COILED TUBING FRICTION REDUCER

摘要

A tubing friction reducer (32) is mounted on a length of tubing within a bor e 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 outsi de diameter of an adjacent bore surface. A plurality of ball bearings (88) are positioned on and extending outwardly from the cylindrical body (34) extendi ng in a generally axial direction along the cylindrical body (34) for the purpo se 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 minimi ze injector force or prevent buckling and tubing failure due to wear.