DP — Drillship / MODU Practice Questions

A. An LMRP disconnect occurs automatically whenever the DP system goes to joystick mode

B. The LMRP is only disconnected when drilling operations are completed for the well

C. An LMRP (Lower Marine Riser Package) disconnect is an emergency separation of the riser/BOP stack at the connector below the BOP, triggered when the vessel cannot hold position adequately to prevent riser overstress or when a drive-off/drift-off puts the riser beyond its angular tolerance — it disconnects the vessel from the wellhead before the riser is damaged or pulls the BOP off the wellhead

D. An LMRP disconnect is a planned daily procedure carried out to inspect the BOP

A. The colour zones represent thruster availability: green = all thrusters online, yellow = one thruster offline, red = two or more offline

B. Green = normal operating range (riser within safe angular limits); Yellow = advisory — riser angle approaching limits, increased monitoring required; Red = riser angle at or beyond limits — LMRP disconnect must be initiated; these limits are defined in the WSOG for the specific well and riser configuration

C. Red means the riser is fully vertical; green means it is at its maximum angle

D. The colours indicate weather severity, not riser angle

A. They are different names for the same document used in different regional markets

B. WSOGs are prepared by the classification society; ASOGs are prepared by the operator

C. An ASOG is the general DP activity operating guideline defining green/amber/red limits for the operation type; a WSOG is a well-specific supplement that incorporates well-specific parameters — riser angle limits, disconnect criteria, BOP type, water depth, and drill string tensions — that apply for a specific wellhead and vary from well to well even on the same vessel

D. The WSOG is the general document; the ASOG is the well-specific supplement