Subsurface release cementing plug apparatus and methods

E - Fixed Constructions – 21 – B

Patent

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E21B 33/16 (2006.01)

Patent

CA 2219732

The present invention provides an improved subsurface release cementing plug apparatus for use in a string of pipe during the cementing of the pipe in a well bore. The apparatus comprises a hollow cementing plug seat member adapted to be connected in the string of pipe near the bottom thereof and a cementing plug assembly releasably connectable to a circulation tool or casing running tool in the top of the string of pipe. The cementing plug assembly is comprised of a top cementing plug having an external annular seating surface formed thereon for sealingly engaging a top internal annular seating surface of the cementing plug seat member, and a bottom cementing plug releasably connected to the top cementing plug having an external annular seating surface formed thereon for engaging a bottom internal annular seating surface of the cementing plug seat member.

La présente invention a trait à un dispositif amélioré de libération de bouchon de cimentation sous la surface utilisé dans un train de tubes pendant la cimentation du tube dans un puits de forage. Le dispositif comprend un élément creux de siège de bouchon conçu pour être relié au train de tubes près du fond et des bouchons de cimentation pouvant être reliés de façon à être libérés à un outil de circulation ou à un outil de pose du tubage au sommet du train de tubes. Le jeu de bouchons de cimentation est composé d'un bouchon supérieur de cimentation possédant une surface extérieure d'appui annulaire afin d'engager de manière étanche une surface intérieure supérieure d'appui annulaire de l'élément de siège du bouchon de cimentation, et un bouchon inférieur de cimentation relié, de manière à être libéré, au bouchon supérieur de cimentation possédant une surface d'appui extérieure annulaire afin d'engager la surface d'appui inférieure extérieure annulaire de l'élément de siège du bouchon de cimentation.

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