A horizontal well targeting a 10-foot porous dolomite zone. Surrounding the target are dense, non-porous limestone and anhydrite.
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. schlumberger ngi tool
The NGI tool incorporates several mechanical and electronic enhancements over previous generations: Sensor Configuration: A horizontal well targeting a 10-foot porous dolomite zone
: Provides critical data to decide where to place perforations or hydraulic fractures by identifying "hard streaks" or natural fracture networks. schlumberger ngi tool
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