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.
To understand why the Schlumberger NGI tool is a critical engineering milestone, it helps to look at legacy borehole telemetry. Traditional imaging tools, like the industry-standard FMI Fullbore Formation Microimager , revolutionized water-based mud logging by utilizing localized microresistivity arrays. However, when operators shifted heavily toward oil-based muds (OBM) and synthetic nonconductive invert-emulsions to stabilize reactive shales, electrical connectivity between the tool pads and the rock wall became highly insulated.
Quanta Geo service's high-resolution geological images accurately position 85 sidewall cores describe the natural fracture system. Ultrasonic Borehole Imager - Acoustic Imaging - SLB schlumberger ngi tool
Enhanced mechanical design allows for high-quality "downlogging," which reduces the artifacts caused by tool stick-slip during upward pulls. 4. Key Applications Paradigm 15 | PDF | Backup | File Format - Scribd
No tool is perfect. Engineers must understand the limitations of the NGI: The Schlumberger NGI tool is a powerful solution
Standard tools use coaxial antennas (loops parallel to the tool axis). The uses a combination of coaxial and tilted antennas. By measuring the phase shift and attenuation of EM waves as they pass through different geological layers, the tool calculates anisotropic resistivity (horizontal and vertical resistivity, Rh and Rv).
This paper explores the application of the (Next Generation Imager) tool in characterizing heterogeneous reservoir facies. Traditional imaging tools often struggle with coverage gaps in highly deviated wells or specific mud environments. The NGI platform overcomes these limitations through its innovative pad design and high-frequency transmitter system. We present a case study demonstrating how NGI data improves the identification of micro-fractures, secondary porosity, and thin-bed lamination, leading to more accurate integrated stratigraphic and structural reservoir models. 2. Introduction Ultrasonic Borehole Imager - Acoustic Imaging - SLB
The operator deployed the Schlumberger NGI tool on a Rotary Steerable System.