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The original post used the word Concrete -- Concrete is generally considered to contain aggregate. I believe you probably meant neat cement.
The shrinkage problems with cement are a definite concern, as noted by others. When concerned with pressurization,...
Have you looked into non-shrinking grout? We used that very successfully for correcting a drilling mistake that compromised the foundation of an apartment building. The driller we were using drilled into a piling, which we had to re-stabilize...
We are working on a GSHP project wherein return water may be pumped back into the ground under pressure through an injection well. Concern was expressed about the use of chip bentonite as the sealant versus cement as to the ability to withstand backpressure....
The concern with quick setting cement is the ability to control curing, which could result in shrinkage and cracking. Is it possible for you to first go around and install all the casings and then return to drill through to complete the well? I have...
Amec Foster Wheeler plc
Crosby Well Drilling Inc
Lake Wales, FL