The use of SBM (synthetic based mud) in the next drillhole should alleviate the problems they were having with the breakdown of the wellbore as the clays won't react with the mud. Also with functioning tools the drillhole won't be open too long which also contributed to the breakdown of the wellbore.
Refer to one of kiwi's earlier post for more info on SBM https://hotcopper.com.au/posts/65586384/single
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