Mono-diameter wellbore casing

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/16 (2006.01) E21B 23/00 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2432030

A mono-diameter casing formed when a tubular liner and an expansion cone are positioned within a new section of a wellbore and the tubular liner is overlapped with a pre-existing casing. A hardening fluid is injected into the section of the wellbore below the level of the expansion cone and into the annular region between the tubular liner and the wellbore. The inner and outer regions of the tubular liner are isolated. Then a non-hardening fluid is injected into the interior region of the tubular liner to pressurize it below the expansion cone. The overlapping portion of the pre-existing casing and the tubular liner are then expanded using an expansion cone.

Un gainage de puits de forage à diamètre unique est formé lorsqu'une couche tubulaire (210) et un diffuseur (205) sont placés à l'intérieur d'une nouvelle partie pour un puits de forage (100) et la couche tubulaire (210) est recouverte au moyen d'une gaine déjà existante (115). Un liquide de durcissement est injecté dans la partie du puits (100) qui se trouve au-dessus du niveau du diffuseur (205), dans la région annulaire entre la couche tubulaire (210) et le puits de forage (100). Les régions intérieures et extérieures de la couche tubulaire (210) sont isolées. Un liquide non durcissant est ensuite injecté dans la région intérieure de la couche tubulaire (210) afin de le mettre sous pression en dessous du diffuseur (205). La partie chevauchante du gainage existant (115) et la couche tubulaire (210) (210) sont ensuite dilatées au moyen du diffuseur (205).

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