... as in this paper. Surge and swab in the region of ≈200 psi (≈15 bar) was reported during the drilling of a vertical well from a drillship in the Campos Basin ( Rommetveit et al. 2005 ). The pressure oscillations were measured 235 m above the bit. Information on the rig heave was not available in the paper...

... provides a mathematical model to predict dynamic axial loads imposed on a deepwater landing string by a drillship's response to ocean waves. The model can be adapted to a given landing string's geometric and mechanical constraints. The model will help the user identify the correct opportunity for pausing...

... resupply would be very difficult unless performed by air. Based on these geographical and ecological factors, Enterprise Oil decided to use a drillship. The vessel required for such a job needed to be capable of carrying all the equipment and materials for the well plus considerable contingency...