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Repair of Conductor Casings using Engineered Grouted Clamps

It was observed that the PA platform had a parted conductor casing, exposing the internal casings. NauticAWT was awarded the job to carry out structural integrity analysis; develop a repair methodology to reinstate the damaged section and structural integrity of the conductor. 

The Scope

  • Pre-Engineering Survey of the damaged conductor casing
  • Carry out Engineering Design & Analysis
  • Carry out design of External Grouted Clamp
  • Fabrication & Installation of External Grouted clamp
  • Alignment of the damaged casing & Installation of clamp offshore
  • Grouting of the annulus between the clamp & conductor casing
  • Post installation survey & final documentation

The Services

  • Project Management services including reporting, QA/QC
  • Provision of qualified & experienced onshore and offshore personnel
  • Provision of equipment i.e. mixers, pumps, downhole camera, HP water jetting etc. for executing the work scope
  • Supply of fabricated clamps, bolts & nuts
  • Supply of Ultra-high performance cementitious (UHPC) mix NaX™ Q140 along with binder lubricant mix

The Challenges

  • High tide posed a major challenge during the installation of the clamp due to lower elevation being at -3m i.e. splash zone area. This meant that the cleaning and installation of the clamp was hampered during high tide but by monitoring tide charts and patterns on a regular basis the team managed to carry out the cleaning and installation related activities during low tide.

Client Benefit

  • The whole process was carried out without the use of divers; an approach which resulted in vast time and cost savings for the Client
  • Stage wise inspection of the fabricated clamp in consort with client and third party inspector, ensured the quality of the fabricated clamp
  • Stage wise inspection and preparation of IMIR (Incoming Material Inspection Release Note) ensured the use of correct specification and quality of materials throughout the project
  • Close interaction with the client representative ensured safe and timely completion of the project