oa Time-Lapse Monitoring of Fluid Contacts in Low Salinity Formation using Pulsed Neutron Data

Effective monitoring of fluid contacts in oil and gas reservoirs is essential for optimizing production, preventing early water breakthrough, and ensuring efficient hydrocarbon recovery. In depleted fields, such as those in Dnieper-Donets basin (DDb), tracking saturation changes over time helps operators make informed decisions about production strategies. One of the most reliable technologies for this purpose is Multidetector Pulsed Neutron Logging (MDPNL), which enables real-time analysis of reservoir conditions through cased wells.

This paper examines the use of MDPNL in Sigma mode to monitor fluid contacts in one of the gas fields located the axial central part of the DDb. The evolution of pulsed neutron logging technologies, highlighting the advantages of modern MDPNL tools with advanced detector arrays is outlined. The case study demonstrates the deployment of MDPNL technology for tracking gas-water contact (GWC) before and after production.

The results demonstrate the effectiveness of MDPNL technology in overcoming challenges posed by low-salinity formations. By enabling real-time monitoring without disrupting production, this technology supports strategic decision-making, enhances recovery efficiency, and optimizes field development in mature reservoirs. The findings support the broader adoption of MDPNL technology in Ukraine’s oil and gas fields to enhance recovery and optimize production strategies.