Template and system of templates for drilling and completing...

E - Fixed Constructions – 21 – B

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E21B 7/06 (2006.01) E21B 33/14 (2006.01) E21B 34/14 (2006.01) E21B 41/00 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2402623

One or more templates (20a-20c) are provided for circulating fluids in a main wellbore (92) and for drilling and completing at least one offset wellbore (160, 164) from the main wellbore. Each template has a body (21), an inlet leg (22), a main outlet leg (23), and an offset outlet leg (24). A straddle assembly (60) is mounted in the template to configure the tem- plate for fluid circulation. The straddle assembly, in coopera- tion with the inlet and main outlet legs, effects a downhole flow path which directs fluids from the inlet leg through body of the template and out the main outlet leg, bypassing the offset outlet leg. The straddle assembly is distally displaced from the tem- plate to reconfigure the template for drilling. A diverter (140) is placed in the body of the template upon displacement of the straddle assembly to define a drill string path from the inlet leg to the offset outlet leg. For two-letter codes and other abbreviations, refer to the "Guid- ance Notes on Codes and Abbreviations"appearing at the begin- ning of each regular issue of the PCT Gazette.

L'invention concerne un ou plusieurs gabarits (20a-20c) destinés à la circulation de fluides dans un puits (92) principal et au forage et à la complétion d'au moins un puits (160, 164) de limite depuis le puits principal. Chaque gabarit comprend un corps (21), un tube d'entrée (22), un tube de sortie principal (23), et un tube de sortie de limite (24). Un dispositif de chevauchement (60) est monté dans le gabarit afin de configurer ce dernier pour la circulation de fluides. Ce dispositif de chevauchement, en coopération avec le tube d'entrée et le tube de sortie principal, permet d'obtenir un circuit d'écoulement de fond qui dirige les fluides depuis le tube d'entrée, par le corps du gabarit, et vers le tube de sortie principal, en évitant le tube de sortie de limite. Le dispositif de chevauchement est déplacé de façon distale du gabarit afin de reconfigurer le gabarit pour le forage. Un déflecteur (140) est placé dans le corps du gabarit lors du déplacement du dispositif de chevauchement pour définir une voie pour le train de tiges depuis le tube d'entrée vers le tube de sortie de limite.

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