Abstract
The effect of intermittent bit nozzle fluid flow on chip removal is examined in drilling operations. Theoretical equations for a nozzle that would provide intermittent flow have been developed. The proposed modified design equations were used to calculate the impact-pressure gradients under the bit. The calculated values of the impact pressure for both regular and modified nozzles show that the modified nozzle provides a decrease in the impacted area under bit-jet pressure while the impact-pressure gradient is increased, resulting in improvement in chip removal from under the bit.
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