True Formation Resistivity in Thin-Bedded, Deeply Invaded Formations
Identify and estimate reserves with true formation resistivity
The HRLA high-resolution laterolog array tool attacks the problem of resolving true formation resistivity (Rt) in thinly bedded and deeply invaded formations. The HRLA tool has five independent, actively focused, depth- and resolution-matched measurements. These measurements are applied to a 2D Earth model and inversion scheme to simultaneously account for borehole, shoulder bed, and invasion effects in determining an accurate, more robust Rt.
Save rig time and improve logging efficiency with bridleless operations
HRLA array spacing is optimized to obtain the maximum amount of information about the invasion profile, improving resistivity estimations. Bridleless operations improve wellsite efficiency. The absence of the surface current return and through-wired design offer unprecedented combinability.
Reduce shoulder bed sensitivity
HRLA wellsite data, significantly less affected by shoulder beds than traditional laterolog measurements, supports making quick, reliable interpretations. Active focusing and multifrequency operation reduce the sensitivity to the shoulder bed effect that often complicates dual-laterolog interpretation.
Because hardware focusing is subject to physical limitations, the HRLA tool also employs software focusing. Mathematical superposition of the signals ensures the focusing conditions are respected and rectifies any voltage imbalances.
Benefits and features
- Identify and estimate reserves with Rt
- Save rig time and improve logging efficiency with bridleless operations
- Reduce shoulder bed sensitivity and enhance thin-bed definition with actively focused arrays
- Get simultaneous measurements naturally resolution-matched and depth-aligned with data obtained from a common central electrode using multiple frequencies
- Clearly identify invasion from five resistivity measurements at increasing depths of investigation
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