Pulsed-Neutron Log Interpretation

In the course of field development, as production progresses, the initial oil saturation changes both due to oil displacement by another fluid and due to release of gas from solution when pressure goes below the bubble point. To manage the reservoir effectively, reservoir/production engineers need to quantify the current saturation profile for every reservoir unit in the field. The movement of fluids within the reservoir and production from individual wells need constant monitoring to optimise production and recovery. Pulsed Neutron Logging is one such option that can provide vital information to locate bypassed oil and monitor waterflood fronts and fluid movement in the reservoir. This technique consists in bombarding the formation with high-energy neutron pulses generated by the tool and subsequent monitoring of the neutron or gamma-ray count rate decay caused by scattering and capturing in the formation.

I. Survey design
PNL tool – Pulsing neutrons into formation – Data recording – Data interpretation - Results.

II. Measurements
You can use your own PNL tool, or you can use ours. All our tools are calibrated and accurate in measurements.

III. Interpretation
We make interpretation and reinterpretation of measured data. We can get all the information encoded in neutron decays. Powerful mathematical models unlock all the potential of PNL data processing. More information – better results.

IV. Value
PNL provides information about formation porosity and saturation.
Sigma (Σ), Total porosity (TPHI), Neutron count, Saturation Water (SW), Saturation Gas (SG), Saturation Oil (SO) – all the parameters can be calculated from PNL decays.

  • Water invasion
  • Oil-water contact
  • Gas invansion
  • Gas-oil contact
  • Formation porosity
  • Lithology assessment