Patent ID: 7552890
Filing Date: 2009-06-30
Classification: B65H,E21B

Abstract:
1. A wheel tensioner assembly for applying tension to a string of coiled tubing during its injection into and withdrawal from a wellbore, the wheel tensioner assembly comprising: (a) a selectably rotatable tensioner wheel having a circumferential contact surface for interacting with a first side of the coiled tubing; (b) a holddown device comprising (c) a biasing mechanism for urging said contact rollers radially inwardly to bear against the second side of the coiled tubing and press the coiled tubing against the circumferential contact surface of the tensioner wheel, wherein the biasing mechanism includes a first tensioning cable in communication with the first end sheave of each roller mounting structure and a second tensioning cable in communication with the second end sheave of each roller mounting structure.