BOP jet sub with integral swab cups (to stop debris falling down the well)

22 October 2016 Dear colleagues

At a recent DWOP, we were discussing the fact that the BOPs (jack-up) would need to be jetted after an exit window has been milled with a cased-hole whipstock. It may be that the bonnets would need to be opened to check all the swarf (metal shavings) have been removed before the Drilling Co would function-test the rams. We would rather not do this.

I have a vague recollection that there is a 'smart tool' with integral swab cups (dressed for the casing size) that you can run. Whilst vigorously jetting the BOP, any swarf that falls into the well will be recovered by the swab cups.

Years ago, when a DSV at Shell, we made our 'own' tool with swab cups to catch a few cap-screws that we knew were either in the (subsea) BOP cavities or sitting on top of a hanger assembly. 

So, please let us know where we could get a 'proper' tools that would do this job.  = Vigorous jetting plus recovery of any debris (in one run). If you have been lucky enough to have run one of these, also any lessons learnt, please.
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Supplementary question: Whilst milling, ditch magnets will be in use.  Cleaning the swarf of these is time-consuming and carries HSE swarf (cuts due to the sharp swarf). It was suggested to use cloth 'socks'. However, there was concern that these might fall off and/or collect less metal.  What ideas/experience can you all share, please?

Thankyou

Dave

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