Frac packs complicate PNC log evaluation

Clarke L. Bean, Syed A. Ali Chevron U.S.A. Production Co. New Orleans George N. Salaita Chevron Petroleum Technology Co. Houston Theoretical Sigma Calculations [7698 bytes] Borate-crosslinked fluids and/or ceramic proppants commonly included in frac-pack well completions can complicate pulsed neutron capture (PNC) log evaluation. PNC logs are routinely run in cased holes. Two common applications include identifying formation fluid and calculating the percent water saturation in the rock pore spaces near the well bore. PNC logs PNC tools fire bursts of high-energy neutrons into the borehole and surrounding formation. The neutrons collide with surrounding atoms and...

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