Provision of grouting services for Zawtika 1B Wellhead Platforms (WP4) with 12 skirt piles each (4 x 3 clusters). Each cluster is formed with two skirt piles without gripper (P1 to P8) and one skirt pile with gripper (P9 to P12).

The Client 

COOEC is the main contractor and installation company with end client being PTTEP, Thailand.

Nautec Disciplines 

Provision of grouting services for the installation of subsea structures – Jacket leg annuli grouting.

The Scope 

The scope of services included the provision of OPC type II material and NaX® Q80; the provision of offshore grouting equipment, silos, offshore laboratory and necessary consumables; the provision of qualified offshore grouting personnel; and the provision of project management including reporting, QA/QC.

The Challenges 

Due to limited space on the work barge deck we were only allowed to use 4 silos. This meant that during the grouting procedure we needed to blow the OPC from the AHT vessel by air compressor to our silos which were located on the work barge.

The Services  

Nautec carried out the grouting for wellhead platform WP4 as part of the installation procedure for a total of 4 platforms. Grouting of the pile sleeve annuli was carried out from the work barge using a combination of preinstalled grout lines on the platform structure and flexible grout hoses.

Client Benefit 

We used planetary mixers with a screw conveyor system which allowed for better mixing. NaX® Q80 material was supplied as contingency in case we would need to set the bottom plug.

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