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Center for Deep Earth Exploration (CDEX)

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Measurement While Coring (MWC)

Traditional coring methods do not record any in situ geophysical measurements while coring. Adding bottom hole environmental conditions (e.g. temperature, pressure) and drilling parameters (e.g. bit RPM, BHA inclination), as well as geophysical measurements (e.g. gamma radiation) to the core as it is being cut will dramatically increase the accuracy and usefulness of scientific measurements using core samples. These data are invaluable for improving drilling and coring safety with reference to specific sediments or rock types. This technology is currently being developed for use aboard Chikyu.

Objectives

MWC concept diagram.

MWC concept diagram.

A borehole inclination and azimuth measurement unit using a three-axis accelerometer and a direction meter (Left figure), and a display system (Right figure).

A borehole inclination and azimuth measurement unit using a three-axis accelerometer and a direction meter (Left figure), and a display system (Right figure).

An outline view of a temperature and shock (rapid acceleration) measurement system stored in a core barrel (model for 350℃, 500 G).

An outline view of a temperature and shock (rapid acceleration) measurement system stored in a core barrel (model for 350℃, 500 G).

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