Primary well cementing methods and apparatus

Details Primary well cementing methods and apparatus Primary well cementing methods and apparatus

E - Fixed Constructions

21

B

E21B 33/14 (2006.01) E21B 33/16 (2006.01)

Patent

CA 2233468

The present invention provides improved primary well cementing methods and apparatus. The methods basically comprise the steps of releasing a displacement plug into the casing to be cemented and pumping a first displacement fluid behind the displacement plug while measuring the quantity of the first displacement fluid required to land the displacement plug on a float collar or the like connected near the bottom of the casing, releasing a bottom cementing plug into the casing and pumping a cement slurry behind the bottom cementing plug in a predetermined quantity and then releasing a top cementing plug into the casing and pumping a second displacement fluid behind the top cementing plug in a quantity substantially equal to the measured quantity of the first displacement fluid thereby ensuring that the cement slurry is not under or over displaced in the annulus between the casing and the well bore.

Cette invention concerne un dispositif et des méthodes améliorés de cimentation de puits principal. La méthode comprend essentiellement le largage d'un bouchon de déplacement dans le tubage à cimenter, le pompage d'un premier fluide de déplacement derrière le bouchon de déplacement, fluide dont on doit mesurer en même temps la quantité nécessaire pour amener le bouchon jusque sur un anneau de retenue ou objet analogue disposé au bout inférieur du tubage, le largage d'un bouchon de cimentation inférieur dans le tubage, le pompage d'un coulis de ciment derrière ce bouchon en quantité appropriée, suivi enfin du largage d'un bouchon de cimentation supérieur dans le tubage et du pompage d'un second fluide de déplacement en quantité sensiblement égale à la quantité mesurée du premier fluide de déplacement de façon à s'assurer le coulis de ciment ne se retrouve pas en quantité trop faible ou trop grande dans l'espace annulaire entre le tubage et le puits de forage.

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