Method for drilling a lateral wellbore with secondary fluid...

E - Fixed Constructions – 21 – B

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E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2511249

The present invention generally provides an inexpensive method for drilling a multilateral wellbore where the pressure exerted on a formation of interest by a column of drilling fluid may be controlled. In one aspect, a method for drilling a lateral wellbore from a main wellbore is provided, including running a string of casing with an injection line connected thereto into the main wellbore, wherein the injection line is disposed along an outer side of the casing and a portion of the casing corresponding to a starting depth of the lateral wellbore is made from a drillable material; running a drillstring through the casing to the starting depth of the lateral wellbore, wherein the drillstring comprises a drill bit; injecting drilling fluid through the drill sting; and injecting a second fluid, having a density less than that of the drilling fluid, through the injection line at a rate corresponding to an injection rate of the drilling fluid to control hydrostatic pressure exerted by a column of the drilling fluid and the second fluid returning through the casing.

Méthode peu coûteuse pour forer un puits multilatéral permettant de régler la pression exercée sur une formation d'intérêt par une colonne de fluide de forage. Selon un aspect, il s'agit d'une méthode pour forer un puits latéral à partir d'un puits de forage principal qui comprend les procédés suivants : l'introduction d'une colonne de tubage reliée à une canalisation d'injection dans le puits de forage principal, la canalisation d'injection étant placée le long d'un côté extérieur de la colonne de tubage et une partie de la colonne de tubage à une profondeur initiale du puits de forage latéral étant faite d'un matériau forable; l'introduction d'un train de tiges de forage dans la colonne de tubage à une profondeur initiale du puits latéral, le train de tiges de forage comprenant un trépan; l'injection de fluide de forage dans le train de tiges de forage; l'injection d'un second fluide, dont la densité est inférieure à celle du fluide de forage, dans la canalisation d'injection à un débit correspondant au débit de circulation du fluide de forage pour régler la pression hydrostatique exercée par la colonne de fluide de forage et par le second fluide remontant par la colonne de tubage.

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