Rotary Drilling Rig Accident Handling

Accident treatment: every phenomenon and accident has its own factors, find these factors and eliminate it.

Slagging: Increase the viscosity of mud, liquid level height, reduce the sand content rate.

Hole collapse: Increase the viscosity of mud, liquid level height, increase the specific gravity of mud.

Bias hole: geology (strong weathering, medium weathering geology uneven force), operation (too fast pressure, too fast feed), drilling tools (not according to the geology of the selection of drilling tools, or drilling tools have defects, high resistance).

Shrinkage: lifting mud pressure, drilling tool (side cutter) operation reasons (feed too fast, pressurization too quickly, lifting start sucking air)

Slipping: operation (too much single bucket feed, too rapid pressurization), drill pipe (friction drill pipe, high geological strength, e.g. mudstone), drilling tools (not selected according to geological conditions or defective drilling tools), mud (lubrication), drilling teeth (not selected according to geological conditions or worn out drilling teeth)

Slurry leakage: slow l

eakage (mud wall problem), rapid leakage (geological problem: pebble layer), operational factors (rotating the drill bucket while lifting the drill up and down destroys the wall).

Water bubbling: low ground, water level under pressure.

Wire rope breakage treatment: drill pipe load-bearing power head, use the vice reel or crane, section by section from the outside to the inside to pour up the drill pipe.

Buried drill: modulate mud to clean up the sediment and wash the hole.

Stuck drill: Pressurize the drill pipe downward and use a long heavy object to impact the stuck drill bucket.

Pinch drill: Pressurize downward and use a long heavy object to impact the pinched drill bucket.

Bottom Plate Drop: 

1 Use auger to stir up.

2 Or use a large-diameter rock-entry auger after expanding the hole.

3 Remove the bottom plate of the double-bottomed drilling bucket, wrap the wire rope around the beam after reaming, and set the bottom plate into the drilling cylinder after slow drilling.

Drill pipe pin off: the drill bucket falls into the bottom of the hole, mud washing to clean up the slag, use a small diameter double-bottomed drill bucket, remove the bottom plate and weld the reversed double hooks, and salvage the bottom hooks.

Drill pipe core section broken: core section and drilling bucket hole, modulation of mud to clean up the sediment, use steel to make a skeleton.

(1) use steel wire rope to make a rope sleeve and fix the skeleton on the lower sleeve under the drill pipe spring seat.

(2) Get a crew to set the core joint.

END