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Time and tide prove challenging for Boart Longyear team

Drilling specialist Boart Longyear has been using rota sonic drilling methods to create site investigation boreholes for an oil and gas project on behalf of Contestoga-Rovers & Associates (Europe) (CRA).

Rota-sonic drilling method was chosen due to its speed of drilling and the quality of samples obtained while advancing a borehole through granular materials.

The boreholes on the beach were advanced through the beach deposits and into the underlying chalk while completing standard penetration tests (SPTs) at 1.5m to 3m spacings.

When advancing the boreholes close to low tide level the drilling team had about one hour to drill, sample and complete SPT tests to 15m depth.

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