Deepwater Course Material

• Title : Centrilift 9 Steps ESP Design
• Publish : www.spdltd.com, A member of the Petrofac Group
• Type Document : pdf 
• Release : N/A
• Total Page : 20 Chapter
• Size : 31.19 Mb

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Decrypted Contents

When drilling, it is vital that the actual pore pressure is predicted from the parameters observed.
Available kick tolerance should be constantly updated as the hole section progresses

• If kick tolerance is predicted to fall below the pre-defined acceptable value, consideration must be given to setting casing early 
• for wildcat exploration wells it is advisable to plan the well such that there is a contingency casing string available should this be required

Swabbing can induce an influx in a deepwater well due to

• small margins between pore pressure mud gradient and formation strength 
• high mud gel strength in the upper hole sections where mud temperature may be low 
• consider pumping out of the hole to reduce the risk of swabbing 
• Identify possible requirement to pump out in the drilling programme

When drilling into a potentially abnormally pressured formation in deepwater, it is good practice to make dummy connections or “pumps off tests”routinely

• gas levels at bottoms up must be monitored to check for increased levels of connection gas which could indicate that the hydrostatic static overbalance is close to pore pressure.

A very long riser system can mask gas peaks

• especially if the riser boost line is introducing a significant fraction of the total mud flow at the BOP
• masking effect of the riser is most apparent when drilling smallhole sizes at low flow rates 
• tracking of gas readings may be considerably more difficult in deepwater operations.

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