April 23, 2012

New resistivity, imaging-while-drilling service

The MicroScope 475 high-resolution resistivity and imaging-while-drilling service is available to the industry.

On a single collar, the service provides 360o, high-resolution electrical images and laterolog resistivity measurements in conductive mud environments. The firm says its service is suited for use in diverse and challenging environments, including unconventional shale plays and carbonate and clastic reservoirs.

In a tight gas carbonate reservoir in Asia, MicroScope measurements facilitated formation evaluation and clearly identified and defined the structural dips, faults, and fractures along the horizontal section in a complex, thin, dolomite gas reservoir. The well was completed with an initial gas production of 120,000 cu m/day.

In Wyoming, the service helped tap the potential of the Niobrara formation in the Denver-Julesburg basin. Permeability and porosity in the Niobrara chalk are relatively low and production is usually enhanced by natural fractures, the company notes. Keeping the wellbore within the highly fractured layer required accurate real-time information to guide steering decisions. MicroScope images facilitated well placement and fracture analysis to optimize hydraulic fracturing stage designs, the company points out.

The tool acquires focused laterolog resistivity measurements and images at four different depths of investigation, with azimuthal sensitivity.

The 43⁄4-in. tool can be used in hole sizes of 57⁄8-61⁄2 in.

MicroScope azimuthally focused laterolog resistivity measurements are relatively unaffected by shoulder bed and anisotropy effects. The high-resolution data are acquired at four depths of investigation. These measurements enable users to identify thin beds, run invasion profile analysis, and develop better reserve estimates.

The LWD service produces high-resolution imaging in real-time and recorded mode. The real-time images enable geosteering decisions by identifying dipping beds, faults, and fractures. The user acquires full borehole coverage with nearly any combination of drilling and rotational speed—even in stick/slip environments.

Source: Schlumberger Ltd., 5599 San Felipe St., 17th Floor, Houston, TX 77056.

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