A cutting device and a method for emergency cutting of a line in a well

摘要

A cutting device (2) and a method for emergency cutting of a line (12) in a well. The cutting device (2) comprises: - a tapering guide (18) including a narrow end portion (20) and a wide end portion (22) for feed-through of the line (12), the narrow end portion (20) being placed, when in its position of use, at a lower position than that of the wide end portion (22); - at least one sliding block (30, 32) arranged axially movable within the tapering guide (18); - at least one cutting knife (38, 40) connected to the sliding block (30, 32) and directed inwards in the tapering guide (18); - at least one releasable holding mechanism for standby holding of the at least one sliding block (30, 32) at the wide end portion (22) of the guide (18), and for releasing the at least one sliding block (30, 32) in connection with emergency cutting of the line (12). Upon release, the at least one sliding block (30, 32) will move downward in the direction of the narrow end portion (20) of the guide (18) where it will force its at least one cutting knife (38, 40) with increasing force against the line (12) until it is cut off.