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Drilling ahead through an uncemented shoe
07 October 2016

I’m looking for thoughts or actual experience of running an uncemented 7.00” liner within an 8½” hole and using open hole packers and or anchors for isolation and stabilisation of the liner and shoe. 

Then continue drilling ahead 6.00” out of the uncemented shoe of the 7.00" liner to continue drilling the next section. 

Has anyone done this and if you did could you share your experiences and lessons learned?




10 answer(s)
KenHorne1
Multilateral Specialist
Multilateral Solutions
Total Posts: 31
Join Date: 30/09/13

Hi Scott.

As this liner would have to pass over a multilateral deflector and through a casing window I’m thinking an open-ended shoe would not be the number one choice.  It's unknown at this stage if we would need to work our way to TD but having that option is always a good thing.

Thanks for your suggestion to talk with TopCo.

Regards

Ken........




Scott_McNeil
Consultant
SPREADAssociates
Total Posts: 98
Join Date: 05/03/08
Hi Ken,

Have you considered using only a plain or scalloped guide shoe - i.e. has no internals? Might not be practicable considering you need the Liner for OH stability - do you anticipate having to ream the liner to bottom?

Otherwise I'd suggest talking with someone like TopCo in Canada, who I've found to be very responsive to unusual float equipment needs in the past.

Best Regards

Scott
Jtrantham
Senior Advisor for Game Change
Maersk Drilling
Total Posts: 2
Join Date: 07/10/16
Thanks for the further explanation in response #5.  It brings to mind a lot of redrills we used to do in Prudhoe Bay.  One of the techniques was similar to your scenario where a liner was placed outside of the window which left about 5' of open hole between the window and the top of the liner.  The liner had packers on each end and the shoe was drilled out.  There should be SPE papers on their learnings.  Again, best regards.
KenHorne1
Multilateral Specialist
Multilateral Solutions
Total Posts: 31
Join Date: 30/09/13

Thanks for the feed back again Sandeep.  Claudio, thanks for the link, I will look into this further.

Thank

Ken......




claudiovirgilio
Drilling Engineer
Well Engineering Partners
Total Posts: 6
Join Date: 14/07/15
Ken,
Enhanced Casing Installation (ECI) can help you with the system you need. The shoe / reamer shoe assembly can be retrieved by drill pipe or pump down cable depending on well conditions.
More info here:
http://wellengineering.nl/news/enhanced-casing-installation-eci/

Cheers
Claudio
sandeepdhawan
Principal Well Engineer
WellPerform Aps
Total Posts: 5
Join Date: 17/05/13
Ken, Yes OH packers be a solution for cement less liner run.

Further as said, the liner in a lateral will be in compression due to hydro static hence susceptible to buckling. Therefore consider lateral support, centralisation and standoff req. to determine number of OH packers.

If the liner is to be run to TD, pl. consider HAL solution on non-drill able float shoe/collar for cement less runs.

Hope this helps. Best Regards






KenHorne1
Multilateral Specialist
Multilateral Solutions
Total Posts: 31
Join Date: 30/09/13

Thank you very much for all of your thoughts, comments and suggestions.

This is a multilateral well I’m working on and as such the liner (not casing) in the lateral is not required for isolation but for bore hole stability and TAML L-3 junction connectivity which is already in the reservoir. 

On previous wells we did cement the 7.00” lateral liner shoe (only for stabilisation to drill out) but we are now constructing the junction 1500m md horizontally further out than previously and are looking for alternatives as getting the cement placement wrong, could mean cementing up the junction and potentially the motherbore.  That’s where perhaps as you suggest Sandeep, an alternative to cement could be an open hole packer.

Rather than run a conventional drillable liner shoe, is there perhaps a removable or recoverable shoe (guide shoe) on the market that would guide the liner over a whipstock and out into the open hole to TD and then rather than drilling out a conventional shoe perhaps recover it?




Jtrantham
Senior Advisor for Game Change
Maersk Drilling
Total Posts: 2
Join Date: 07/10/16

good comments above, especially the one on well control.  a full risk assessment will give you an idea on where everything lies.  The probability of the scenario is where your data will be limited.  Technically, you can do the process.  Test the inside of the casing first with a drillable bridge plug. Be careful on backing off the shoe joints and/or the shoe.  Expect loss of returns and possible squeeze work.  You know the drill.

I have drilled out in these scenarios but only a few times and just remember it being slower that anticipated, increased the well cost considerably, delivered a suboptimal product to the client, and once moved off the rig and used CTD.

Good luck

sandeepdhawan
Principal Well Engineer
WellPerform Aps
Total Posts: 5
Join Date: 17/05/13
Hi Ken,

Reference un-cemented liner run, I suggest talking to Welltec for WAB solution.

The metal seals perhaps provide requisite isolation and stabilization.

Also consider all aspects of fixity, buckling etc. to determine no. of WAB's.

Best Regards,

Sandeep 
Augusto
Consultant [retired Shell staff]
SPREADAssociates
Total Posts: 226
Join Date: 02/09/05
From my "Perpetual Diary" I quote:

QUOTE 1997 Week 20 UK                 9 5/8” casing run; catastrophic failure of the cement plugs and/or float equipment led to all the cement remaining inside the casing; none being placed around the casing. The cement inside the casing was drilled out but circulation around the casing was not possible.        A formation limit test indicated that drilling ahead to the next section TD was possible even though the casing would remain uncemented.          UNQUOTE

I believe the drilling out should be done with more weight on bit than rotation, at least until the Bottom Hole Assembly exited the casing. Non Rotating string stabilisers will help.

Fail to see the rational for such an approach. Blowout prevention and well killing procedures are a challenge as we never now the working pressure of the pressure vessel. Normally the pressure vessel working pressure is established by the test of the casing shoe, inexistent in this case.



Posted by

Ken Horne

Multilateral Specialist

Multilateral Solutions

Total Posts: 31
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