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Correlation between the drill bit used lithology


The hardness of the rock refers to rock drill cutters resistance pushed. Rock composition and hardness of rock particles, the size and nature of the cement particles related. Compare levels are: Level 1 - talc; Level 2 - Gypsum; Level 3 - calcite; 4 - fluorite; Grade 5 - apatite; 6 - orthoclase; 7 - quartz; 8 - topaz; 9 level 2 - corundum; 10 - diamond. Series, the greater the hardness, the slower the rate of penetration.

    Plasticity and brittle rocks are two opposing concepts, objects in front of the destruction was the nature of the plastic deformation called plastic, plastic deformation properties of the object does not occur before failure called brittle. Large plastic objects not brittle or brittle small, on the contrary, brittle plastic or no plastic objects is very small. Rock, it can be divided into three categories, one is not plastically deformed brittle rocks, such as granite, quartz sandstone occur before failure; second category is the destruction of a large plastic before the plastic deformation of rock, such as shale; three before destruction is rendered less plastic deformation after crushing plastic brittle rocks such as shale cemented sandstone. Rock abrasive means on the rock surface in contact with the drill bit, rock and debris on the abrasive action of the drill bit. Rock drill wear ability called abrasive rock, and the rock itself composition, particle size and shape and so on. Abrasive rock larger drill wear more serious, less total drill footage. Per unit friction and wear away by the variety of rock abrasiveness is divided into 12 small to large. Level 1 - shale and carbonate rocks; Level 2 - limestone; Level 3 - dolomite; Level 4 - siliceous rocks; grade 5 - iron - magnesium containing 5% quartz rock and a low abrasive rock; 6 - lithofeldspathic; 7 - containing more than 15% of quartz and quartz-containing particles lithofeldspathic 10% less abrasive rock; 8 - quartz rocks; 9 - quartz rocks, hardness PY≥350Kg / mm2; 10 Level 2 - quartz rocks, hardness PY = 100 ~ 200Kg / mm2 and quartz particles containing 10 to 20% of the rock; 11 - quartz rocks, hardness PY = 200 ~ 250Kg / mm2 and containing quartz grains 30% of the rock; 12 - quartz rocks, hardness PY <100Kg / mm2. Salt rock, shale, and some sulfates, carbonates, etc. is free of abrasive quartz grains smallest rock; limestone, dolomite and other low abrasive rocks; igneous rock containing less feldspar and quartz, fine grain size, mineral the small difference in hardness between the abrasive small

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