Slotting geometry for metal pipe and method of use of the same

E - Fixed Constructions – 21 – B

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E21B 43/08 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2357883

A slotting geometry for a metal pipe for use in fabricating slotted liners. The slotting geometry includes one or more integral substantially continuous unslotted helical coils extending around a peripheral sidewall for substantially the entire length of a tubular body. There are helical regions between the coils containing slots arranged to create generally trapezoidally shaped elongated struts joining the edges of adjacent coils. Ends of the tubular body have unslotted connecting portions, thereby facilitating connection with the tubular body. Slotted liners fabricated using this slotting geometry have the capability of having their outer diameter expanded or contracted. This has utility when inserting or removing the slotted liners into a well bore. By expanding or contracting the outer diameter, the slots can be made to be wider or narrower, this has utility in controlling slot width.

La présente concerne une géométrie de fentes pour un tuyau de métal utilisé dans la fabrication de chemisages à fentes. La géométrie des fentes comprend une ou plusieurs bobines hélicoïdales intégrales sans fente et essentiellement continues et s'étendant autour d'une paroi périphérique sur essentiellement toute la longueur d'un corps tubulaire. Les régions hélicoïdales entre les bobines contiennent des fentes disposées pour créer des plaques allongées généralement trapézoïdales rejoignant les bords des bobines adjacentes. Les extrémités du corps tubulaire ont des parties de raccordement sans fente, ce qui facilite la connexion avec le corps tubulaire. Avec cette géométrie de fentes, les chemisages avec fentes peuvent avoir un diamètre extérieur dilaté ou contracté. Cela est utile pour insérer ou retirer les chemisages avec fentes dans un puits de forage. Par dilatation ou contraction du diamètre extérieur, les fentes peuvent être rendues plus larges ou plus étroites, ce qui est utile pour contrôler la largeur des fentes.

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