Introductions to the Various Drilling Methods of Rotary Drilling Rigs

Publication Date: 2023-03-13

A good mechanic should always be aware of the type and intensity of the geology being drilled at this time, and what kind of stem drilling tools to apply and what drilling method to use is the most effective, only then can he control the operation, reduce the load to the minimum, wear and tear to the minimum and the fastest progress.

Introductions to The Various Drilling Methods of Rotary Drilling Rigs

Rotary drilling rigs can be divided into four types of drilling according to the geological conditions: cutting, crushing, toggling and grinding .

I. Cutting type

Cutting drilling uses bucket teeth and a double-bottom sand bucket with a frictional drilling rod to drill into strata with low resistance, such as mud, chalk and sand layers with a general geological strength of 400 kPa or less.

II. Crushing type
Crushing drilling uses cut-off teeth to drill, mostly with double-bottom rock entry buckets, which can be equipped with friction or machine-locked drill rods according to the geological strength, and can drill sand and gravel, mudstone, sandstone, shale and medium weathering with a strength of 500 kPa to 1000 kPa.

III. Toggle type
For example, in the case of pebble layers, where the pebbles are irregularly arranged and cannot be cut and broken, toggle drilling is used, where the main roll is used to hang the drill pipe and the tip of the bucket teeth is used to toggle the pebbles, loosening the pebbles and then floating the bucket down, avoiding the strength and vibration of the pebbles.

IV. Milling type
The use of rock entry cartridge drills and tooth shaft drills with machine-locked rods to drill into rock formations calculated on the basis of a single circumferential compressive strength ranging from a few MPa to several tens of MPa, usually for rock entry end piles, by ring-cutting and grinding into the rock with cartridge drills, or by grinding with tooth shaft drills, while not excluding the possibility of crushing depending on the type of rock formation, its strength, brittleness and fractures.

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