Medium Formation Drill Bit Selection for Sandstone and Carbonates
Choose PDC, 437/447 tricone, Button/DTH, or limited drag structures for 4,000–15,000 psi sandstone, limestone, and dolomite.
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Hard Formation Drill Bit Selection for Granite, Basalt, and Quartzite
Select Button/DTH or IADC 637 tricone drill bits for 15,000–30,000 psi granite, basalt, and quartzite with gauge and cleaning controls.
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Abrasive Formation Drill Bit Selection Above 20 Percent Quartz
Select Button/DTH or strength-matched tricone bits when quartz exceeds 20%, separating abrasive wear risk from UCS and monitoring gauge loss.
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Interbedded Formation Drill Bit Strategy for Alternating Rock
Plan PDC, tricone, or Button/DTH drill-bit transitions for alternating Soft and Hard beds using lithology, torque, vibration, and gauge evidence.
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Consolidated Formation Drill Bit Selection for Cemented Rock
Select PDC, strength-matched tricone, or Button/DTH bits for well-cemented sedimentary rock using UCS, quartz, cleaning, and gauge evidence.
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Unconsolidated Formation Drill Bit Selection for Alluvium and Gravel
Choose drag or clast-matched tricone drill bits for uncemented alluvium and gravel while controlling packing, circulation, and bore stability.
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How to Choose a Bit for Unconsolidated Water-Well Ground
Choose drag or tricone drill bits for unconsolidated water-well ground while controlling packing, rolling gravel, RPM, and WOB.
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