Figure 30: Simulation with choke closed
4.0 Conclusion
A drilling operation can only be successful if all tasks and activities
are performed in an efficient manner. This means that the well must
fully be under control at every time and this is only possible when
engineers understand the role pressure relationships play in the
wellbore and can detect when there is kick. Kick is the reason for the
need for well pressure control. The results gotten from the simulation
have shown us that the reservoir pressure is less than the well pressure
hence there would be an influx of reservoir fluids into the formation
meaning there is an overbalance. This is usually as a result of poor
well planning. Lost circulation, insufficient mud density and swabbing
or swabbing. In this case we are dealing with the use of invert emulsion
muds to manage pressure control or kick hence the mud density has to be
altered. This is because it does not exert enough hydrostatic pressure
to match the well pressure which due to the extended reach of the well,
it could be a problem of abnormally distributed pressure in the well.
The aim and objectives of this paper have now been met as the
rheological properties of Invert emulsion muds have been analysed and
their use for pressure control stated.