Silencing the Surge: Unveiling Water Cut Sources and Shutting the Flow in Heterogeneous Carbonate of the Gulf of Suez with 3D Far Field Sonic

Abstract

Abstract The field under study, situated in the Gulf of Suez, has witnessed notable success through extensive drilling operations, resulting in a substantial increase in production. However, this elevated production has brought about challenges, causing depletion in specific formations and a subsequent rise in water cuts, adversely impacting the overall field performance. Consequently, this research paper aims to identify the root cause of the heightened water cut, validate the findings, and devise a plan to mitigate the issue while enhancing recovery. To achieve this objective, a comprehensive analysis was conducted, integrating geological, petrophysical, and geomechanical aspects, alongside using sonic 3D-Far field imaging to locate the source of water influx precisely. The investigation into the source of water influx involved analyzing high-resolution borehole image logs to comprehend the characteristics around the wellbore. Fractures identified in the logs were scrutinized to determine their extent and openness within the formation. Acoustic, seismic, and petrophysical data were leveraged to assess fracture continuity at different depths, and the stability of these fractures was evaluated to understand their potential for fluid flow. A noise tool was employed to confirm the fractures contributing to the water influx, validating the presence of active pathways for fluid movement within the formation. Based on the comprehensive analysis, a mitigation plan was developed to address specific fractures responsible for the increased water cut. The plan aimed to minimize their impact on overall field performance, reduce the water cut, and improve recovery. The study identified fractures, vugs, and dissolution features in different formations by analyzing image, acoustic, and petrophysical data. Acoustic measurements (Monopole, Dipole, Stoneley) provided insights into properties across domains. Stoneley analysis assessed fracture openness, while dipole anisotropy characterized lateral extent. Image and acoustic data integration distinguished open and closed fractures using a forward model approach. Acoustic reflection surveys indicated fractures extending up to 20 meters deep. Geomechanical analysis identified fractures under stress conditions. Independent validation with a noise tool confirmed extensive fractures as the primary cause of high-water influx. The collected information informed a comprehensive well-completion plan. Sonic 3D-far-field imaging accurately identified water-producing fractures, underscoring their significance in field understanding. This study showcases the successful implementation of an integrated evaluation approach that effectively identified a diverse fracture network. It accurately pinpointed and validated the fractures responsible for the significant water cut and developed a mitigation plan to reduce water influx and enhance recovery in the field. The primary objective of these efforts was to improve overall field recovery.