Schlumberger

HRLA High-Resolution Laterolog Array

True formation resistivity in thin-bedded, deeply invaded formations

The HRLA high-resolution laterolog array tool helps resolve the problem of determining true formation resistivity (Rt) in thinly bedded and deeply invaded formations to identify and estimate reserves. Because the multiple-frequency HRLA array measurements are simultaneously made from a common central electrode, they are naturally resolution-matched and depth-aligned for greater intradata accuracy. The five independent, actively focused HRLA array measurements are input to a 2D earth model and inversion scheme to account for borehole, shoulder bed, and invasion effects for a robust determination of Rt.

Reduce shoulder bed sensitivity for quicker, more accurate interpretation

Active focusing and multifrequency operation reduce the HRLA array’s measurement sensitivity to the shoulder bed effect that often complicates dual-laterolog interpretation. The result is less shoulder bed distortion than in traditional laterolog measurements to support quick, reliable wellsite interpretations.

Because hardware focusing is subject to physical limitations, the HRLA array also employs software focusing to enhance thin-bed definition. Mathematical superposition of the signals ensures that the focusing conditions are respected and resolves any voltage imbalances.

Improve logging efficiency and save rig time with bridleless operations

HRLA array spacing is optimized to obtain the maximum amount of information about the invasion profile for improved resistivity estimation. The absence of surface current return eliminates voltage reference effects and does not require using a bridle to electrically isolate the logging cable. In addition to reducing rig-up time, the bridleless HRLA array design paired with the tool’s through-wiring supports a wide range of tool combinations.

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Optimized Spacing for True Thin-Bed Resistivity

High-Resolution Laterolog Array image
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