Annulus Grouting of 8 Skirt Pile Sleeves at AYATSIL-B and 12 Skirt Pile Sleeves at AYATSIL-D
Heerema Marine Contractors Americas B.V.
Nautec’s scope of services for this project included the provision of qualified offshore grouting personnel and project management including reporting and QA/QC & HSE; provision of offshore grouting equipment and High Performance Cementitious (HPC) grout NaX™Q110.
A 2-day time window was allocated for the grouting works associated with the installation of Ayatsil-B and –D platforms at a water depth of –120m. For both grouting jobs the grout needed to achieve, as a minimum, a 24-hour (early) compressive strength of 44 MPa at 14 ̊C temperature at -120m and a long-term compressive strength (28-day strength) at 80 MPa.
Nautec mobilised a state-of-the-art silo system on Heerema’s DCV Balder for the grouting of 8 skirt pile sleeves (4 regular and 4 gripper sleeves) annuli on AYATSIL-B jacket and 12 skirt pile sleeves on AYATSIL-D jacket using Nautec’s proprietary HPC grout (NaX™ Q110). Production and delivery of grout according to PEMEX/ IMP’ specifications.
Nautec supplied NaX™ Q110 HPC material with high early age compressive strength and Young modulus to allow the platform jacket to be loaded with the topside within 24 hours after grouting. NaX™ Q110 has self-sealing properties because it contains aggregates that help reduce leakages. NaX™ Q110 self-sealing properties minimise and prevent further leakage as rubber seals may be damaged by pile driving. NaX™ Q110 is very cohesive; hence grout returns can clearly be observed therefore limiting wastage and reducing contingencies and costs for our Client.