Characteristics of drilling tools: Center cone guidance, cone drilling, rock fragmentation; The double headed spiral is subjected to uniform force and should not deviate from the hole; Double helix has strong slag carrying capacity, viscous formation, and single helix is easy to unload slag; Applicable strata: pebble layer, mudstone, sandstone layer, strongly and moderately weathered hard rock layer;
Characteristics of drilling tools: Straight spiral design, convenient for carrying slag; The double headed spiral is subjected to uniform force and should not deviate from the hole; Double helix has strong slag carrying capacity, viscous formation, and single helix is easy to unload slag; Applicable strata: clay layer, strongly weathered layer, gravel layer;
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