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Coiled tubing bridge plug milling
06 July 2015

Forum members.

Some years ago, I was involved with a coiled tubing operation on an ERD well where we planned to drill out a drillable bridge plug within the liner.

All the CT simulations showed that we would have very little weight to drill the plug out. We therefore used a tool run above the CT motor that when the bridge plug was tagged the CT tool activated by flow, anchored its self to the tubing wall and had a stroking mechanism to apply constant weight on the bit and motor to successfully mill out the bridge plug.

The tool worked well but I have not seen it again since.

Does anyone know of this tool or something similar?

Also, is there a tool that can be run on coil that would tell you how much weight you had applied on the CT tools when down hole setting a wireline lock?  I'm not looking for real time read out perhaps just a tool that would shear or read or store in memory the weight on bit whilst working at depth in a horizontal well.



6 answer(s)
Multilateral Specialist
Multilateral Solutions
Total Posts: 36
Join Date: 30/09/13
Thanks Simon.  I will check with Jim Crab or Paul Day.


MSc Drilling and Well Engineering Student & SME owner
Robert Gordon University
Total Posts: 10
Join Date: 17/04/09
in 1998-ish I was working as a junior designer at PES (which was bought by Halliburton) and we made a CT swedging tool which consisted of a set of packer slips and two or three rams in series.  It was made to swedge open collapsed 5-1/2" tubing.  It was built and tested but I believe never run in anger.  This is not a direct solution to your problem but the principle is similar.  Dont know what Halliburton did with all those old project files though!
Multilateral Specialist
Multilateral Solutions
Total Posts: 36
Join Date: 30/09/13

Thanks for the feedback gents.  For sure, all of your comments and suggestions are very worthwhile considering thank you.  I'm compiling a list of options to review and in time make contact with the various vendors to discuss in detail.

I would however still be interested in finding a CT stroking type/pusher tool for milling out bridge plugs if one still exists to make a comparison with a CT or wireline tractor operations.

The operation I have in mind already plans to have coil in the well plan and so it would be good to use the coil rather than wire as this would necessitate a surface equipment change out and more POB.


Intervention Engineer
Society of Petroleum Engineers
Total Posts: 9
Join Date: 17/05/10
Check Antech there in the UK, they have the tools to provide the data you are looking for.  
As well Alastair nailed it, a tractor on CT would provide the loads you need for milling.

Global P&A Advisor
Total Posts: 6
Join Date: 12/03/12
The tool you are describing is something I have been looking for for some time. I am looking at using it for milling, eroding thru collapsed casing tubing to get access to the well for then to do a proper P&A.

So if someone out there knows of a anchor stroker tool to be run on CLT, give us a shout !

Project Manager
Myspread Users
Total Posts: 17
Join Date: 04/07/08
Baker's coiltrak system provides weight on bit measurements as well as VSS and PWD, but that is probably overkill for what you need.
Impact Guidance Systems also has(d??) a smartcoil system with downhole measurement suite.  I've used their memory WoB tool previously, but that was a couple of years ago and I can't find spec sheets anymore online, so may no longer be around?

There are stroker tools out there, but usually for setting/unsetting packers where force required is greater than available with CT. A better option would be a CT tractor that can apply constant force while milling and will help ensure you get to depth - look at Welltec or similar.

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