Compressive Strength Tri-cone Bit Guide Rock Compressive Strength: 0 to 5,000 psi / 0 to 35 MPa Bit IADC Code Recommendation: 111 to 112 115 to 215 117 to 217 Bit Description: A Steel Tooth Bit for Soft Formations. Ground Description: Very soft, unstratified, poorly compacted rocks such as poorly compacted clays and sandstones, marl limestones, salts, gypsum, and hard coals. Rock Compressive Strength: 3,000 to 6,000 psi / 20 to 40 MPa Bit IADC Code Recommendation: 221 to 311 225 to 315 227 to 317 Bit Description: A Steel Tooth Bit for Medium Formations. Ground Description: Medium-hard and abrasive rocks such as: sandstones with streaks of quartz, hard limestone or chert, crystalline dolomites, hematite ores, and hard shales. Rock Compressive Strength: 6,000 to 9,000 psi / 40 to 65 MPa Bit IADC Code Recommendation: 311 to 331 315 to 335 317 to 337 Bit Description: A Steel Tooth Bit for Hard Formations. Ground Description: Hard abrasive rocks such as: sandstones with quartz binder, hard sandstones, hard quartz shales, magma and metamorphic rocks. Rock Compressive Strength: 9,000 to 12,000 psi / 65 to 85 MPa Bit IADC Code Recommendation: 411 to 431 415 to 435 417 to 437 Bit Description: A TCI / Button Bit for Soft Formations. Ground Description: Long intervals of very soft poorly compacted shales, dolomites, sandstones, clays, salts and limestones. Rock Compressive Strength: 12,000 to 14,500 psi / 85 to 100 MPa Bit IADC Code Recommendation: 511 to 611 515 to 615 517 to 617 Bit Description: A TCI / Button Bit for Medium Formations. Ground Description: Medium hard and abrasive rocks such as sandstones with streaks of quartz, hard limestone or chert, hematite ores, hard, well-compacted abrasive rock such as: sandstones with quartz binder, dolomites, quartzite shales, magma and metamorphic coarse grained rocks

Compressive Strength Bit Guide

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Guide for determining and selecting the proper drill bit based on formation compressive strength

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Compressive Strength Tri-cone Bit Guide

Rock Compressive Strength:0 to 5,000 psi / 0 to 35 MPaBit IADC Code Recommendation:111 to 112115 to 215117 to 217Bit Description: A Steel Tooth Bit for Soft Formations.Ground Description: Very soft, unstratified, poorly compacted rocks such as poorly compacted clays and sandstones, marl limestones, salts, gypsum, and hard coals.

Rock Compressive Strength:3,000 to 6,000 psi / 20 to 40 MPaBit IADC Code Recommendation:221 to 311225 to 315227 to 317Bit Description: A Steel Tooth Bit for Medium Formations.Ground Description: Medium-hard and abrasive rocks such as: sandstones with streaks of quartz, hard limestone or chert, crystalline dolomites, hematite ores, and hard shales.

Rock Compressive Strength:6,000 to 9,000 psi / 40 to 65 MPaBit IADC Code Recommendation:311 to 331315 to 335317 to 337Bit Description: A Steel Tooth Bit for Hard Formations.Ground Description: Hard abrasive rocks such as: sandstones with quartz binder, hard sandstones, hard quartz shales, magma and metamorphic rocks.

Rock Compressive Strength:9,000 to 12,000 psi / 65 to 85 MPaBit IADC Code Recommendation:411 to 431415 to 435417 to 437Bit Description: A TCI / Button Bit for Soft Formations.Ground Description: Long intervals of very soft poorly compacted shales, dolomites, sandstones, clays, salts and limestones.

Rock Compressive Strength:12,000 to 14,500 psi / 85 to 100 MPaBit IADC Code Recommendation:511 to 611515 to 615517 to 617Bit Description: A TCI / Button Bit for Medium Formations.Ground Description: Medium hard and abrasive rocks such as sandstones with streaks of quartz, hard limestone or chert, hematite ores, hard, well-compacted abrasive rock such as: sandstones with quartz binder, dolomites, quartzite shales, magma and metamorphic coarse grained rocks