Rock drillability basic factors determine the drilling efficiency, which reflects the degree of difficulty of the broken rock drilling, it is reasonable to select the drilling method, the drill bit structure and drilling the basis of the point of order parameters. Case of formation rock drill drillability analysis, to understand the rationality and bit selection adaptability formation. Usually to drill ROP and footage multiplied as measurable indicators.
Impact Drillability the basic properties of the rock: rock mineral composition and structure, density, porosity, water content and water permeability; mechanical properties such as hardness, strength, flexibility, brittle, plastic and abrasive. In general rock-forming minerals quartz and more firmly cemented, small particles, compact structure, without the weathering and alteration, Drillability poor; rock hardness and high strength, abrasive rock drillability difference.
Impact Drillability process factors: the pressure applied to the drill bit, speed, mud type and bottomhole BTA situation.
The technical conditions affect Drillability: drilling equipment, drilling diameter and depth, drilling method, the structure of the rock breaking tool and quality. Rock drillability classification point of view, there are four, there are four categories of its division method. Due to the continuous improvement of the level of technology, the rock at all levels can change in relative and absolute relationship between Diamond Level.
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