In the new and improved methods and apparatus disclosed herein for determining the volumetric proportions of the different phases of well fluids, a fluid-investigating tool adapted for positioning in a production well is provided with an enclosed chamber which is continuously communicated with multiphasic well fluids exterior of the tool by upper and lower fluid siphon passages which isolate the chamber to allow fluids of different densities to remain in a segregated condition. A measuring device is cooperatively arranged within the fluid chamber for detecting the interface of segregated production fluids within the chamber to provide indications at the surface which are representative of the phase mixture or volumetric composition of the well fluids at the depth of investigation. Unique techniques and apparatus are also provided for calibrating the sampling tool from the surface to assure continued accurate measurements.
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