Ported vs. non-ported floats .. and dart subs

Hi folks,

There is an ongoing discussion amongst experienced personnel about the pros and cons of dart subs and ported vs. non-ported floats.

This Oil Co has a policy of using a ported float and a dart sub, in particular if drilling potential hydrocarbon bearing zones.

Years ago, the team that I was working in dispensed with dart subs; we concluded that they only added value if we would ever need to strip OUT of the hole, as it would serve as a Non-return valve.

However, I seem to remember that we used solid floats.

So, the usual gauntlet to you all :
1. What is your company policy ?
2. Have you ever run a ported float without a dart sub in potentially hydrocarbon-bearing zones ?
3. What else would you like to add into this potential debate.

Kind regards

Dave Taylor

18 Answer(s)

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