Geophysical Wireline Logging

Geophysical Wireline Advance logging tools High-tech logging can improve oil and gas production using multi-sonde logging tools for obtaining multiple

LOGGING 

Logging records various physical, chemical and electrical properties of rock/fluid mixtures in the wellbore enabling identification of hydrocarbon trapping conditions. Porosity-lithology logs detect channels behind casings, casing leaks, packer leaks, tubing leaks, water influx problems, cross-flow from reservoirs and production problems such as 'thief' zones in water injection wells. Temperature logs indicate the top of casing cement and locations of gas in the wellbore determined from abnormally cool temperatures of entry point.

Acoustic logs use sound waves in porosity and velocity calculations, plus predict blowout problems or detect unconsolidated formations.

Caliper logs detect mud cake buildups, washouts, casing damage and measures hole volume.
Dipmeter logs measures fault growth patterns and angles Resistivity logs such as : SP voltage logs analyze formation water resistivity in permeable zones. Induction logs induce currents into the formation via electromagnetic radiation coils, then measure invaded zone resistivity and water saturation.  

Micrologs use mini electrical arrays that calculate moved hydrocarbons in thin-bed resolutions Laterolog uses multi electrode arrays in salty drilling muds for water saturation and porosity measurements.

ADVANCED LOGGING TOOLS

High-tech logging can improve oil and gas production using multi-sonde logging tools for obtaining multiple data measurements per trip. Litho-density logs use photoelectric capture cross-sections (PE Curves) in identifying lithologies. Pulsed neutron logs bombard formations with neutrons then measure gamma radiation from neutron-hydrogen collisions in determining porosity and stratigraphy. Gamma ray logs resolve lithology problems by radioactivity measurements with marine shales generating more gamma rays than sandstone, limestone or dolomite. Gamma with density logs can estimate lithologies.

• [accordion]
• 1. Introduction to Well Logging
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• 2. Lesson 4 - Introduction to Well Logs
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• 3. Wireline Formation by Stewart George
• 4. Introduction To Wireline Log Interpretation by M. Nasir Khan
• 5. API VT 5 Wireline Operations and Procedure