DEVICE FOR UNCOUPLING A DRILL STRING, DRILLING SYSTEM COMPRISING SUCH A UNCOUPLING DEVICE, AND USE OF SUCH A SYSTEM

摘要

A device for uncoupling a drill string, the device including, in a longitudinal direction: a first structure that is intended to be attached to a drill string tube; a second structure that is intended to hold a cutting tool for drilling and is translatable relative to the first structure; and a thruster assembly between the first structure and the second structure. The thruster assembly is configured to exert a thrusting force on the second structure to separate the second structure from the first structure, the thrusting force being constant for every position of the second structure relative to the first structure.