• Structural Integrity Assessment of a Ship-impacted Wellhead Platform

    Zakum Development Company

    Structural Integrity Assessment of a Ship-impacted Wellhead Platform

    Abu Dhabi, United Arab Emirates

Project Summary

Project

The USD 3 million project required Zakum Development Company (ZADCO) to evaluate and reinstate the structural integrity of an Abu Dhabi wellhead platform for resuming oil production after a ship collision. To perform the assessment and justify the resulting insurance claim, ZADCO needed to prepare a structural design brief, model pile soil interaction to determine safety of the platform and piles, and simulate the collision and post impact behavior of the structure. Given the varying hardness of the soil, uncertain vessel speed data, and an outdated model, ZADCO needed to utilize offshore modeling and analysis software to accurately assess the damage.

Solution

ZADCO relied on Bentley SACS to perform iterative modeling and analysis, accurately simulate the impact, and identify potential threats to the integrity of the platform. Approximate vessel speed was estimated by comparing the local damages against measured damages. Using Bentley’s comprehensive, integrated software, ZADCO carried out preliminary ship impact analysis in house, optimized the inspection scope, and identified critical subsea nodes to help understand the post-impact behavior of the platform to help determine the repairs needed in order to resume oil production.

Outcome

Using Bentley SACS to perform preliminary ship impact analysis in house, while outsourcing the detailed engineering, ZADCO reduced project time and costs. Identification of critical subsea nodes optimized inspection, reducing inspection time from 64 to 18 working days. Understanding post impact behavior and determining potential threats to the integrity of the platform mitigated risk, improved safety, and prevented further damage to the facility and the marine environment. ZADCO’s work in SACS resulted in an early release of the platform back to operations, and enabled the company to justify the insurance claims.

Software

Bentley SACS provided ZADCO the comprehensive, iterative design and modeling capabilities necessary to evaluate and reinstate the structural integrity of the wellhead platform for resuming oil production ahead of schedule. The SACS Collapse module helped accurately analyze and simulate the ship impact, identifying critical nodes that reduced inspection dive time by 75 percent. Using SACS for its assessment enabled ZADCO to understand the post impact behavior and determine potential threats to the integrity of the platform, effectively mitigating environmental risk and improving overall operation.
Outcome/Facts
  • ZADCO used SACS Collapse to optimize the inspection scope, identifying critical subsea nodes to reduce inspection dive time by 75 percent.
  • The team’s efforts combined with the iterative design and modeling capabilities of Bentley SACS allowed the company to justify the insurance claims resulting from the accident.
  • Using Bentley SACS to assess the structural integrity of a ship-impacted oil wellhead in Abu Dhabi resulted in the early resumption of oil production.
  • Performing preliminary ship impact analysis in house with SACS, while outsourcing the detailed engineering, significantly reduced costs on the USD 3 million assessment project.
Quote:
  • “SACS software and its tailor-made enhancements is a very useful tool for structural integrity engineers where a quick workable solution is required in the shortest possible time.”

    Wilson John structural integrity engineer Zakum Development Company