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What is the difference in the use of rotary bit in different geological environm

What is the difference in the use of rotary drilling bit in different geological environm

Rotating drill construction with low noise, high hole quality, many characteristics, high mechanization degree and the construction technique of practitioners is dig a bit, can meet the above requirements, according to select different bit of scientific and reasonable use of drill bit, also can perfect the construction technology of the rotating drill, expanding the area of the construction of the rotating drill.Different geological environments use different rotary bit, as follows:

Clay: single bottom rotary drill bucket, if the diameter is small can use two petal bucket or the drill bucket with unloading plate.

Silt, non-cohesive soil, sandy soil, and cobble layer with poor cementation and small size can be used with double bottom drill bucket.

Hard cement: single entry hole (single and double bottom can be used) rotary drill bucket, or bucket straight teeth screw.

Permafrost: straight drill bucket and rotary drill bucket with less ice content, and cone spiral drill bit with large ice content.In addition, the spiral drill bit can be used in the soil layer (except silt), but it should be used in the absence of groundwater, so as not to cause the suction effect and get stuck.

Cemented gravel and highly weathered rocks: tapered spiral drills and double-bottom rotary diggers (single for larger size and double for smaller size)

Apoplectic base rock: equipped with truncated barrel drill bit, conical screw drill bit, double bottom rotary drill bucket, or straight cut teeth spiral drill bit - double bottom rotary drill bucket.

Light - blown bedrock: equipped with a cone - type core bit.The tapered screw drill bit and double bottom rotary drill bucket should adopt the graded drilling technology if the diameter is too large.

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What is the difference in the use of rotary bit in different geological environm

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