What is gun jump?
Gun jump can occur through a couple of processes. It is mainly created when a well is perforated dry at or near the bottom of a well. It is here that the escaping perforating gun gasses act upon the bottom surface of the carrier and force it upwards. When this happens it usually creates a birds nest in the wireline due to a lack of tension in the cable. This can result in damage to the line. A second occurrence of gun jump can happen as a consequence of formation surge. In this case a strong rush of gas flowing from the formation as a result of the perforating helps push the carrier upward and damage the line. Tools known as perforating gun brakes have been developed to help combat these negative effects.
