METHOD OF PLANNING AND/OR PERFORMING AN OFFSHORE WELL OPERATION

摘要

The invention provides a method of predicting the effect of heave on an offshore well operation performed from a floating offshore structure in a subsea well. The method includes providing heave motion data for the floating offshore structure, and running a well operation simulation model. A wellbore pressure is calculated using the well operation simulation model and the heave motion data to calculate the effect of heave motion on the well operation. The calculated wellbore pressure is compared with at least one pressure margin for the subsea well to determine a risk associated with the well operation. The invention may be used to assess a risk associated with deactivating a heave compensation system during a particular phase of the operation. Preferred embodiments of the invention use updated or real-time wave or weather data to calculate the effects of heave motion on wellbore pressure.