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What are the drilling methods of rotary drilling rigs?
2022/08/26
A good operator should always know the type and intensity of geology to be drilled at this time, which rotary drilling rig drill pipes and tools, and which drilling methods are effective. Only then can the operation be controlled. Loads are reduced to low, wear is low, and footage is fast.
According to geological conditions, rotary drilling rigs can be divided into four drilling methods: cutting, crushing, plucking and grinding.
1. Cutting rotary drilling rig
The cutting rotary drilling rig adopts bucket teeth, double bottom sand bucket and friction drill pipe for drilling, and through the bucket teeth, it drills into relatively stable and low resistance formations, and the general geological strength is within 400 kPa, such as mud, silt, and sand. Drilling speed.
2. Crushing rotary drilling rig
Crushing drilling uses pickaxe drills, most of which use double bottom rock drilling buckets. Depending on the geological strength, it can be equipped with friction or mechanical locking of the drill pipe. It can drill gravel, mudstone, sandstone, shale, and moderate weathering, etc., by transferring pressure to the alloy points on the pick to achieve fracture drilling.
3. Toggle rotary drilling rig
It can be used with double bottom dredgers and double bottom rock drilling buckets and also with ball teeth. Depending on the type of geology, drilling methods will also change accordingly. For example, when the cobblestones are irregularly arranged and cannot be cut and broken, you can drill holes with the toggle, hang the drill pipe with the main roller, move the pebbles with the bucket, loosen the pebbles and place the bucket under the float. This method of operation is to avoid the strength and vibration of cobblestones.
4. Milling rotary drilling rig
Use rock drills and pivot drills with mechanical locking rods to drill into rock formations calculated from one-week compressive strength. The strength ranges from a few MPa to tens of MPa and is usually end-bearing piles into the rock. Mill annular cuts into rock, or drill holes with a spindle. At the same time, depending on the type, strength, brittleness and fractures of the rock formation, the possibility of fracture is not excluded.
2022/08/26
2022/08/26
2022/08/26
2022/08/26
