A mud-slurry drilling contract for the Coal Board - to
sink a bore hole for monitoring water levels in mine shafts - hit
problems at 10am on May 4th 2010. At a depth of 30m the rock strata
was fissured, leading to the unwanted disappearance of the
mud-slurry used in the drilling operation! Nufins were contacted to
meet with the contractor the same morning and to specify a suitable
fast setting product that could be pumped in to plug and seal off
Due to the nature of the operation, our technical team specified
a choice of two materials which were sent to site that afternoon.
First selected was 'Nugrout Flowable Concrete' which is best pumped
through a Putzmeister P11 worm drive pump, but since the contractor
was unable to acquire such a pump at short notice and could only
acquire a Bauer colloidal slurry pump (not primarily designed to
pump micro-concrete), we proposed to revert to the other selected
option of 'Nugrout Hispec', a pre-bagged free flowing pourable
and/or pumpable grout.
The pour commenced at 4pm and by critical control of water
addition and observation of the product workability, we
successfully pumped approx 2m3 of bagged grout in 2.5 hours,
filling the borehole upwards from 30m to 11m deep. This effectively
stopped the downtime on the operation. As the grout bodied-up and
hardened, all leaks were plugged and the mud-drilling process was
recommenced after 12 hours the next morning.
The Coal Board and contractor were delighted with technical
support and service afforded to them. Nufins responded promptly to
a customer request with advice, product specification, delivery of
materials and site attendance by technical staff, all within a few
hours on the same day.