Use of OBM for drilling of 8.5" laterals, approx. 10000 ft length from Offshore Jackup rigs_Risk involved

Dear All,

For the Jackup wells of approx. 22,000 ft MD (10,000 ft lateral length) (2D profile wells|) we are using Water based non damaging mud for many years and we didn't face much of issues in running the 6-5/8" lower completions to well TD, however on recent wells we are facing problems running liner to well TD due increased complexities of profile like 3D profile, High DLS etc. Liner got stuck or held up earlier on some occasions and spent a lot of time to recover stuck liner with unsuccessful attempts. Which is why it is directing us to use OBM instead of WBM to lower down friction factors and help us to successful liner runs.

High risks are involved  in case the losses are encountered while 8.5" hole drilling in supplying OBM continuously to jack up rig. Especially in bad weather and no boats are working, it would led to disaster in case of well control issues.  

I wish to know, worldwide how is the practice for jack up rigs in using OBM for laterals drilling. What are the risks involved ? What mitigations plans should be in place ?

Your responses are highly appreciated.

2 Answer(s)

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