The core barrel and the casing are advanced together, ensuring a high quality sample recovery and a stable borehole. When full, the core barrel is de-latched from the lead length of casing, brought to deck level and the sample extruded horizontally. In softer soils we can utilise an offshore standard wireline operated piston sampler providing high quality undisturbed samples in soft sediments.
Guar gum is used to form the flush medium during drilling operations. It is mixed with seawater, and the resulting ‘mud’ or flush is then pumped downhole, providing lubrication during drilling, stabilising the borehole and lifting away the cuttings from the base of the hole.