Molded foam plugs, plug systems and methods of using same

Details Molded foam plugs, plug systems and methods of using same Molded foam plugs, plug systems and methods of using same

E - Fixed Constructions

21

B

E21B 33/16 (2006.01)

Patent

CA 2545398

The present invention is directed to plugs, plug systems and methods for using the plugs and systems in subterranean wells. The plugs comprise an inner mandrel and an outer sleeve formed of a compressible foam. The plug systems include an assembly comprising a top plug and a bottom plug having foam outer sleeves. The plug systems further comprise a float valve into which the assembly fits. In the method, the bottom plug is deployed ahead of the top plug to separate a second fluid from a first fluid and wipe the inside of the pipe string clean of the first fluid. The top plug is used to wipe the inside of the pipe string clean of the second fluid and stop the displacement of the second fluid into the annulus between the casing string and the well bore.

L'invention concerne des bouchons, des systèmes de bouchons et des procédés d'utilisation des bouchons et systèmes de bouchons dans des puits souterrains. Les bouchons comprennent un mandrin interne et un manchon externe formé d'une mousse compressible. Les systèmes de bouchons comprennent un ensemble composé d'un bouchon supérieur et d'un bouchon inférieur munis de manchons externes en mousse. Les systèmes de bouchons comprennent en outre un flotteur à tube dans lequel vient s'emboîter l'ensemble. Selon le procédé de l'invention, le bouchon inférieur est déployé en avant du bouchon supérieur afin de séparer un second fluide d'un premier fluide, et d'essuyer l'intérieur du train de tiges et le nettoyer du premier fluide. Le bouchon supérieur sert à essuyer l'intérieur du train de tiges pour le nettoyer du second fluide et arrêter le déplacement du second fluide dans l'espace annulaire entre la colonne de tubage et le puits de forage.

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