U-tube Sampling

The U-tube was developed to provide large volume samples of uncontaminated aliquots of subsurface fluid. U-tube samples are recovered to the surface at reservoir pressure isolated from contamination. The method is particularly suited for multi-phase fluid sampling in deep boreholes, as it is effective at recovering mixtures of gases and liquids. The following CO2 storage projects incorporated U-tube samplers:

U-tube sampling is also a practical method for aqueous fluid sampling. U-tubes were installed in the following projects:

The U-tube sampling system - CO2CRC Otway Project Residual Gas Saturation Test.

For a detailed description of the U-tube sampling method, see:


Freifeld, B. M., 2009, The U-tube: a new paradigm in borehole fluid sampling, Scientific Drilling, 8, doi:10.2204/iodp.sd.8.07.2009