Design of Drilling Tool for Truth-preserving Sampling in Submarine Sedimentary Strata and the Application

Abstract:

As a main method of marine geological survey and resource exploration, drilling sampling techniques occupy a very important position in the field of ocean exploration. Seabed strata is mainly of soft-sediment, the conventional drilling with rotary sampling would easily damage the original status of samples with low sampling rate, so it is difficult to meet the requirements of scientific research. A mud pump pressure driven truth-preserving sediment sampling drilling tool was developed with wire-line coring technology to achieve truth-preserving sampling in submarine sedimentary strata. The test proves that the sediment sampling truth-preserving drilling tool can meet the strict requirements to the samples for marine geological and geotechnical experiments with high success rate, high operating efficiency, samples in situ and good original states.

Key words:marine drilling; sample drilling tool; drilling with sampling; sediment; truth-preserving sampling