Ngi Tool - Schlumberger

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).

Sedimentology

: Differentiating facies and identifying stratigraphic features previously only visible in physical cores. schlumberger ngi tool

  1. Pre-job Modeling: Use offset well gamma logs to build a synthetic NGI response. Understand what the "look-up" and "look-down" curves will look like.
  2. Surface Calibration: Ensure the tool is zeroed on the surface to correct for magnetic interference and background radiation.
  3. Data Density: Configure the tool to transmit at the highest possible frequency. For horizontal wells, request gamma data every 10 seconds (or every 1.5 ft drilled).
  4. Cross-correlation: Do not rely solely on the NGI. Correlate its data with cuttings analysis from the shale shakers. If the NGI says "shale" but cuttings say "sand," stop and investigate.

: Provides significantly improved image resolution compared to earlier generations, though the measurement depth is relatively shallow (approximately 0.2 inches SLB (Schlumberger) NGI tool (Next Generation Imager) is

Multi-Pad Configuration

: The NGI-X utilizes multiple pads (A, B, C, D) to ensure high borehole coverage, which is critical for identifying natural and induced fractures . Pre-job Modeling: Use offset well gamma logs to

: Designed to record data while moving both up and down the borehole. Downlogging helps reduce "stick-slip" effects that often blur images, saving rig time. Photorealistic Visualization

In many workflows, the NGI is categorized alongside or as a successor to other high-tier imagers: