Methods and systems for reverse-circulation cementing in...

E - Fixed Constructions – 21 – B

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E21B 33/14 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2585080

Methods and systems for reverse-circulation cementing in subterranean formations are provided. An example of a method is a method of cementing casing (3) in a subterranean well bore (1), comprising inserting a casing into the well bore, the casing comprising a casing shoe (4); equipping the casing with a well head (2), and a casing inner diameter pressure indicator (13); flowing an equilibrium fluid (11) into the well bore; flowing a cement composition (15) into the well bore after the equilibrium fluid; determining from the well-bore pressure indicator when the well bore pressure has reached a desired value; discontinuing the flow of cement composition into the well bore upon determining that the well bore pressure has reached a desired value; and permitting the cement composition to set in the subterranean formation. Examples of systems include systems for cementing casing in a well bore. A marker detector (17) may be installed to detect tag fluids (16).

L~invention concerne des procédés et des systèmes de cimentation à circulation inverse dans les formations souterraines. Un exemple de procédé permettant de cimenter un cuvelage (3) dans un puits de forage souterrain (1), consiste à insérer un cuvelage dans le puits de forage, le cuvelage comprenant un sabot de cuvelage (4) ; à équiper le cuvelage d~une tête de puits (2), et d'un indicateur de pression de diamètre interne de cuvelage (13) ; à injecter un fluide d~équilibre (11) dans le puits de forage ; à injecter une composition de cimentation (15) dans le puits de forage après le fluide d~équilibre ; à déterminer à partir de l~indicateur de pression de puits de forage le moment auquel la pression de puits de forage a atteint une valeur désirée ; à interrompre l~écoulement de la composition de cimentation dans le puits de forage lorsque l~on a déterminé que la pression de puits de forage a atteint une valeur désirée ; et à laisser prendre la composition de cimentation dans la formation souterraine. Des exemples de systèmes englobent des systèmes de cimentation de cuvelage dans un puits de forage. On peut installer un détecteur de marqueur (17) pour détecter les fluides étiquettes (16).

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