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Parameters optimization in deepwater dual-gradient drilling based on downhole separation
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WANG Jiangshuai,LI Jun,LIU Gonghui,HUANG Tao,YANG Hongwei
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Table 3 The optimization results under different range of drilling parameters.
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| n value | Optimization results of drilling parameters | Maximum
drilling
depth/m | Separation
efficiency | Injection volume fraction | Density of pure
drilling fluid/(kg?m-3) | Distance between separator and bit/m | Wellhead back pressure/Pa | Displacement/
(L?s-1) | | 5 | 0.4 | 0.30 | 1 150 | 100 | 1 000 000 | 30 | 1 440 | | 6 | 0.4 | 0.34 | 1 250 | 100 | 500 000 | 36 | 1 510 | | 7 | 0.4 | 0.38 | 1 300 | 100 | 500 000 | 42 | 1 550 |
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