An automatic control mechanism to prevent the pipe string of a suspended pipe-laying robot from touching the drilling rig.

Abstract

This invention relates to an automatic control mechanism to prevent the tubing string of a suspended tubing manipulator from contacting the drilling rig, belonging to the technical field of tubing string placement for second-level drilling rigs in oil and gas drilling and production equipment. The invention comprises a sensor, a buffer seat, a T-shaped mandrel, a telescopic sleeve, and a compression spring. When the tubing manipulator lowers the suspended tubing string, the weight of the clamps and the tubing support is borne by the compression spring. When the lower end of the suspended tubing string contacts the drilling rig surface, the downward self-weight of the clamps and the tubing support is eliminated, the compression force of the spring is released, and it recovers under its own rebound force, causing the sensor on the T-shaped mandrel and the clamps to move upward together. The sensor triggers a contact signal to stop the tubing manipulator from continuing to lower the tubing string. This invention prevents the clamps from moving downwards when the lower end of the tubing string contacts the drilling rig surface and exerts no counter-impact force on the tubing string, completely solving the problems of tubing bending or breaking during lowering, and damage to the clamps and tubing string due to impact with the drilling rig surface.

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