21 AUGUST 2024 WorldWide Drilling Resource® www.starironworks.com 257 Caroline Street Punxsutawney, PA 15767 800-927-0560 • 814-427-2555 Fax: 814-427-5164 SERVING THE CONSTRUCTION INDUSTRY Serving the Drilling Industry Updates on the North Irish Sea Array Project Adapted from Information by Robertson Geo Services The North Irish Sea Array, also known as NISA, is an offshore wind energy development project. Robertson Geo Services (RGS) was contracted to join the geotechnical survey vessel Seehorn, operated by Geoquip Marine, to conduct logging operations on the North Irish Sea Array off the coast of Dublin. Boarding the vessel in Aberdeen, they sailed around the top of Scotland and down into the Irish Sea to complete the survey of three boreholes. The drilling operations utilized a piggyback system to gather core samples of the mudstones and stiff clays for physical sampling, classification, and stress testing. Once each borehole had reached its target depth, the RGS engineer deployed three probes: j The caliper was run first to check borehole integrity and to provide useful quality control information for the subsequent PS (primary and seconary waves) Logging. j The PS Logger® probe measured primary and secondary wave velocities at three-foot intervals at depths of 213 feet. The resulting strength parameters derived from the velocities were to be used to feed into the foundation design calculations together with data from other sources including cone penetration and laboratory testing. j The High Resolution Acoustic Televiewer® produced an unwrapped oriented image of the borehole wall, delineating bed boundaries and fractures, as well as giving deviation data for the borehole. Once operational, the anticipated 35 to 46 turbines for the site are expected to produce clean, renewable energy for approximately 500,000 homes and businesses. C&G
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