{"id":425,"date":"2026-03-30T15:00:13","date_gmt":"2026-03-30T14:00:13","guid":{"rendered":"https:\/\/pnnplus.com\/?page_id=425"},"modified":"2026-04-09T12:07:27","modified_gmt":"2026-04-09T11:07:27","slug":"pulsed-neutron-tool-2","status":"publish","type":"page","link":"https:\/\/pnnplus.com\/index.php\/pulsed-neutron-tool-2\/","title":{"rendered":"pnnPlus"},"content":{"rendered":"\n
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PNN – 1400.0000 <\/strong>PULSED NEUTRON NEUTRON TOOL<\/strong><\/h1>\n\n\n\n

PNN measures Sigma, the ability of material to capture thermal neutrons, in capture units (c.u.).<\/p>\n\n\n\n

PNN counts directly the thermal neutrons reaching the detectors after their interaction with the surrounding formation; therefore, the usual inference applied by common Thermal Decay tools\u2014where gamma rays are counted and high counts indicate high Sigma values\u2014is inverted with the PNN tool, where high counts correspond to low Sigma values. This has the significant advantage of reducing statistical uncertainties, particularly for low Sigma values.<\/p>\n\n\n\n

This direct measurement approach allows better differentiation in environments with low Sigma values, such as formations containing fresh water, oil, and\/or gas in the pore spaces, effectively overcoming the low-salinity formation water limitation commonly associated with standard Thermal Decay Time tools. Additionally, neutron readings are less affected by neutron activation; therefore, time-driven stop-check logging in areas of interest can further reduce statistical uncertainties at any desired depth.<\/p>\n\n\n\n

All of this makes the pnnPlus tool, in conjunction with our PNN processing and analysis, a highly competitive behind-casing formation evaluation tool for high to moderate water salinity formations, and the ultimate thermal decay solution for evaluating lower salinity and lower porosity formations.<\/p>\n\n\n\n

PNN Application <\/strong><\/h2>\n\n\n\n