3. Please determine the value of for centred (max points) and eccentered (max 10

Question

3. Please determine the value of for centred (max points) and eccentered (max 10 points) positions of the tool, for density of the mud equal with 1.4 g/cm3, borehole diameter being positioned at the number equal with your Rec using Gamma ray log correction chart, presented in the next figure. Please comment, with at least 20 correct words, each result of centered (max 10 points) and eccentered (max 10 points). 10 Borehole Diameter (mm) 150 200 250 300 350 400 4S0 5.0 4.0 Centred Eccentred 3.0 PI 2.0 2.0 1.2 0.8 0.7 0.6 05L 18 20 16 6 8 10 12 14 18 Borehole Diameter (inches)

Explanation / Answer

For Eccentered: GR(corr)/GR(log) with mud density 1.4gm/cc = 1.4

For Centered: GR(corr)/GR(log) with mud density 1.4gm/cc = 1.9

The value for centered is high as natural gamma ray emitted for centered borehole is high because the sonde gets perpendicular response from the borehole.

While for eccentered only a component of response get noticed by the sonde.

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