Method of drilling a wellbore

Details Method of drilling a wellbore Method of drilling a wellbore

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2702869

A method of drilling a wellbore (1) into an earth formation is disclosed. The method comprises arranging a drill string (6) and an expandable tubular element (8) coaxially in the wellbore, the drill string having an axially extending fluid passage (30), the tubular element surrounding the drill string and having a lower end bent (12) radially outward and in axially reverse direction so as to form an expanded tubular section (10) extending around a remaining tubular section of the tubular element, said lower end defining a bending zone of the tubular element, wherein an annular space is formed between the. drill string and the remaining tubular section.

Cette invention concerne un procédé de forage d'un puits de forage (1) dans une formation terrestre. Le procédé consiste à disposer un train de tiges de forage (6) et un élément tubulaire extensible (8) de manière coaxiale dans le puits de forage, le train de tiges de forage ayant un passage de fluide s'étendant dans un sens axial (30). Ledit élément tubulaire entoure le train de tiges de forage et présente une extrémité inférieure (12) courbée vers l'extérieur dans un sens radial et dans un sens axial inverse de sorte à former une section tubulaire déployée (10) s'étendant autour d'une section tubulaire restante de l'élément tubulaire. Ladite extrémité inférieure définit une zone de courbure de l'élément tubulaire, un espace annulaire étant formé entre le train de tiges de forage et la section tubulaire restante.

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