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Unformatted text preview: 40,000 lb).
DSE vs. MSE: Figs. 6, 7, and 8 show MSE vs. ROP for the same experimental set of data as shown for DSE. MSE was
calculated using Eq. 1, Eq. 4 and Eq. 6 and presented on Figs. 6, 7 and 8, respectively. The rock confined strength (CCS) is
also included on Figs 5 to 8 in order to compare DSE and MSE performance. The calculated specific energy should be close
to the CCS when the system is operating efficiently.1 DSE has a better correlation with the CCS than MSE. The MSE values
calculated with Eqs. 1 and 4 are higher than CCS (Figs. 6 and 7) suggesting that the system is always operating at inefficient
conditions. The CCS value fits in the middle of the MSE calculated with Eq. 4 (Fig. 8) suggesting that the system could
operate with MSE values up to 43% lower than the CCS value. This seems an unrealistic situation.
Bit Hydraulic Contribution to the Specific Energy Correlation: The ratio of the bit hydraulic-energy contribution as a
function of the mechanical-energy contribution was calculated using the following equation: ⎛ MSE − DSE ⎞
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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.
- Spring '13