E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/18 (2006.01) E21B 7/06 (2006.01) E21B 7/08 (2006.01) E21B 19/16 (2006.01) E21B 33/13 (2006.01) E21B 43/00 (2006.01) E21B 43/10 (2006.01) E21D 9/00 (2006.01)
Patent
CA 2198689
A method and apparatus for creating multiple branch wells from a parent well is disclosed. A multiple branching sub is provided for placement at a branching node of a well. Such sub includes a branching chamber and a plurality of branching outlet members. The outlet members during construction of the branching sub, have previously been distorted into oblong shapes so that all of the branching outlet members fit within an imaginary cylinder which is coaxial with and substantially the same radius as the branching chamber. After deployment of the branching sub via a parent casing in the well, a forming tool is lowered to the interior of the sub. The outlet members are extended outwardly by the forming tool and simultaneously formed into substantially round tubes. Next, each outlet member is plugged with cement, after which each branch well is drilled through a respective outlet member. If desired, each branch may be lined with casing and sealed to a branching outlet by means of a casing hanger. A manifold placed in the branching chamber controls the production of each branch well to the parent well.
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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