The water well drilling rig DTH hammer needs these strategies for complex formations (like alternating hard-soft layers, fractured zones):
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Parameter adjustment:
Lower impact and boost speed in soft rock;
raise them in hard rock.
Avoid uneven well diameters.
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Bit selection: Use “mixed pointed-flat teeth” bits for alternating layers. They meet both formation breaking needs.
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Wall protection: Adopt pipe-following drilling in fractured zones. The hammer drives casing forward to prevent collapse.
A mountain drilling project faced 5 alternating layers. These strategies helped the water well drilling rig finish an 80m well, keeping deviation under 1°.
