Cased Hole Formation Evaluation - CH

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This course teaches the skills required to recognize when cased-hole saturation logs add value, plan log runs to maximize effectiveness, and evaluate results. The study of Pulsed Neutron Capture and Carbon/Oxygen logs includes the physics that cause the logs to work, the details that cause differences between logs offered by different service companies, methods to calculate saturations from log results, and methods to use auxiliary traces to recognize fluid entry and distinguish oil from gas. The course includes examples of logs run by each service company and an explanation for the fact that logs from different service companies report different values.

Petrophysicists, core and log analysts, geoscientists, completion, reservoir and production engineers, and managers.

You will Learn:

Participants will learn how to:

  • Calculate saturations from Pulsed Neutron Capture (PNC) Logs
  • Correct petrophysical calculations for the influence of shaliness
  • Distinguish gas from liquids in the formation using log traces
  • Understand why it is possible and why it is difficult to convert PNC log measurement into density and neutron log measurements
  • Use Log-Inject-Log methods to maximize accuracy of saturations measured through casing
  • Analyze log traces to identify brine entry depths
  • Effectively use carbon/oxygen (C/O) logs to reflect saturations under conditions where PNC logs are ineffective
  • Decide whether PNC logs will deliver adequate results or C/O logs are required
  • Plan PNC and C/O log runs to maximize chances of obtaining the information desired
  • Evaluate through casing porosity and resistivity logs

Course Content:

  • Pulsed Neutron Capture Logs
  • Basics of neutron generation and gamma detections and how that leads to sigma
  • Basics of calculation of water saturation from sigma
  • Methods to correct the saturation calculation for shaliness
  • Log-Inject-Log measurements to maximize accuracy
  • Why logs from different service companies report different sigma values
  • Distinguishing gas from oil
  • Estimating porosity
  • Use of all the auxiliary traces on the logs
  • Use of oxygen activation to determine brine entry
  • Use of special modifications of the logs
  • Planning to maximize success of log runs
  • Carbon/Oxygen logs and How the logs work
  • Deciding when Carbon/Oxygen logs have a better chance for success
  • Planning log runs to maximize chances for success
  • New developments that promise improved Carbon/Oxygen logs

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