Dean E. Gaddy Drilling Editor
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 and control equipment to operate and record test activities (Fig. 4 [21,351 bytes]).
The rock chamber, to be installed in the lowest ...