Coiled tubing friction reducer

Details Coiled tubing friction reducer Coiled tubing friction reducer

E - Fixed Constructions

21

B

E21B 17/12 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2231651

A tubing friction reducer (32) is mounted on a length of tubing within a bore hole. The friction reducer (32) comprises a cylindrical body (34) having a first section and a second section hingedly secured (40) around an exterior surface of the coiled tubing (18), the cylindrical body (34) having an outside diameter of an adjacent bore surface. A plurality of ball bearings (88) are positioned on and extending outwardly from the cylindrical body (34) extending in a generally axial direction along the cylindrical body (34) for the purpose of reducing friction between the coiled tubing (18) and the bore surface generated upon contact between the coiled tubing (18) and the bore surface. Retaining mechanisms such as collapse springs (92) are included for securing the ball bearings (88) to the cylindrical body (34). The tubing friction reducers (32) are placed along the tubing (18) at intervals to either minimize injector force or prevent buckling and tubing failure due to wear.

La présente invention concerne un réducteur de friction (32) de tubage monté sur une longueur de tubage à l'intérieur d'un trou de forage. Le réducteur de friction (32) comporte un corps cylindrique (34) constitué d'une première et d'une seconde partie articulées (40) entre elles pour enserrer une face externe d'un tubage bobiné (18). Le diamètre externe du corps cylindrique (34) est égal au diamètre interne de la surface adjacente de forage. Le corps cylindrique (34) est pourvu superficiellement de plusieurs roulements à billes (88) en saillie répartis selon un sens général axial sur la longueur du corps cylindrique (34) de façon à réduire la friction engendrée entre le tubage bobiné (18) et la surface de forage par le contact entre le tubage bobiné (18) et la surface de forage. Des dispositifs de retenue tels que des ressorts à écrasement (92) permettent de retenir les roulements à billes (88) contre le corps cylindrique (34). Les réducteurs de friction (32) de tubage sont disposés sur la longueur du tubage (18) selon des intervalles permettant, soit de ramener à un minimum la force de l'injecteur, soit d'empêcher le flambage et la défaillance du tubage par usure.

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