Introduction to various drilling methods of rotary drilling rig

An excellent machine operator should always be clear about the geological type and strength of drilling at this time, and what kind of drill pipe drilling tool is applied, and what drilling method is the most effective, only in this way can we control the operation, reduce the load to the lowest, wear to the lowest, the fastest penetration.

Rotary drilling RIGS can be divided into four drilling methods according to geological conditions: cutting, crushing, flipping and grinding.

First, cutting type
Cutting drilling using bucket teeth, the use of double bottom dredging bucket with friction drill pipe, drilling relatively stable resistance of the formation, the general geological strength within 400 kpa such as mud, silt and sand layer, through the bucket teeth rotary cutting, can reduce the resistance to increase the speed of the drill.
Two, crushing type
Most of them use double-bottom rock drill buckets, and can be configured with friction or mechanical lock drill pipe according to geological strength, which can drill gravel, mudstone, sandstone, shale and medium weathering with strength of 500 kpa ~ 1000 kpa, and achieve crushing drilling by adding pressure to the alloy point on the pick.
Three, the dial type
Can use double bottom dredging sand and double bottom rock drilling bucket, can also be used with Bao E teeth, due to different types of geology, resulting in drilling methods change, such as pebble layer, because the pebble arrangement is irregular, can not be cut and broken, can be toggle drilling, with the main roll hanging the drill pipe, with the tip of the drill bucket teeth to move the pebble, the pebble loose in the floating drill bucket, This mode of operation is to avoid the strength and vibration of the pebble.
Four, grinding type
The use of rock drill and shaft drill, with the mechanical lock drill pipe drilling to calculate the single cycle compressive strength of the rock, strength from a few mpa to tens of mpa, usually the rock end bearing pile, through the barrel drilling ring grinding into the rock, or through the shaft drilling grinding drilling, and according to the type of rock, strength, brittleness and cracks do not rule out the possibility of crushing.