Exploration • Drilling • Field Services
of performance and quality, and that the grout would develop the necessary strength after one week, to meet the 10 year storm condition.
Te final equipment configuration was capable of mixing and pumping up to 200cum per hour. During the testing, it was established that, to prevent dilution of the mix, the grout had to be pumped at a rate of 7-15cum per hour, until approximately 10 per cent of each sub compartment cavity was filled, then the pumping rate was steadily increased to
at its facility in Sharjah, United Arab Emirates, using an identical grout mix to that specified for the offshore installation and by simulating the conditions expected at the offshore location as closely as possible. Equipment function testing and a comprehensive
laboratory testing programme using the cubes made from the mixes, confirmed that the equipment was capable of exceeding project requirements in terms
160cum per hour. Te grout mix also needed a high viscosity to
allow it to be pumped from the work vessel, up 25m to the top of the GBS, then down 50m into the platform shafts to the distribution manifold and then into the under base cavities.
After mobilising all equipment and sodium silicate to Singapore, a four day load out and equipment testing programme was undertaken, including the delivery at the dockside of the 2260 tonnes of cement into the ULO silos and inboard tanks on several vessels. In the field, the grout delivery system was set up such that there were two manually controlled manifolds in the GBS shaft, each fed by a 4-inch grout hose from the pumps on the vessel. One manifold was used to fill large compartments and the second was used to fill two separate, smaller compartments simultaneously, meaning that three compartments were being filled with grout ant any point in time. Te offshore campaign went very smoothly and the under base grouting operation was successfully completed in 71 hours, using 15 ULO specialist personnel to manage and control the grouting operations. ●
For more information ✔ at
www.engineerlive.com/iog
Ted Allan is Regional Manager, Asia ULOSEA Pte Ltd; Harvey Lee is CEO ULO Systems; Barry Robinson is Equipment Manager, ULO Systems; Colin Reilly is Operations Manager, ULO Systems. ULO Systems LLC is based in Sharjah, UAE.
www.ulosystems.com
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