Single riser with two wellheads

Details Single riser with two wellheads Single riser with two wellheads

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 17/00 (2006.01) E21B 17/10 (2006.01) E21B 33/047 (2006.01)

Patent

CA 2273101

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.

Ce système de guidage comprend deux tubes de guidage (13, 15) que l'on descend dans un puits à l'aide d'un tube conducteur (11). Ces tubes (13, 15) sont reliés ensemble par des cloisons de séparation (17) divisant le tube conducteur en deux moitiés. Chaque cloison (17) comprend deux demi-sections symétriques tournées dans des directions opposées. L'opérateur fait descendre un train de tige de forage (25) dans le tube conducteur, afin de forer un premier puits d'un diamètre plus petit, à la base du tube conducteur. Après avoir foré à la profondeur voulue, l'opérateur fait descendre un premier train de tige de cuvelage (29) dans le tube conducteur et à travers le nouveau puits de forage, le cuvelage (29, 31) étant situé d'un côté de chaque cloison (17) et cimenté sur place, puis il fait descendre la tige de forage de l'autre côté des portions (17) et recommence le forage et le cuvelage (31) d'un second puits.

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