NeoScope Sourceless Formation Evaluation-While-Drilling Service | Schlumberger


Sourceless formation evaluation-while-drilling service

Avoid complex abandonment procedures in exploration wells
Provide comprehensive petrophysical measurements in real time without chemical sources
Evaluate reservoir quality in unconventional plays
Use an extensive suite of sourceless measurements
Remove transportation, handling risks, and chemical source costs
Save rig time and risks by eliminating source loading and unloading

The NeoScope sourceless formation evaluation-while-drilling service reduces risk by eliminating the need for chemical sources in logging while drilling. As the industry’s only sourceless formation evaluation-while-drilling solution, the NeoScope service uses unique pulsed neutron generator technology in the shortest multifunction LWD service collar available.

Exploration drilling without chemical sources

In exploration drilling, the NeoScope service eliminates the need for chemical sources, avoids complex abandonment procedures, provides comprehensive petrophysical measurements in real time, and saves rig time through early evaluation to optimize drilling and logging programs.

Sourceless measurements in unconventional plays

In unconventional plays, the NeoScope service offers an extensive suite of sourceless measurements to evaluate reservoir quality, provides critical data to optimize completion quality, provides sourceless measurements in real time for better well placement, and removes transportation and handling risks and the costs of chemical sources.

Less rig time and risks in any drilling operation

In everyday logging, the NeoScope service saves rig time and mitigates risks by eliminating source loading and unloading, provides all measurements close to the bit, increases efficiency and safety by integrating all sensors in one collar, and avoids complex sidetracking and lengthy fishing operations.

Today, the NeoScope service is the only sourceless formation evaluation technology available that includes a dual azimuthal caliper, sigma, and spectroscopy.

Two Schlumberger technicians adjust an LWD tool on a drilling rig floor

Gamma-ray, ultrasonic, and propagation resistivity measurements

The NeoScope service acquires natural gamma ray measurements, 360° borehole images, and resistivity measurements downhole.

Azimuthal natural gamma ray
Total gamma ray measurements are acquired using a large, shielded detector with high azimuthal sensitivity for delivery of gamma ray images.
Azimuthal ultrasonic caliper
Two, 180°-opposed ultrasonic transducers located just above the stabilizer measure borehole diameter, acquiring 16-sector image of the borehole shape while rotating.
Propagation resistivity
Borehole-compensated phase shift and attenuation resistivities are taken at two frequencies and five spacings with measurements updated every 2 seconds.
A log from the NeoScope service showing various gamma ray, borehole shape, resistivity, and invasion profile tracks

Drilling environment measurements

The NeoScope service also measures environmental properties, such as temperature, pressure, shocks and vibrations, and more.

Three-axis shock-and-vibration measurements
The service measures axial, lateral, and torsional shock amplitude, shock frequency, and vibrational energy to which the collar is subjected.
Annular pressure
Measured by a pressure transducer in the tool, the system enables effective mud weights to be monitored for borehole stability applications.
Annular temperature
Annular temperature is measured at same point as annular pressure, providing insight into mud condition, temperature experienced by the LWD tool, and operating temperature for environmental correction of formation measurements.
Near-bit inclination
Inclination is derived by a single-axis accelerometer located near the base of the tool.
A log from the NeoScope service showing various borehole enlargement, borehole shape, and drilling mechanics tracks

Sourceless PNG-based spectroscopy, sigma, NG-density, and neutron-porosity measurements

In addition, the NeoScope service can distinguish formation fluids, determine the formation hydrogen index, and determine the sourceless neutron gamma density from gamma rays—enabling conventional formation evaluation without a nuclear source.

Neutron-gamma density
Using the pulsed neutron generator (PNG) and a series of detectors, the NeoScope tool determines sourceless neutron-gamma density (SNGD) from gamma rays. SNGD can replace the traditional gamma-gamma-density measurement, enabling conventional formation evaluation without the use of a nuclear source.
Thermal-neutron porosity
Using high-energy PNG neutrons with a higher count rate than traditional chemical nuclear sources enables determination of the formation hydrogen index (HI). HI measurements are less sensitive to environmental conditions than the corresponding thermal neutron porosity measurement.
Sigma, which is primarily sensitive to the presence of chlorine, is used to provide a resistivity-independent formation saturation evaluation, to distinguish formation fluids and to identify low-resistivity pay zones while drilling.
Spectroscopy data are acquired by a short-spaced gamma ray detector performing a spectral analysis. Spectroscopy computations are performed downhole, enabling real-time identification of the elemental composition of the formation, formation grain nuclear response, and lithology determination. 
A log from the NeoScope service showing various mineralogy, formation sigma, and density-neutron porosity tracks

Integrated sourceless measurement interpretation

The NeoScope service enables visualization of the complete suite of measurements in a single workspace that combines 2D and 3D information.

A log from the NeoScope service showing various water saturation, volumetric proportions, permeability, and flow profile tracks
Sourceless formation evaluation-while-drilling service
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