Whether you are landing a horizontal well in the Eagle Ford, drilling a high-angle appraisal well offshore Angola, or simply trying to avoid a water leg in a mature field, the NGI remains the unsung hero of the bottom hole assembly. It answers the two most important questions a driller can ask: "Where am I?" and "What am I in?"
A horizontal well targeting a 10-foot porous dolomite zone. Surrounding the target are dense, non-porous limestone and anhydrite. schlumberger ngi tool
The standard LWD resistivity tool (30 ft behind bit) indicates the dolomite is thinning. By the time the signal is processed, the bit has already drilled into the limestone floor. The well is a "geosteering miss," requiring a costly cement sidetrack. Whether you are landing a horizontal well in
In the high-stakes world of oil and gas exploration, understanding the true geometry of a reservoir is not just an advantage—it is a necessity. Drilling a well is an expensive gamble, and the difference between a commercial discovery and a dry hole often lies in the subtleties of formation evaluation. The standard LWD resistivity tool (30 ft behind