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Unformatted text preview: nd borehole pressure were applied. The borehole pressure was maintained constant over the range of flow rates used. Rotary speed was maintained at 60 rpm throughout the tests except where stated. The highest flow rates and corresponding hydraulic horsepower levels were established first and were decreased progressively to the lowest level during each test. The conditions at each level were then held constant as weight on bit was varied in 10,000 lbm increments from 20,000 to 40,000 lbm for all tests and at 50,000 lbm for a few data points. 11 Results The DSE concept was evaluated by applying Eq. 8 to the tabulated results presented in Tibbitts et al.’s publication. The relationship of DSE and ROP was investigated for the different drilling parameters (WOB, and HSI), as follows: SPE 116667 3 DSE vs. ROP, for different WOB: Fig. 2 shows DSE vs. ROP for all the experiments grouped according to the WOB. The four WOB curves follow a power function. A good agreement between the experimental d...
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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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