Method and apparatus for establishing branch wells at a node of

Details Method and apparatus for establishing branch wells at a node of Method and apparatus for establishing branch wells at a node of

1997-02-11

1999-08-31

Dang, Hoang C.

Wells

Processes

Parallel string or multiple completion well

166 50, 1661176, 1662421, 166381, E21B 706, E21B 4314

Patent

active

059441070

ABSTRACT:
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.

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