Patent ID: 6843320
Filing Date: 2005-01-18
Classification: E21B

Abstract:
1. A system for perforating a well, comprising: a perforating gun including one or more perforating charges for firing to perforate the well; a wireline for suspending the perforating gun in the well, the wireline including an inner sheath with an inner sheath strength and an outer sheath with an outer sheath strength differing from the inner sheath strength; a swivel for enabling rotation with the perforating gun with respect to a lower end of the wireline; and a rotational latching mechanism for rotating the perforating gun with the lower end of the wireline in one direction, while rotationally separating the gun from the lower end of the wireline in an opposing direction, such that tension in the wireline results in rotational torque to rotate the gun in the well, and the rotational latching mechanism separates the rotational torque from the gun in the opposing direction.