fenêtre préformée, de façon à la faire passer dans le forage latéral.

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