The Client

End client: Oil and Gas Corporation Limited (ONGC). Main contractor: Carlton Industrial Engineers.

The Scope

Provision of Pre Engineering Data collection Procedure; carry out Ship Impact analysis of HY platform; global in-place analysis & impact of other jacket members; pushover analysis for repaired jacket; design and detail engineering of repair methodology preferably using grouted clamps of following major damages; AFC drawings for clamp fabrication; issue “fit to for purpose” certificate from the ONGC approved Third Party certifying agency.

QC inspection of fabrication of clamps and components necessary for the strengthening work; supply of all grout materials, tools, equipment and grouting personnel for the installation process; supervise installation and grout the unstressed grouted clamps as per the approved design; as-built drawings and close-out report with grouting certificates.

The Challenges

There was extensive structural damages to the East side of the Wellhead Platform ‘HY’ of Heera Field due to some collision by vessel. Nautec was to design an adequate strengthening option for the damaged structure and carry out the strengthening and repair work reinstating the structure to its original design purpose.

The Services

The team performed Detailed Engineering Analysis and design of the jacket level repair. The analysis of the jacket and the engineering design of the repair and strengthening method was carried out using SACS and ABAQUS software. Nautec carried out all engineering work in-house.

Repair work pertaining to structural damages to HY platform entailed installation supervision and grouting of the clamps onto the inadequate members using Nautec’s own UHPC grout NaX® Q140.

Client Benefit

The confidence that Clients derive from Nautec is that all the core areas of a brownfield execution is done by their in-house team utilizing in-house assets. Hence, at no point in time are there blind spots between the engineering team and the operations team. The crew has extensive experience in using UHPC and has direct access to the engineering team for knowledge sharing.

NaX® Premix series of Ultra High Performance grout is manufactured in-house and makes Nautec a strong and reliable player in the market.

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