LWD Geosteering


LWD Geosteering Bulk Density Image

Maximize reservoir exposure with real-time formation evaluation and interpretation from geosteering experts that allow directional drillers to adjust well trajectories on the fly. Keep wellbores in the most productive zones by identifying formation dips, bed thickness, and fractures combined with image analysis, forward modeling, and recognition of geologic boundaries while drilling.

LWD (logging-while-drilling) data—such as gamma ray, porosity, resistivity, organic content, spectroscopy, brittleness, and density—is critical for accurate placement of the wellbore within the sweet spot and for characterizing the reservoir to optimize the stimulation design.

LWD Geosteering Gamma Ray

Weatherford LWD geosteering services uses real-time data while drilling to determine the best course for your drilling operation.

The Weatherford GuideWave® azimuthal-resistivity tool is designed to accurately land and navigate a horizontal well in a geologic target. Our SpectralWave® spectral-azimuthal gamma ray LWD sensor helps determine dip angle and detect bed boundaries so geosteering engineers can keep the well in the sweet spot throughout long lateral sections. Weatherford experts use techniques such as pre-job, 3D-geosteering modeling, 24-hour geosteering support-while-drilling, and extensive end-of-well reporting to keep you informed and your project on the optimal course toward the desired reservoir at all times.

LWD Geosteering GuideWave

The GuideWave tool provides key, deep-reading measurements to accurately land and navigate a horizontal well within a geologic target.

The unique design of the GuideWave tool features radial, axial, and tilted-antenna orientations that provide measurements for accurately determining distance-to-boundary and formation resistivity. Phase and attenuation resistivities are measured with multiple antenna spacings and frequencies, all of which are fully compensated to eliminate receiver drift and reduce borehole effects.

Weatherford geosteering systems enable by-the-moment reactions to the drilling environment, which provide greater control for reaching specific targets and enhanced production.

LWD Geosteering Operations

Available Geosteering Technologies:


Precision gamma ray imaging in real time

Weatherford SpectralWave spectral azimuthal gamma ray sensor provides real-time spectral gamma ray data (K, U, Th), azimuthal gamma ray borehole images, and precise total gamma ray information while drilling. The SpectralWave sensor is particularly valuable in shale reservoir development, where the real-time borehole images facilitate geosteering and provide formation structural information. The spectral gamma ray data provides interpretations of shale reservoir organic richness and clay content. This single LWD tool delivers superior value for unconventional reservoir well placement and evaluation.

Geosteering Applications

  • Geosteering with high-quality, real-time, up-down four-quadrant, or 16-bin gamma ray borehole images. Real-time images provide formation-dip information and show the relative angle between the wellbore and bedding planes. This indicates whether the horizontal wellbore is drilling stratigraphically up or down using evaluations of shale organic content from relationships between uranium and total organic carbon (TOC).

  • Evaluation of shale reservoir clay content from potassium and thorium, even in the presence of kerogen-associated uranium, which invalidates clay evaluation from total gamma ray.

  • Accurate well-to-well correlations from high-precision total gamma ray measurements.

  • Clay typing from K, U, and Th data.


Horizontal drilling precision and agility

Weatherford GuideWave azimuthal resistivity  tool is designed to accurately land and navigate a horizontal well in a geologic target. In addition to most of the conventional phase and attenuation dipole measurements made by the conventional multi-frequency resistivity (MFR™) tool, the tool adds deep and ultradeep azimuthal measurements at three frequencies using two antenna-receiver spacings. The tool provides a symmetrical array of both X- and Z component antennas to calculate eight pairs of up/down resistivities at different depths of investigation. Given the depth of investigation and the directionality of the azimuthal signatures along with 360° bed-boundary detection, Weatherford geosteering services can proactively geosteer laterals into the sweet spot, regardless of complex geometries. The tool optimizes production and decreases drilling costs by increasing reservoir contact, mitigating drilling hazards, avoiding fluid contacts, and eliminating sidetracks. The tool can be used with any mud system.

Geosteering Applications

  • Facilitates proactive geosteering in complex reservoirs where channel sands, pinch outs, unconformities, and fluid contacts are present.

  • Provides a unique correlation solution where conventional responses in target zones exhibit symmetry across the sections through the directionality of the azimuthal measurements.

  • Reserves that were previously considered economically marginal are now viable by enhanced accuracy in placement of the borehole.


Multi-directional, bulk-density, and standoff imaging in real time

Weatherford AZD (azimuthal density) sensor provides highly accurate bulk density and standoff images in real time as well as recorded operations for detailed geosteering performance. The AZD sensor can provide all measurements azimuthally—four quadrants in real time and 16 sectors while in recorded mode. The AZD sensor uses a two-axis magnetometer, which synchronizes and orients itself to the directional sensor at each connection. This azimuthally bins the density data and generates bulk-density and standoff images. For the real-time azimuthal data, the AZD sensor groups the 16 sectors into four quadrants and provides a quadrant-density image in real time as well as up, down, left, or right bulk-density measurements.

Geosteering Applications

  • Real-time and recorded RHOB and standoff images

  • Images provided are four quadrants in real time and 16 sectors in recorded mode.


360-borehole microimaging while drilling

Weatherford logging-while-drilling (LWD) SineWave microimager provides high-resolution borehole images (comparable to wireline microresistivity sensors) while drilling in a wide range of water-based mud conditions. High-resolution SineWave microimager images can reveal natural and induced fractures, faults, vugs, and fine-scale bedding features to provide detailed structural and stratigraphic geological information. Advantages of the SineWave microimager include full 360-degree borehole coverage and real-time images for proactive geosteering and early formation evaluation.

Geosteering Applications

  • Determination of the location and orientation of faults

  • Evaluation of thinly-bedded formations

  • Structural-dip information

  • Stratigraphic dip and facies characterization

Visean information service

Web-based, real-time, LWD data

Weatherford Visean information service delivers critical LWD wellsite data over the Internet in real time, which streamlines information flow and enables clients to more effectively leverage their highly skilled personnel. The service integrates a suite of powerful tools to support visualization, printing, export, and real-time reporting of all critical mud-logging and electronic-drilling-recorder data.

Geosteering Applications

  • Remote, real-time monitoring of LWD data

  • Support for mud-logging and drilling-recorder data

  • Management of drilling-project-related documents and reports