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Pulsed Neutron Log Applications on Permian Carbonates in a Gas Field
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
During a large Infill drilling program, the Triple Combo logs (TCL) suite was replaced by the Pulsed Neutron-Density log (PND) in order to minimize the risk of open hole wireline operations, reduce rig time and acquire high quality formation evaluation data for completion/production purposes.
Field historical data has shown that thick- fine grained sands and salt cavern developments above the main carbonates as well as low reservoir pressure present a difficult problem to run open hole logging tools in each wellbore. Correlations between the open hole versus cased hole logs evaluation delivered accurate results. The PND was able to differentiate gas charged zones from sections with high water saturations, thus providing a more effective perforation strategy. Production logs from 5 wells confirm a good correlation between interpreted pay sections and gas rates from different perforation clusters.
Both logs could return similar results and therefore the TCL could be replaced by the PND during the infill program. The PND was helpful to identify pay sections to efficiently perforate and complete specific targets, avoid high water saturation lithofacies, reduce drilling rig time by approximately 1 day, as well as reducing the risk to get radioactive tools stuck in the open wellbore.