Guide assembly and method

Details Guide assembly and method Guide assembly and method

E - Fixed Constructions

21

B

E21B 17/20 (2006.01) E21B 7/06 (2006.01) E21B 7/18 (2006.01) E21B 17/05 (2006.01) E21B 21/00 (2006.01) E21B 23/00 (2006.01) E21B 23/01 (2006.01) E21B 23/02 (2006.01) E21B 23/06 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2135402

An anchor (A) or guide assembly (GA) connects with workstring (WS) that may include a drill string (DS). The guide assembly (GA) includes an internal tubular member (ITM) to releasably connect with the workstring (WS). A tube (CT) is within the internal tubular member (ITM). The internal tubular member (ITM) is releasably secured with an outer tubular member (OTM). The internal tubular member (ITM) is releasably secured with an anchor surface. The workstring (WS) is released from the internal tubular member (ITM) to move relative to the guide assembly (GA) to extend the tube (CT) from the internal tubular member (ITM) for performing various operations. Orienting sub (38) enables operations to be performed at various azimuths and directions from a location, and in this event the outer tubular member (OTM) includes a heel window (58) and a face window (57) and the internal tubular member (ITM) has articulations (55', 55") to bend the internal tubular member (ITM) or tube (CT) therein laterally to direct the tube (CT) laterally of a location when the workstring (WS) is lowered.

Dispositif d'ancrage (A) ou de guidage (GA) se reliant à une colonne de tubage (WS) pouvant comprendre un train de tiges (CDS). Le dispositif de guidage (GA) comprend un élément tubulaire interne (ITM) se reliant de façon non permanente à la colonne de tubage (WS). Un tube (CT) se trouve à l'intérieur de l'élément tubulaire interne (ITM), qui est fixé de façon non permanente à un élément tubulaire externe (OTM) d'une part et à une surface d'ancrage d'autre part. La colonne de tubage (WS) se détache de l'élément tubulaire interne (ITM) pour se déplacer par rapport au dispositif de guidage (GA), afin d'allonger le tube (CT) à partir de l'élément tubulaire interne (ITM) pour exécuter diverses opérations. Un raccord d'orientation (38) permet d'exécuter les opérations à divers azimuts et dans diverses directions à partir d'un point donné et, dans ce cas, l'élément tubulaire externe (OTM) comprend une ouverture arrière (58) et une ouverture avant (57), tandis que l'élément tubulaire interne (ITM) présente des articulations (55' , 55Õ) lui permettant de se plier latéralement et, par conséquent, de courber le tube (CT) qu'il renferme et de le diriger latéralement par rapport à un point donné lorsque la colonne de tubage est descendue.

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