Wireline LoggingIntroduction12/21/2010http://www.scribd.com/MouradHosniMourad Hosni

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Wireline logs: continuous recording of specific properties versusdepth, plotted on several types of charts.1

We mentioned before that Wireline is an armored cable, attached toits end specific instruments to record some helpful measurements.

This Wireline is lowered into the borehole after the drill string ispulled up at the end of each major stage of drilling.

Wireline tools record all measurements while being raised up from theborehole when they pass by various rock layers.

1 Examples will be shown in the proceeding researches.

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As shown in the previous figure, wireline logging system consists of amobile laboratory [truck], the armored cable, and the sonde at thelowered end of the wireline.

The wireline can be hundreds of feet long.

Types of wireline logging:

1- Wireline openhole logging2- Wireline cased hole logging

Wireline Openhole Logging:

It’s done after the borehole section is completed and the drill string ispulled out.

Openhole tools:

Gamma ray Natural gamma ray spectrometry Spontaneous potential Caliper Density Sonic Resistivity Formation pressure

Wireline Cased Hole Logging:

It’s done after the hole is cased and a completion string run to producethe well.

Cased-hole tools:

Cement bong log

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Casing collar locator Production logging Thermal decay tool Gamma ray spectrometry

All these measurements tools will be discussed in details through ourcoming researches.

Random photos of wireline tools:

The mobile laboratory

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References:

1- Darwin V. Ellis, Well Logging for Earth Scientists2- John Gluyas, Petroleum Geoscience3- Toby Darling, Well Logging and Formation Evaluation