Thesis Simulations

Nevertheless, it is important to test the experimental set-up with the proposed method first to be able to assess its efficiency.

The simulation results found that the model is extremely friction dominated, a very important conclusion in this case.

A detailed review of the historical, technical and operational aspects of the technology was performed.

Already existing commercial field applications confirms the future interest in CML.

After a comparison of the two schemes, the 2nd order showed more realistic and smoother results.

The simulations of the 1st order scheme confirmed the problem of negative velocity fields for static conditions.Special focus was placed on the numerical boundary treatment on top of the well.Several ways of defining the outlet pressure boundary were investigated.However, an alternative method was found by editing a specific pressure condition in the code, which was there initially to assure stability but in this set-up was causing a problem.Both methods were compared and the alternative method was concluded to be the best out of the two.This might cause problems in studying this particular simulation case as it mostly relies on pressure control based on manipulations of the hydrostatic pressure component.Furthermore, the results showed that the effect of these manipulations was almost entirely masked by friction.Two methods for achieving stable numerical solutions were found.Since the pressures delivered by the approximated small-scale model were very low, the first method involved pressurizing the system with 10 bars.Due to an increased demand from operator companies for deep-water drilling solutions, an interest in Dual Gradient technologies has risen.An example of such a technology is Controlled Mud Level (CML) drilling, where a subsea pump integrated in one of the riser joints actively controls the riser level.


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