METHOD AND DEVICE FOR DRILL STRING RUNNING AND PULLING IN WELL

摘要

FIELD: oil and gas industry.SUBSTANCE: claimed group of inventions is related to method and device for round-trip well operations. The device for drill string running and pulling in a well comprises at least two pulling-and-running devices. Pulling-and-running devices are installed near opening at the drill site intended for string receipt. Notwithstanding one or several more pulling-and-running devices each pulling-and-running device is made to fix the string or the string section and to move the string or the string section in axial direction as well as to rotate the string section around its axis during axial movement. Each pulling-and-running device is equipped with pipe grab installed over opening at the drill site and made to move the string in axial direction. The pipe grab comprises a unit that ensures detachable connection with the string, prevents its rotation and a unit that is installed at or close to the string end and made to prevent rotation of the string section around its axis and to move the string section in axial direction. At that units of the pipe grab are made so that they may be removed from motion path of one or several running-and-pulling devices.EFFECT: invention ensures reduction of round-trip time and improvement of automatic control over these operations.5 cl, 2 dwg