Some basic concepts of bearings
Some basic concepts of bearings
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Formation drillability of rocks and classification
by：Waxing
2020-09-16
Rock drillability is the basic factor of drilling efficiency, it reflects the drilling rock broken ease, is a rational selection methods, drilling bit structure, and on the basis of drilling program parameters.
For the strata of rock bit drillability is analyzed, can understand the rationality of bit type selection and ability to adapt to the formation.
General with the bit rate of penetration and the product of the footage as a measure of indicators.
Influence of rock drillability of rock basic attributes are: rock mineral composition and structure, density, porosity, property and water permeability;
Mechanical properties of hardness, strength, flexibility, brittleness, plasticity and abrasives, etc.
In general rock forming minerals quartz cementation, more strong, grain fine, dense structure, without weathering and alteration, the rock drillability is poor;
And the hardness and high strength of the rock, strong abrasive, poor drillability of rocks.
Technological factors that affect the rock drillability are: add on a bit of pressure, speed, type of mud and bottom clearance.
Technical conditions that affect the rock drillability are: drilling RIGS, drilling diameter and depth and drilling method, structure and quality of rock tools, etc.
Rock drillability classification point of view there are four, the dividing method also have four classes.
Due to the technology level unceasing enhancement, various rock drillability grade the relative and absolute relationship between also have change.
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