3 that the bit hydraulic is the driver to move from

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Unformatted text preview: n region. It is revealed from Fig. 3 that the bit hydraulic is the driver to move from inefficient to efficient drilling when the WOB is constant. By increasing HSI not only are the cuttings removed faster underneath the bit, but also the bit cutting-structure is kept clean to break new rock more effectively. Fig.4 shows four data sets where the WOB is increased from 20,000 lb to 40,000 lb while the HSI is kept constant at 0.5, 2.9, 3.3 and 7.6 hp/in2, respectively. The experiments mimic what happens at the field when the WOB is increased in order to increase the ROP. One experiment is on the inefficient drilling region (0.5 hp/in2), another one is on the efficient drilling region (7.6 hp/in2), and the other two are on the transition region (2.9 hp/in2 and 3.3 hp/in2). ROP always increases when WOB is increased, on all the experiments. For HSI equal to 0.5 hp/in2 (inefficient region), DSE initially decreases when WOB is increased from 20,000 lbs to 30,000 lbs, but then DSE increases when WOB is further increased from 30,000...
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This note was uploaded on 01/31/2014 for the course MOGE 9114 taught by Professor Thomod during the Spring '13 term at Memorial University.

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