Description

The mechanical release device is connected by a claw structure, and the claw is locked by a limit sleeve. When the perforation is completed, lower the shifter and other tools from the wellhead to the position below the release device, shake up the shift tool and cut the shear pins of the release device. Continue to vibrate to move the limit sleeve and release the claw, so as to release the perforating gun string below the joint under the mechanical release device. Continue to vibrate the shift tool upward, and the impact force will cut the steel shear pin on the shift tool, so that the shift tool is separated from the limit sleeve, and the shift tool can be pulled out.