Abstract
Feeding system is the main mechanism of carrier mounted rig, and determines the rig’s performance. The feeding system contains stretching mast, which pulls the drive head through two hydraulic cylinders and steel cables, as a result, the rig has a compact structure and long feeding distance. The feeding system’s hydraulic system including two pumps and two control circuits is designed to meet the demand of fast round trip and pressure’s accurate control of drilling based on the analysis of drilling procedure and load performance. The two explosionproof valves on the head end of feeding cylinders guarantee the stable suspend and avoid percussion drilling after pipelines bursting and drilling tools dropping on account of maloperation. Furthermore, the two explosionproof valves make the pressure of the two head ends of feeding cylinders equal to ensure the two feeding cylinders to run in step through control ports in parallel. In the end, ZMK5530TZJ100 is developed and applied to construct a “L” horizontal directional well with a depth of 1675 m to verify the rationality and reliability of the rig’s feeding system.
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