| 摘要 |
A METHOD AND APPARATUS FOR CREATING MULTIPLE BRANCH WELLS FROM A PARENT WELL IS DISCLOSED. A MULTIPLE BRANCHING SUB (30) IS PROVIDED FOR PLACEMENT AT A BRANCHING NODE OF A WELL. SUCH SUB INCLUDES A BRANCHING CHAMBER (32) AND A PLURALITY OF BRANCHING OUTLET MEMBERS (34, 36, 38). THE OUTLET MEMBERS (34, 36, 38) DURING CONSTRUCTION OF THE BRANCHING SUB (32), HAVE PREVIOUSLY BEEN DISTORTED INTO OBLONG SHAPES SO THAT ALL OF THE BRANCHING OUTLET MEMBERS IT WITHIN AN IMAGINARY CYLINDER WHICH IS COAXIAL WITH AND SUBSTANTIALLY THE SAME RADIUS AS THE BRANCHING CHAMBER (32). AFTER DEPLOYMENT OF THE BRANCHING SUB (30) VIA A PARENT CASING IN THE WELL, A FORMING TOOL (200) IS LOWERED TO THE INTERIOR OF THE SUB. THE OUTLET MEMBER (34, 36, 38) ARE EXTENDED OUTWARDLY BY THE FORMING TOOL (200) 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 (32) CONTROLS THE PRODUCTION OF EACH BRANCH WELL TO THE PARENT WELL. |
