Method for drilling oil and gas wells

Details Method for drilling oil and gas wells Method for drilling oil and gas wells

E - Fixed Constructions

21

B

E21B 43/10 (2006.01)

Patent

CA 2575603

When drilling or completing an oil or gas well, it is often desirable to drill a borehole at an angle to the initial borehole. A process for deflecting a well tool towards the wall of a well bore comprises positioning within the well bore a radially expandable pipe designed to curve longitudinally when its diameter is expanded, expanding the diameter of the radially expandable pipe thereby causing the pipe to curve and passing the well tool through the curved pipe: The process is particularly suitable for through-tubing operations in which a lateral bore is initiated from a production well having within the well a smaller diameter production tubing (14) comprising (i) passing through the production tube (14) a radially expandable pipe (1) designed to curve longitudinally as its diameter is expanded, into a section of well bore (12) having a diameter greater than the diameter of the production tubing (14) (ii) expanding the diameter of the radially expandable pipe (1) thereby causing the pipe to curve, (iii) passing through the curved pipe a milling device or drill bit and (iv) milling the casing or drilling into the well bore wall.

Lorsqu'on fore un puits de pétrole ou de gaz, il est souvent souhaitable de forer un puits de forage selon un angle par rapport au puits initial. L'invention concerne un procédé permettant de dévier un outil vers la paroi d'un puits, qui consiste à positionner à l'intérieur de ce puits, un tuyau radialement extensible conçu pour s'incurver longitudinalement lorsque son diamètre est élargi; et à élargir le diamètre du tuyau radialement extensible, ce qui entraîne l'incurvation dudit tuyau et le passage de l'outil à travers le tuyau incurvé. Ledit procédé est particulièrement approprié pour effectuer des opérations de tubage dans lesquelles un trou latéral est exécuté à partir d'un puits de production renfermant un tubage de production (14) de diamètre plus petit. Ledit procédé consiste: i) à faire passer, à travers le tube de production (14), un tuyau (1) radialement extensible conçu pour s'incurver longitudinalement lorsque son diamètre est élargi dans une section de puits de forage (12) dont le diamètre est supérieur au diamètre du tubage de production (14); ii) à élargir le diamètre du tuyau (1) radialement extensible ce qui amène ledit tuyau à s'incurver; iii) et à faire passer à travers le tuyau incurvé un dispositif de broyage ou un trépan; et iv) à broyer le tubage de revêtement ou à forer dans la paroi du puits de forage.

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