2016 Fiscal Year Final Research Report
Numerical procedure for Stick-Slip of the drill-pipe
| Project/Area Number |
26630457
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kobe University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 海底科学掘削 / ドリルパイプ / Stick-Slip / 中立型遅延微分方程式 |
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| Outline of Final Research Achievements |
The present study investigated a numerical method to analyze the stick-slip of drill pipe by solving the NDDE (Neutral Delay Differential Equation) which is derived from torsional vibration equation. A small-scale model experiment was conducted in a water tank to observe the stick-slip phenomenon, and the result from the analytical model is evaluated with that obtained from the experiments. Additionally, the numerical model is applied for the actual drill pipe in operation. The solutions of the NDDE is depend on the initial history of the solution and some model parameters concerned with the frictional torque on drill bit. The present study investigated the effects of the initial history and the model parameters settings on numerical solutions in detail and presented an procedure to determine the appropriate settings of the initial history and the model parameters by reference to the measured top drive torque.
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| Free Research Field |
船舶海洋工学
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