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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Drillstring"”.
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Drillstring axial vibration and wave propagation in boreholes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1991.
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Hybrid Modelling and Optimisation of Oil Well Drillstrings
The failure of oil well drillstrings due to torsional and longitudinal stresses caused by stick-slip phenomena during the drilling operation causes great expense to industry. Due to the complicated and harsh drilling environment, modelling of the drillstring becomes an essential requirement in …
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Downhole Weight on Bit Prediction with Analytical Model and Finite Element Method
… incorrect because wellbore friction along the drillstring is not considered. Drillstring force modeling computer simulation can be utilized to economically determine the actual WOB value. In this thesis, two drillstring force models are programmed and compared: an analytical model and a finite …
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Extending the reach of drilling: better wellbore trajectory and torque & drag models
… drilling system. These risks include stuck pipe, drillstring wear, and fatigue. This objective will be achieved by [1] calculating accurate measurements of borehole positions [true vertical depth, northing and easting], [2] calculating truer measures of wellbore tortuosity and geometric torsion …
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Influence of Bit Design on the Stability of the Rotary Drilling System
… can depict the mechanism of the stick-slip drillstring vibrations. The complex arrangement of cutters of a realistic PDC bit, however, are responsible not only for multiple delays but also for a delay distribution that depends on the bit motion history. Since the delay distribution controls …
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Exploring wellbore and reservoir temperature profiles in fluid circulation and production operations
… from the Kinetic rotational energy of the drillstring in drilling operations. The thermal radius and the heat transfer behavior was also investigated for drilling, circulation, and production operations. Finally, a full derivation of the line-source solution of the temperature diffusivity …