Method for casing a wellbore

E - Fixed Constructions – 21 – B

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Details

E21B 43/10 (2006.01) E21B 19/22 (2006.01)

Patent

CA 2263240

Casing (15) is installed in a well in a folded collapsed condition by uncoiling it from a reel (87). Two strings of tubing (27, 29) extend continuously through the collapsed casing. One of the strings of tubing (27) is connected to a cement shoe (19) at teh lower end of the casing. An opening tool (31) is located above the cement shoe (19) and includes a piston (33). The other string of tubing (29) extends to a pressure chamber (35) that is between the piston (33) and the cement shoe (19). After the casing (15) is lowered with a running tool to the desired depth, cement is pumped down the first string of tubing (27), which flows back up the annulus surrounding the casing. A liquid is then pumped down the second string of tubing (29) into the pressure chamber (35), causing the piston (33) to push the conical forming head upward (38, 39) relative to the casing (15) and the strings of tubing (27, 29). The forming head (38, 39) opens the casing (15) from the collapsed condition into a cylindrical configuration. The running tool (55) retrieves the strings of tubing and the opening tool (31) at the conclusion of the opening and drifting process.

On installe un tubage (15) dans un puits, à l'état replié, en le déroulant depuis un touret (87). Deux colonnes de tubage (27, 29) s'étendent en continu dans le tubage replié. Une des colonnes (27) est reliée à un sabot en ciment (19) au niveau de l'extrémité inférieure du tubage. Un outil d'ouverture (31) est prévu au-dessus du sabot en ciment (19) et comporte un piston (33). L'autre colonne (29) s'étend jusque dans une chambre de pression (35) placée entre le piston (33) et le sabot en ciment (19). Une fois le tubage (15) descendu à la profondeur voulue au moyen d'un outil de pose, du ciment est pompé vers le bas vers la première colonne (27) et remonte jusqu'à l'espace annulaire entourant le tubage. On pompe ensuite un liquide de sorte qu'il descende vers la deuxième colonne (29) jusque dans la chambre de pression (35), le piston (33) poussant ainsi la tête de formage conique (38, 39) vers le haut par rapport au tubage (15) et aux colonnes (27, 29). La tête de formage (38, 39) ouvre le tubage (15) de sorte qu'il se déplie et prenne une forme cylindrique. L'outil de pose (55) permet d'enlever les colonnes et l'outil d'ouverture (31) à la fin du processus d'ouverture et de percement.

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