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1. CA2273101 - SINGLE RISER WITH TWO WELLHEADS

Office
Canada
Application Number 2273101
Application Date 04.12.1997
Publication Number 2273101
Publication Date 11.06.1998
Publication Kind A1
IPC
E21B 7/04
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
7Special methods or apparatus for drilling
04Directional drilling
E21B 17/00
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
E21B 17/10
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
10Wear protectors; Centralising devices
E21B 33/047
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
33Sealing or packing boreholes or wells
02Surface sealing or packing
03Well heads; Setting-up thereof
04Casing heads; Suspending casings or tubings in well heads
047for plural tubing strings
CPC
E21B 7/043
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
7Special methods or apparatus for drilling
04Directional drilling
043for underwater installations
E21B 17/00
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables;; Casings; Tubings
E21B 17/1035
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables;; Casings; Tubings
10Wear protectors; Centralising devices ; , e.g. stabilisers;
1035for plural rods, pipes or lines, e.g. for control lines
E21B 33/047
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
33Sealing or packing boreholes or wells
02Surface sealing or packing
03Well heads; Setting-up thereof
04Casing heads; Suspending casings or tubings in well heads
047for plural tubing strings
Applicants ABB VETCO GRAY INC.
Inventors BRIDGES, CHARLES D.
Priority Data 08759542 05.12.1996 US
Title
(EN) SINGLE RISER WITH TWO WELLHEADS
(FR) TUBE PROLONGATEUR A DEUX TETES DE TUBAGE
Abstract
(EN) A guidance system comprising two guide tubes (13, 15) are lowered into a well with a conductor (11). The guide tubes (13, 15) are connected together by partitions (17) which divide the conductor into two halves. Each partition (17) comprises two symmetrical half sections facing in opposite directions. The operator lowers a string of drill pipe (25) into the conductor to drill a first smaller diameter well at the bottom of the conductor. After drilling to the desired depth, the operator runs a first string of casing (29) down the conductor and through the new well bore. The casing (29, 31) is located on one side of each partition (17) and cemented in place. The operator then lowers the drill pipe down the other side of the partitions (17) and repeats the drilling and casing (31) of a second well.


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