It is often run as part of the or Sonic Scanner tool strings.
: By quantifying and differentiating between natural and induced fractures, engineers can better mitigate risks like sanding or borehole instability.
The NGI tool offers several advantages, including:
Conventional resistivity tools often fail to detect gas in certain formations due to: schlumberger ngi tool
: It supports fracture and fault detection, stratigraphic analysis, and the characterization of sedimentary deposits in deep-water and unconventional wells. Deployment and Legacy
| 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) |
However, the legacy NGI tool remains in active service in many regions (South America, Middle East mature fields, and North Sea) due to its lower cost and high mechanical reliability. For many operators, the "old" NGI is still the most cost-effective solution for gamma-guided geosteering. It is often run as part of the or Sonic Scanner tool strings
Data frames compiled from the NGI system map structural parameters through specific telemetry channels: Channel Prefix Data Type Mapped Impedance of Buttons (Amplitude) Resolves structural boundaries and lithology shifts. ZBPH Impedance of Buttons (Phase)
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To address these challenges, Schlumberger and other industry leaders are investing in research and development, focusing on: Deployment and Legacy | Feature | Specification |
When drilling through faulted or folded strata, the NGI provides a high-resolution gamma log that can be correlated in real-time with offset wells. By comparing the near-bit gamma to the memory gamma from a tool higher up the BHA (Bottom Hole Assembly), geologists can calculate structural dip. This tells them if they are drilling updip (good for oil) or downdip (risking water).
In conclusion, the Schlumberger NGI tool is a powerful technology that has transformed the oil and gas industry. Its advanced sensors, high-resolution imaging capabilities, and real-time data transmission have made it an essential component in the quest for efficient and accurate subsurface characterization. As the industry continues to evolve, we can expect to see further advancements and innovations related to this technology.