patience - the time is nigh!!!, page-43

FoC,

Correct - the water is coming up between the casing and drill stem.

This area is cemented when the casing is first run.

Technical on Cement.
They call it cement - but it must be a flowable grout.
These grouts can be resin based or cementitious (cement based)
My experience with them is that a flowable grout can cost from $15 per 15kg bag to $200 per 15kg bag.
The setting strength can range from 20mPA to 95mPA.
I know a lot about cementitous crouts - but only a little about resin based.

SO - from that I would assume that when running casing you would use a standard flowable grout. It would work 99% of the time.
Note- when they plugged above zone 1 /2 - they expected that the water would be contained.
BUT- it didn't this time - so they then re-perforate the casing where they want to create a seal - then SQUEEZE better grout in and create a seal BETWEEN THE CASING AND DRILL STEM.

The better grout could be more flowable and stonger. The other issue would be bonding factors between casing and the rock.

I love talking about cement - it makes me sound so cool!