Abstract:
Determining the magnitude of an influx into the wellbore when a kick event occurs is very important
during well design as well as the well execution phases. This research is conducted to determine the kick
tolerance where the single bubble phase model is applied and also to compare it with the dynamic mul tiphase model. The information on the well and the parameters used are taken from the high pressure
and high temperature well drilled in Malaysia. Dynamic multiphase modelling is capable of supporting
more kick volume compared to single bubble gas phase modelling where it considers multiple fluid phase
in an influx and applies the gas characteristic to have a multiphase pressure loss. Dynamic multiphase
gives more kick tolerance to fracture the weakest point at the casing shoe where single bubble gas phase
is more conservative when it allows influx. The effect of pore pressure, mud weight, mud type, oil com position in mud, as well as the circulation kill rate are explored in dynamic multiphase. Increasing the
mud weight in either case reduces the maximum allowable kick volume of an influx due to the reduction
in MAASP between fracture pressure and hydrostatic pressure at the casing shoe. Higher kick volume can
be achieved using WBM compared to SBM. In addition, a sensitivity analysis is performed from the
dynamic multiphase simulations to analyze the impact on the kick tolerance during the increase in
mud weight as well as the pore pressure uncertainties. Moreover, the impact of kick tolerance has been
investigated when different types of mud are used, such as water-based mud and synthetic-based mud.
Based on the accuracy of the presented procedure, the prediction of kick tolerance from dynamic multiphase modelling can be used as a guideline to identify the behavior of an influx when a kick event occurs.