METHOD FOR MONITORING DRILL ROD OF MECHANICAL LOCK DRILLING RIG AND CONTROLLER, MONITORING SYSTEM AND DRILLING RIG

摘要

Disclosed is a method for monitoring the drilling rod of a mechanical lock drilling rig. The drilling rig comprises a multiple-segment drilling rod, wherein the segments on the drilling rod are respectively the 1st drilling rod segment to the Nth drilling rod segment from the outside to the inside. M locking points are provided on each drilling rod segment, and with the 1st drilling rod segment as the reference rod, the maximum extension length of the ith drilling rod segment is Li, wherein i=2, 3,..., N; the distance of the jth locking point from the top of the drilling rod segment is Jj, wherein j=1,..., M; the drilling rod segment being operated and measured is the ith segment; measuring the actual extension length of the ith drilling rod as li, based on li=Li-Jj, and determining that the ith drilling rod segment has been moved to the jth locking point. Further disclosed is a controller and apparatus for monitoring the drilling rod of a mechanical lock drilling rig, and a drilling rig comprising the apparatus. By monitoring the locking point to which the drilling rod has been currently moved, the method prompts the operator to perform locking or unlocking actions in a timely manner based on requirements, thus improving operational efficiency and aiding in eliminating the problem of rods not being unlocked.