A device of pulling and running tubing string for workover with unmanned wellhead operation

Based on the existing power and elevating conditions of workover rig, a kind of device of pulling and running tubing string with unmanned operation at wellhead is developed. It mainly includes automatic suspension system, hydraulic pincers automatically screwing system and remote hydraulic control system. Control commands of each part are concentrated on workover console. A driver remotely controls to catch or put, centralize, center, hang, screw, lock, pull or run tubing. A driver and a site worker can complete the work, which not only reduces the labor intensity, but also keeps the workers away from the harm of dangerous area at wellhead. The new device has great advantages with its simple design, small volume and stable performance, do not occupy the wellhead artificial operation space, do not affect the artificial well control emergency, do not interfere with the wellhead evacuation and do not increase the moving vehicles and operation cost. Its operation speed is controllable and as nearly as manual operation. It is popular with the oilfield workers.