Russian test facility allows direct inspection of bottom-hole assemblies under in situ conditions

This Uralmash 300 EYK drilling rig is situated atop a 50-m deep bottomhole assembly test shaft in Perm, Russia (Fig. 1) The upper section of the pressure chamber (first level), located next to the elevator, is part of a closed-loop system connected to a hydraulic compensator on the right. The compensator creates pressure on the back side of the pressure chamber, maintaining the desired hydrostatic pressure in the hole (Fig. 3 [40,620 bytes]). The central control room uses computer monitoring

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