Solution After an initial trial with the AMC BOS™, AMC had achieved strong results. For the second trial, AMC suggested the method be implemented from the commencement of the hole as a preventative measure against lost cirulation.
The AMC BOS™ comprises of a driller-operable, casing-while-drilling tool, the AMC BOS UNIT™ and lubricating rapid-fill polymer grout, the AMC BOS FIX™. Throughout the trial at hole 21*, AMC BOS FIX™ was injected at regular intervals, penetrating fractures and securing unstable rock by encasing the borehole wall with a thin lubricating membrane. AMC BOS™ was able to treat the application area, which consisted of semi-compact rock with fractured zones to improve stability, torque control and fluid losses from beginning to end.