Gap Analysis of Deepwater Drilling Riser Integrity Management Practices in Nigerian Deepwater Operations Compared to Gulf of Mexico Benchmark Standards

Marine drilling riser integrity management is a safety-critical discipline in deepwater petroleum operations, and the gap between current practices in Nigerian deepwater drilling campaigns and established benchmark standards from the Gulf of Mexico represents a significant operational risk area requiring systematic analysis. This study conducts a gap analysis of deepwater drilling riser integrity management practices in four Nigerian deepwater operations, comparing them against the API 16Q, API 16F, and OTC Technical Paper 24264 benchmark framework developed from Gulf of Mexico operational experience. Data were gathered through structured technical interviews with twenty-eight drilling engineering professionals with Nigerian deepwater experience, supplemented by review of riser inspection reports, riser analysis documentation, and disconnect event records from 2018 to 2022. Gap scoring was performed across eight functional areas: riser design documentation, fatigue analysis adequacy, vortex-induced vibration mitigation, emergency disconnect procedure adequacy, inspection programme comprehensiveness, wear and corrosion monitoring, connector make-up verification, and post-disconnect reinstatement protocols. Results indicate that fatigue analysis comprehensiveness and VIV mitigation monitoring represent the two most significant gaps relative to Gulf of Mexico standards, with Nigerian deepwater operations achieving 54 and 61 percent compliance respectively in these areas. Root cause analysis attributes the gaps primarily to reduced survey vessel access for riser inspection and to limited availability of VIV monitoring buoy systems in the Nigerian operational supply chain. A phased gap closure roadmap with resource and timeline estimates is presented. Keywords: drilling riser, integrity management, deepwater Nigeria, gap analysis, Gulf of Mexico benchmark.