Use of Halliburton BHKA disconnect tool on P&A

Hi,

Drilling team is evaluating options to safely & efficiently abandon ~1500m of 8-1/2" open hole.

One option is to use sacrificial drillstring, which will be cemented in place and release using Halliburton BHKA tool in order to save rig time instead of placing multiple balanced plugs. In summary this is disconnect tool that would release sacrificial drillstring below and is activated by a dart similar to SSR dart.  Plan is to run ~1500m of 3-1/2" sacrificial drillpipe below, cement the sacrificial pipe in place and drop the dart with displacement fluid to release from the string once displacement is completed.

The Halliburton BHKA disconnect system is being considered and I would like to know if there has been any experience with this particular system or any other disconnect systems would be preferred.

Well has 30deg inclination at disconnect tool

String configuration will be as:

5-7/8" pipe

disconnect tool (BHKA)

3-1/2" NC38 sacrificial string of 1500m

Has anyone else ever used a disconnect system from sacrificial string for cement job ? How did that work? Any specific issues or lessons learned (such as not being able to disconnect, land the disconnect dart in time, etc.) ?

Regards,

Ruslan

16 Answer(s)

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