EWR®-PHASE 4™ Resistivity Sensors

The EWR®-PHASE 4™ family of wireline-quality, high frequency LWD induction resistivity sensors measures both the phase shift and the attenuation for each of the four transmitter-receiver spacings. EWR-PHASE 4 sensors can operate in water- and oil-based muds, as well as in air- and foam-drilled boreholes.


  • Rt, Rxo and Di in invaded formations
  • Rv and Rh in anisotropic formations
  • High-resolution Rt in deviated wells and/or dipping beds
  • Pre-invasion Rt measurement in deeply invading formations
  • Pre-washout Rt measurement in unconsolidated formations
  • LWD replacement for wireline array resistivity tools

SOLAR™: this sensor also exists in the high temperature/high pressure version. Please refer to the SOLAR datasheet for exact specifications.

EWR-PHASE 4 Resistivity Sensors

EWR®-PHASE 4 Resistivity Sensor

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Summary Summary LWD Log Interpretation Charts Sign in required
This document provides an insight into the sensitivity of LWD measurements to changes in the borehole environment and the impact that this has on the evaluation of a reservoir.
Summary Summary Russia: Slimhole Resistivity Sensor Helps Invigorate Mature Field Sign in required
TNK-BP in Russia was looking to ncrease production from its mature Western Siberia oil fields. There was a pressing need for logging-while-drilling (LWD) resistivity tools that could help navigate to bypassed pockets of oil, however with 146-mm (5-3/4-inch) production casing already installed in most wells, a special slimhole LWD resistivity sensor was required.
Summary Summary Middle East: Operator Gathers Valuable Formation Features with the Only Service in Larger Hole Sizes Sign in required
Due to a lack of seismic data in a challenging remote location offshore in the Middle East, an operator was drilling several deepwater pilot holes for gas exploration in order to gain as much information as possible for well correlation and to gather insight into understanding the geological structure and depositional environment.
Summary Summary U.K. Offshore: Operator Saves Significant Rig Time by Gathering Complete Formation Evaluation Data in Real Time Sign in required
In an offshore U.K. well, an operator needed to obtain a complete formation evaluation (FE) data set to measure reservoir and overburden characteristics in a deviated well.
Summary Summary Oman: Operator Proves Cost Savings With LWD High-Resolution Imaging Service Sign in required
Borehole imaging is one of the most rapidly advancing technologies in wireline logging and logging while drilling (LWD). In an onshore horizontal well in Oman, an operator needed more details of the geology in the reservoir in order to gain a better understanding of the distribution of faults, natural fractures, borehole breakouts, and drilling-induced fractures along the well path.
Summary Summary Abu Dhabi: EWR-PHASE 4™ Sensor Saves Approximately $268,000 by Indicating Rock Quality Sign in required
The operator relogged the section with the EWR-PHASE 4 sensor in just nine hours because of its fast sampling rate, instead of the 24 hours it would have taken with the competitor's system.
Summary Summary EWR®-PHASE 4™ Electromagnetic Wave Resistivity Sensor
EWR®-PHASE 4™ sensor is a high-frequency LWD induction resistivity sensor.
Summary Summary EWR®-PHASE 4 Resistivity Sensor
Delivers excellent vertical resolution in low-resistivity, thinly-bedded formations in boreholes from 3-3/4 to 30 inches.
Summary Summary Logging-While-Drilling (LWD)
Halliburton delivers the highest quality borehole, early and accurate Logging-While-Drilling (LWD) formation evaluation, optimal wellbore placement, and maximum reservoir drainage. We continue to lead the industry with the widest array of MWD/LWD technologies.
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