Introduction To Cased-Hole Evaluations
YOU WILL LEARN HOW TO:
• Determine adequacy of PNC capture vs. C/O logging methods for saturation calculation, especially through complicated well bores and in complex formations
• Calculate water and steam saturations from Pulsed Neutron Capture (PNC) Logs
• Correct petrophysical calculations for the influence of shaliness
• Distinguishgas/steamfromliquids
• Compute oil saturation directly from Carbon/Oxygen technique
• Locate water entry and judge zonal communication
• Judge where specialty methods, such as Log-Inject-Log to estimate remaining oil vs. residual oil saturation, pseudo-density, etc., may not work
• Makeappropriatetoolchoices
• Perform interpretation QC and plan logging jobs
Audiance
Geologists, formation evaluations specialists, completion, reservoir and production engineers, and managers who may be making technology- and tool-choice decisions.
Prérequis
Knowledge of the basic principles of nodal analysis and basic computer skills are required.
• Basics and application of nuclear logging in general (briefly) and cased-hole logging in particular
• Attributes of various modern dual-detector and emerging multi-detector cased-hole logging tools used in the industry
• Cased-hole application of pulsed neutron capture (PNC) methods in clean and shaly formations, carbon/oxygen logging in low or variable salinity conditions in water and steam floods where PNC methods do not work, and direct neutron (PNN) methods to Locate oil/ water, gas/liquid, or steam/liquid contacts
• Compute water, oil and gas/steam saturation (in steam floods), and residual saturation using log-inject-log methods.
• Estimate pseudo-density and porosity (special cases)
• Make informed tool and measurements choices
• Makeoperationsdecisions.
• Application of above in open-hole completions
• Differences in saturation interpretation methods across vendors
• Oxygen activation to locate water entry
• Job planning and best practice parameters for successful monitoring.
