Operation precautions.
1. After the pilot hole is drilled, telephones should be installed at the upper and lower levels to facilitate timely contact during drill replacement and reaming.
2. Steps for changing the drill bit:
(1) Use special tools to remove the tri-cone bit and joint.
(2) Use a special tool to transport the Drill pipe to the pre-installed position, level and level up, align the center of the reaming bit mandrel with the center of the threaded drill rod, and apply thread grease on the butt joint thread.
(3) Instruct the driver to rotate the threaded drill rod slowly and lower it slowly, so that the threaded drill rod and the reamer mandrel are screwed together.
3. Matters needing attention:
(1) The driver must follow the instructions of the lower-level staff. After receiving the action instructions of the lower-level staff, he must repeat it again and verify that it is correct before starting the rig.
(2) When starting the drilling rig, you must first contact the lower level staff before you can operate it. Do not start the drilling rig at will.
(3) Designate a dedicated person for safety monitoring. When abnormal conditions occur (such as excessive gas concentration, falling of the lower horizontal roof, etc.), work must be stopped, and if necessary, leave the scene and report to the relevant leaders, and then proceed with the operation.