Cuttings Change: Shape, Size, Amount, Type
Cuttings are rock fragments chipped, scraped or crushed away from a formation by the action of the bit. The size, shape and amount of cuttings depend largely on formation type, weight on the bit, bit dullness and the pressure differential (formation versus fluid hydrostatic pressures). The size of the cuttings usually decreases as the bit dulls during drilling if weight on bit, formation type and the pressure differential, remain constant. However, if the pressure differential changes (formation pressure increase),even a dull bit could cut more effectively, and the size, shape and amount of cuttings could increase.
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Famous quotes containing the words cuttings and/or type:
“Piles of scrapbooks, the cuttings turned by time to the colour of the freckles on an old lady’s hand. Her hand. My hand, as it is now. When you touch the old newsprint, it turns into brown dust, like the dust of bones.”
—Angela Carter (1940–1992)
“How is freedom measured, in individuals as in nations? By the resistance which has to be overcome, by the effort it costs to stay aloft. One would have to seek the highest type of free man where the greatest resistance is constantly being overcome: five steps from tyranny, near the threshold of the danger of servitude.”
—Friedrich Nietzsche (1844–1900)