... , HQ, PQ, NQ2, HQ3, PQ3 T2, T6, LTK NMLC, HMLC, NX NW, HW, PW, NWT, HWF Specialisted in ... :Wireline double core barrels are primarily used in deep coring. With an overshot device, they eliminate the need ... Barrels:They are geotechnical core barrels primarily designed for coring relative soft formation in using face-discharge bits. ... )(); Core barrel assembly NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC