The flagship technology is the iPZIG at‑bit inclination, natural gamma ray, and imaging service *—the industry’s first image gamma and inclination tool positioned directly behind the drill bit.
The Schlumberger NGI tool is a powerful solution for where conventional resistivity methods fail. By directly measuring water-filled porosity via dielectric dispersion, it provides a robust ( S_xo ) independent of water salinity.
The primary value proposition of the NGI tool is its position . In conventional LWD, there is a significant lag—spatially and temporally—between the bit cutting rock and the sensors reading it. By the time the gamma ray reading reaches the surface, the bit may have already drilled tens of feet into an undesired zone. schlumberger ngi tool
For decades, high-definition borehole imaging was heavily reliant on conductive, water-based muds (WBM). Tools like the benchmark Fullbore Formation MicroImager (FMI) used direct electrical contact to map microresistivity variances. However, the global industry shift toward oil-based mud (OBM) and synthetic-invert emulsions—favored for drilling complex, high-pressure, high-temperature (HPHT) formations—introduced a massive obstacle.
Typically featuring four or more pads, the tool ensures high circumferential coverage of the borehole. The flagship technology is the iPZIG at‑bit inclination,
: In more advanced versions like the Rt Scanner Triaxial Induction Service , the tool measures resistivity in three dimensions ( Rvcap R sub v Rhcap R sub h
– By imaging the gamma ray azimuthally, geosteerers can detect an approaching shale bed 1–3 ft before the bit penetrates it, allowing for proactive trajectory adjustments. Conventional total‑gamma tools only detect a boundary after it is crossed. The primary value proposition of the NGI tool
For drilling engineers and geologists looking to deploy the NGI, follow these best practices: