Abstract
<jats:title>Abstract</jats:title> <jats:p>This paper presents a practical framework for deepening 30″ conductor pipe penetration as a preventive measure against platform instability. In 2017, a new platform experienced instability that resulted in significant tilting, resulting in loss of a well slot, platform damage, and costly remediation. Learning from this, a new platform with four wells was commissioned in 2025. Key improvements were established, including geophysical-geotechnical studies, structural considerations, drive-sub modifications, and an enhanced driving method for conductor installation.</jats:p> <jats:p>To address this challenge, an integrated multi-disciplinary approach was implemented, combining geophysical and geotechnical insights, structural engineering, and drilling expertise. The teams collaborated to assess subsurface risks and hazards, evaluate geotechnical data, and design both the driving strategy and conductor casing program. Determination of the safe conductor setting depth was carried out by integrating results from geotechnical investigations, platform structural requirements, pile depth considerations, conductor drivability analysis, and subsurface formation characteristics, ensuring a robust and reliable foundation for the platform.</jats:p> <jats:p>A comprehensive strategy was developed to install the 30″ conductor at the required depth to ensure wellbore integrity and long-term platform stability. In the planning stage, geophysical and geotechnical assessments were carried out to identify subsurface hazards, such as potential loss zones and shallow gas. Soil boring data were analyzed to determine formation strength, while pile platform information was incorporated to evaluate expected penetration, driving energy, and compression stresses. These studies indicated that the conductor had to be set deeper than conventional depths to mitigate potential platform integrity risks. Conductor drivability analysis demonstrated that the available hammer specifications were capable of achieving the target depth, provided frictional resistance at shallow intervals could be effectively managed. To address this challenge, supplementary measures were introduced, including the fabrication of customized drive-subs designed for the hammer and the application of the Drive-Clean-Drill method. Through the execution of this comprehensive driving strategy, supported by contingency planning, the 30″ conductor was successfully installed to the target depth in four wells. Subsequent operations—drilling the top-hole section, running, and cementing the surface casing—were completed without obstruction. Overall, the campaign was delivered safely, with zero non-productive time (NPT) and without compromising well or platform integrity.</jats:p> <jats:p>The novelty of this paper lies in the comprehensive strategy and operational improvements applied to conductor driving to mitigate platform instability. Through these design enhancements and optimized practices, the team successfully installed the 30″ conductor deeper than conventional designs, reducing the risk of platform integrity issues. The lessons learned and optimizations presented provide valuable insights and can serve as a reference for future conductor driving operations, particularly in similar offshore environments.</jats:p>