Publications

This paper presents a real-life scenario of a comingled- gas-well in one of Natuna A Block field that ceased production despite the presence of significant remaining gas potential, as determined by P/Z analysis. Regardless of the absence of apparent water production, surveillance activities revealed the presence of a water column within the wellbore, indicating an unexpected influx of water that circulated downhole and hindered the production of other zones.

A comprehensive investigation was then conducted to identify the source of water ingress. A thorough analysis of well logs, production data, and downhole surveillance information was performed to pinpoint the interval responsible for the water influx. A remedial solution utilizing a Master Surface Valve (MSV), installed since its initial completion across the field in the production tubing casing string, acted as a mechanical barrier to isolate and close off the water-producing zone, enabling the subsequent revival of gas production through the utilization of a mechanical shifting tool. The successful revival of the well prompted further actions within the gas field. The suspected water-producing intervals in the wellbore were effectively identified and isolated, leading to a reduction in water production and enhanced gas production from the affected wells.

The paper highlights the importance of accurately diagnosing and addressing unforeseen challenges in gas well operations. It underscores the significance of thorough surveillance and analysis in identifying and mitigating water influx, even in the absence of apparent water production.