Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 97

Fluid Sampler
The fluid sampler is analogous to a formation tester, the difference being that the
latter takes samples of the formation fluids but the former takes samples of the well
bore fluids. Figure 7.16 shows the tool. It is run into the well to the required depth
and then actuated by the operator on the surface. A valve opens and a sample cham-
ber fills with the fluids in the wellbore. The valve is then closed and the sample is
recovered and analyzed at the surface. For this purpose a mini-separator is used to
gauge the relative amounts of oil, water, and gas recovered.
Fig. 7.15 Optical fluid density as a function of wavelength. Image copyright Schlumberger. Used
with permission