SLB (Schlumberger) NGI tool (Next Generation Imager) is a high-resolution borehole imaging tool designed to replace legacy systems like the Dual OBMI (Oil-Based Microimager). It is primarily used for formation evaluation in wells drilled with oil-based mud (OBM).
This guide is written for petroleum engineers, geologists, and petrophysicists who need to understand its purpose, physics, specifications, and applications.
The NGI system utilizes multiple pads (e.g., Pads A through D) with independent transmitters to ensure signal stability. schlumberger ngi tool
Dual Frequency: Capable of operating at multiple frequencies (e.g., Frequency 1 and Frequency 2) to capture varied impedance data, which is essential for characterizing different formation types.
The NGI tool incorporates several mechanical and electronic enhancements over previous generations: Sensor Configuration: SLB (Schlumberger) NGI tool (Next Generation Imager) is
High Environmental Tolerance: The tool is designed to operate reliably under high-pressure and high-temperature (HPHT) conditions common in deepwater and unconventional wells.
As drilling automation and closed-loop geosteering evolve, the philosophy of the NGI—placing sensors as close to the action as possible—will continue to define the future of reservoir navigation. For now, if you see a Schlumberger BHA going into the ground, chances are high that an NGI is leading the way, reading the rocks before anyone else. The NGI system utilizes multiple pads (e
No tool is perfect. Engineers must understand the limitations of the NGI:
The tool transmits electromagnetic waves from one antenna to a receiver. By comparing the phase shift and attenuation between receivers, the complex dielectric permittivity (( \varepsilon^* = \varepsilon' - j\varepsilon'' )) is derived.