| 摘要 |
A gripper mechanism ( 22 ) suspended in a coiled tubing/wireline in a well serves to releasably hold a downhole tool or other piece of equipment positioned downstream, via a tubular connecting element ( 10 ). The gripper mechanism ( 12 ) comprises axially, two relative to each other, movable coaxial parts ( 18, 16 ), a gripping part ( 18 ) designed to grip said connecting element ( 10 ) and an actuating part ( 16 ) designed to exert a radial clamping effect on the gripping portion ( 18 a) of the gripping part ( 18 ) when this is in engagement with said connecting element ( 10 ). The clamping effect is due to complimentary conical face on opposite sides of the two parts ( 16, 18 ) of the gripper mechanism ( 12 ) being forced against each other by the axial displacement of one part ( 16 ) relative to the other part ( 18 ) in one direction (the upstream/pull-up direction). In order to enable a small cone/coning angle to be used at these complimentary conical faces, while at the same time ensuring that the conical faces do not get wedged to each other across a longitudinal course in the axial direction, the conical faces of each part ( 18 and 16 ) have been divided, so that each conical face comprises annular conical part faces ( 32, 28 ) and intermediate annular cylindrical part faces ( 34, 30 ). The conical part faces ( 32, 28 ) have a mutually equal amount of taper and the same axial extent. The intermediate cylindrical part faces ( 34, 30 ) have a mutually equal axial extent. |
