How to maintain the drilling power slips

Maintenance and maintenance

1. Rinse with clean water or high pressure air after each use. Guide rod, piston rod root filling oil.

2. Before pulling out the quick joint, it must be washed clean. After pulling out the quick joint, the joint should be tied with clean plastic bags to prevent mud and other dirt from entering the joint and pipe.

3, check the ** ring regularly, when the wear * 3mm, should be replaced in time (recommended to replace every six months)

4. Check the wear of clamp teeth (slip teeth) regularly, and replace them in time when the wear is serious.

5. During relocation, the support plate shall be attached to the upper plane of the step slip seat, and the two slip seats shall be fixed with the connecting piece to prevent the falling phenomenon on the drilling floor.

(1) under the drill pipe or casing homework when wellhead is skewed, centered in front of the card tight string need to use the hydraulic cylinder position at the center of the string passed to the wellhead, namely in front of the lock button operation, driller operation console hydraulic center button first, after waiting for string is passed to the center again clamping cylinder, string by card again after reset button operation, This ensures that the hydraulic power slips can be reliably clamped into the oil pipe string.

(2) when the drill pipe or casing, tubing string and takeover column joints for buckles, driller open power slip power switch and control power slip hydraulic lifting cylinder (cylinder) release of the hydraulic control valve, the hydraulic cylinder bottom into the liquid, lift string at the same time, at this point, the hydraulic cylinder piston upward lifting force and the tubing string and slip teeth under the action of friction, The slip body goes up and opens out along the cone of the slip seat, releasing the string and allowing the passage of the string from the power slip center. At this point, the string can be pulled up and the drill pipe or casing can be lowered after all four slips are opened.

The lifting of the slip body is driven by the power cylinder to move the support plate up and down through the connecting rod. The slip body is driven down by the force of the power cylinder, the weight of the slip body and the friction between the pipe string and the slip teeth. The slip body relies on the power cylinder thrust and the friction between the pipe string and the teeth of the slip body. The action of the hydraulic lifting cylinder is controlled by the driller control valve. When the oil pipe string deviates from the wellhead center, the thrust of the hydraulic center cylinder is used to force the pipe string to center. Also, the driller controls the hydraulic control valve center or reset button on the operating table to push the pipe string to the center position of the wellhead and then operates the hydraulic lifting cylinder to clamp or loosen the pipe string.

The size of different hydraulic power slips can be changed according to the size of rotary table and drill pipe.