Rotary drilling rigs can be divided into four drilling Types according to the geological conditions: cutting, crushing, toggling and grinding.
Cutting drilling using bucket teeth, the use of double bottom sand bucket with friction drill pipe, drilling more 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 improve the speed of the drill.
Most of them use double bottom rock drill bucket. According to the geological strength, friction or mechanical lock drill pipe can be configured. It can drill the grit, mudstone, sandstone, shale and medium weathering with the strength of 500 kpa ~ 1000 kpa.
It can be used with double-bottom sand and double-bottom drilling buckets, and can also be used with Bauer teeth. Due to the different types of geology, the drilling method changes accordingly. For example, when the pebble layer is irregularly arranged, it cannot be cut and broken. Plucking the pebbles, loosening the pebbles, and putting drilling under the floating. This operation method is to avoid the strength and vibration of pebbles.
The rock layer calculated by the single cycle compressive strength is drilled from several mpa to tens of mpa with the mechanical lock drill pipe. Usually, the rock bearing pile is entered into the rock by cutting and grinding through the barrel drill ring or grinding through the tooth shaft drill. At the same time, the possibility of breakage is not ruled out according to the type of rock layer, strength, brittleness and cracks.
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Post time: Dec-02-2022