The KG of the DEEP DRILLER increases from 57 feet to 59 feet while drilling at a 60 foot draft during an ice storm. What action should be taken?
β’ KG and stability relationship (higher KG = lower stability) β’ How removing high weight vs. shifting ballast affects KG β’ Use of the stability booklet/allowable KG curve at a given draft
β’ Which options will actually lower KG at the same or safer draft, and which will raise KG even more? β’ In an ice storm, where is the added weight located, and how does that location affect KG and stability? β’ If you are already above the allowable KG, is it acceptable to keep operating while waiting for conditions to change on their own?
β’ Identify which choice directly reduces high vertical weight contributing to the higher KG β’ Check whether deballasting (pumping out low weight) raises or lowers KG at this draft β’ Confirm which actions are required when the rig is outside the allowable KG envelope per its stability manual, before considering notifications to authorities
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