Bit Run and Retrievable Wear Bushing

09 August 2011 Hi folks

At a Deepwater DWOP that I facilitated last week in SE Asia, one of the topics discussed was the Bit Run and Retrievable Wear Bushing from GE Vetco.

This allows the wear-bushing to be run with a tool that´s incorporated in the BHA. The bit and part of the BHA are run through the wellhead, past the unprotected seal area (for subsequent pack-offs) until the wear-bushing lands in the wellhead. The tool releases and continues in hole with the assy.

During the trip out the process is reversed. This saves a trip at section TD and also allows regular inspection of the wear-bushing and any remedial action required.

Concerns were raised about the potential for damage to the seal area whilst the bit/assy is run through it.

We are interested to hear member´s experience , especially :

1. Has any damage been encountered and, if so, how bad ?
2. What precautions you´ve been taking e.g. restrictions on allowable heave, maximum allowable wellhead inclination, bit design, use of BOP (annular) to centralise the string as the bit approaches the seal area.
3. Whether your rig has an Active or Passive Heave Compensator.

Kind regards

Dave Taylor
(MD - Relentless Pursuit of Perfection Ltd)

14 Answer(s)

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