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