In this stack, the NGI provides the local formation data at the bit, while the Periscope looks 15-20 feet around the borehole. The combination gives you "micro" precision (NGI) and "macro" vision (Periscope).
| Feature | Specification | |---------|---------------| | | Approx. 4.5 m (15 ft) | | Diameter | 2.5 in (63.5 mm) – slimhole compatible | | Detectors | 3 BGO scintillators (Near, Far, Long Spacing) | | Max Temp | 350°F (177°C) | | Max Pressure | 20,000 psi (138 MPa) | | Logging Speed | Up to 60 ft/min (18 m/min) – spectral mode | | Vertical Resolution | 6 in (15 cm) – standard; 2 in (5 cm) – high-res mode | | Depth of Investigation | 6–12 in (15–30 cm) into formation (dependent on density) | schlumberger ngi tool
When planning your next horizontal well, ask your SLB representative: "Is the NGI tool on the BHA?" If not, you are likely drilling blind. In this stack, the NGI provides the local
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