Application: Suitable for very soft formation with low compressive strength and high drillability, such as clay, mudstone, gypsum and soft limestone, etc.

Application: Suitable for soft formation with low compressive strength and high drillability, such as mudstone, gypsum, salt and soft limestone, etc.

Application: Suitable for soft to medium formations with low compressive strength, such as medium soft shale, medium soft limestone, medium formation with harder and abrasive interbeds, etc.

Application: Suitable for medium hard ofrmation with high compress strength, such as hard shale, limestone, sandstone, dolomite, etc.

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