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Resistivity

This service is provided by two ranges of complementary equipment: standard and Compact™ tools. Standard tools are based on OD tools greater than 3 3/8-in., with upper limits of 20,000 PSI (137.9 MPa) and 350°F (177°C). Compact equipment is based on the latest technology in 2 1/4-in. sondes, providing unrivaled access and unique methods of conveyance, including memory operations.

Standard Tools
The simultaneous triple induction (STI) sensor, with high vertical resolution, is vital for determining true formation and flushed-zone resistivity. This induction device operates at three frequencies: 10, 20 and 40 kHz.

The micro resistivity tool (MRT) provides permeability indication with high vertical resolution for excellent determination of net pay. This tool also gives highly accurate flushed-zone resistivity measurements.

The dual lateral log (DLL) sensor simultaneously measures formation resistivity at two depths of investigation at ranges up to 40,000 ohm-m. It is the resistivity tool of choice for wells drilled with salt-saturated muds and for wells with high formation resistivity. The DLL sensor offers excellent resolution of thin beds down to 24 in. (61 cm).

COMPACT™ Tools
The Compact array induction (MAI) tool is a development of our highly successful digital induction sonde in a package just 10.8 ft (3.3 m) long and 2.25 in. (57 mm) diameter. It combines a unique operational versatility with superior measurement technology over a broad range of mud salinities and well diameters.

The high-resolution shallow focused electric (MFE) tool is an Rxo-sensitive mandrel device that combines excellent vertical resolution with high immunity to borehole wall rugosity.

The Compact dual lateral log Sonde (MDL) is the resistivity tool of choice in wells drilled with saline muds. Its unique design provides individually optimized deep and shallow penetration curves that share a common 2-ft (0.6-m) vertical resolution. Resolution sharing helps avoid anomalous bed-boundary effects on interpreted logs.

The Compact microlog (MML) and micro lateral log (MMR) make high-resolution, shallow penetration resistivity measurements, each from a single conformable pad held against the borehole wall by a sturdy caliper mechanism. The tools differ only in the type of pad used; they are interchangeable and can be stacked if both sets of measurements are required.


 
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