Cementing plug

Details Cementing plug Cementing plug

E - Fixed Constructions

21

B

E21B 33/16 (2006.01) E21B 21/10 (2006.01) E21B 33/05 (2006.01) E21B 34/06 (2006.01)

Patent

CA 2218106

The invention provides a bottom cementing plug (594) which is releasably attached to a top plug (584) by means of a tubular sleeve (550) and shear pins (553). Instead of shear pins a shear ring, which may be segmented, and which is integral with the tubular sleeve, may be arranged. The tubular sleeve (550) comprises first openings (565) which are covered by burst plates (570) for allowing cement to pass after having set the plug on the float shoe at the casing bottom. The tubular sleeve (550) may comprise second openings (554) covered by burst plates (555) to allow the cementing process to be performed in case that the top plug has been launched together with the bottom plug. The invention further provides a dart launching device, where the darts are arranged in a sleeve coaxially with and radially spaced from the housing of the launching device. A fluid diverter is arranged at the top of the launching device for diverting the fluid into the annular space between sleeve and housing in order to prevent pressure overload on the plungers which hold the darts in place before they are launched.

L'invention porte sur un bouchon de cimentation inférieur (594) muni d'un dispositif réversible de fixation à un bouchon de cimentation supérieur (584) par l'intermédiaire d'un manchon tubulaire (550) et de goupilles de cisaillement (553), ou d'un anneau de cisaillement éventuellement segmenté faisant partie intégrante du manchon. Le manchon tubulaire (550) comporte de premières ouvertures (565) recouvertes de plaques de rupture (570) permettant le passage du ciment après avoir placé le bouchon sur le sabot flottant à la base du tubage. Le manchon tubulaire (550) peut comporter de secondes ouvertures (565) recouvertes de plaques de rupture (555) permettant de procéder à la cimentation lorsque le bouchon supérieur a été lancé avec le bouchon inférieur. L'invention porte également sur un système de lancement de clapets dans lequel les clapets sont disposés dans un manchon coaxialement et à une certaine distance radiale de l'enceinte du dispositif de lancement. Un déviateur de fluide est placé au sommet du dispositif de lancement pour défléchir le fluide vers l'espace annulaire compris entre le manchon et l'enceinte de manière à empêcher les surpressions sur les pistons qui maintiennent les clapets en place avant leur lancement.

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