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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 4 The optimization results of drilling parameters under different ranges of narrow safe pressure margins.
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Narrow safe
pressure margins/
(g?cm-3) | 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) | | 1.03-1.04 | 0.4 | 0.30 | 1 200 | 100 | 500 000 | 42 | 1 340 | | 1.03-1.05 | 0.4 | 0.34 | 1 250 | 100 | 500 000 | 36 | 1 510 | | 1.03-1.06 | 0.4 | 0.32 | 1 250 | 100 | 500 000 | 39 | 2 200 |
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