Schlumberger

Industry Article: At-Bit Inclination, Gamma, and Imaging System Tracks Productive Zone in Complex Geology

At-Bit Inclination, Gamma, and Imaging System Tracks Productive Zone in Complex Geology
Publication: Journal of Petroleum Technology
Publication Date: 03/01/2013

In unconventional resource plays and fields with structural or stratigraphic complexities, reliable geosteering of horizontal laterals is essential to economic success. Each foot drilled out of zone represents a potential loss of production revenue. Using real-time logging-while-drilling (LWD) data can reduce directional drilling risk. However, conventional bed boundary imaging tools are typically located far behind the drill bit. This creates a significant lag in response time and increases the odds of exiting the target interval. Using the iPZIG at-bit inclination, gamma ray, and imaging technology, Schlumberger enabled Fidelity Exploration & Production to optimize well placement in a target formation of the Paradox Basin in Utah—despite unexpected faults and local changes in formation dip that were not clearly resolved with seismic data. Having the "closest-to-the-bit" sensor, the iPZIG system provides earlier bed boundary detection and facilitates more rapid geosteering adjustments, thereby maximizing productive reservoir contact even in the presence of complex geology.




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