How to choose the right rotary drill bit

Release time:

2018-03-20

Source:

All the staff who have had mechanical work experience are deeply serious about the wear and tear of machinery. The selection of key parts of machinery directly determines the service life of mechanical equipment. In this regard, small rotary drilling rig manufacturers will introduce how to choose drill bits for rotary drilling rigs. 1. According to the geological conditions, the main function of the drill bit rotary excavator is to form holes on the surface. The working object is rock. Due to the shallow depth of the pile holes under construction, the structure, granularity, porosity, cementation, occurrence and compressive strength of the rock have undergone complex changes due to tectonic movement and natural mechanical and chemical effects. In addition, China has a vast territory.

1. Drill bit shall be selected according to geological conditions

The main function of the rotary excavator is to form a hole groove on the surface, and the working object is rock. Due to the shallow depth of the pile hole, the structure, particle size, porosity, cementation condition, occurrence, compressive strength, etc. of the rock have undergone complex changes through tectonic movement and natural mechanical and chemical effects. In addition, China has a vast territory, so the working object of the rotary drilling rig is particularly complex. Summarize the following categories.

According to the lithology (common) for shale, sandstone, limestone, granite, etc.; according to the genesis of magmatic rock, sedimentary rock, metamorphic rock; according to the mechanical properties are divided into solid, plastic and loose. So how to choose the drill bit according to the formation situation? The following classification is introduced.

(1) Clay: rotary drilling bucket with single-layer bottom is selected. If the diameter is too small, two-petal bucket or drilling bucket with soil unloading plate can be used.

(2) For silt, weak clay layer, sand and pebble layer with poor cementation and small particle size, double-bottom drilling bucket can be used.

(3) Hard cement: rotary drilling bucket with single soil inlet (single and double bottom can be used) or bucket tooth straight screw is selected.

(4) Frozen soil layer: straight screw drilling bucket and rotary drilling bucket with bucket teeth with less ice content can be used, and tapered screw bits with large ice content can be used. It should be noted that screw bits are effective for soil layer (except silt), but they must be used in the absence of groundwater to avoid sticking caused by suction.

(5) cemented pebble and strongly weathered rock: it is required to be equipped with conical spiral drill bit and double-bottom rotary drilling bucket (single port for large particle size and double port for small particle size)

(6) Strobe bedrock: equipped with cutting-tooth barrel coring bit-conical spiral bit-double-bottom rotary drilling bucket, or cutting-tooth straight spiral bit-double-bottom rotary drilling bucket.

(7) Slightly weathered bedrock: equipped with cone barrel type coring bit-conical spiral bit-double bottom rotary drilling bucket if the diameter is too large, graded drilling process will be adopted.

Description of drill bit type of rotary drilling rig

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Description of drill bit type of rotary drilling rig

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