Formation fluid tester tool for use in well flow line

摘要

The formation fluid tester tool, for use in a well flow line to analyse formation fluid during production, comprises an internal reflectance crystal 432 in contact with a fluid 452 in the flow line that includes formation fluid and a first optical channel 420a for carrying monochromatic incident light of a specific wavelength to the crystal. A second optical channel 420b carries light reflected from the internal reflectance crystal, the reflected light being responsive to an absorbance of the formation fluid at the specific wavelength. An optical assembly provides signals indicative of the energy of the incident light and the reflected light and a processor for determining an absorbance of the formation fluid at the wavelength from the signals indicative of the incident light and the reflected light. The source of the monochromatic light preferably comprises an acousto-optical tunable filter (AOTF) which supplies light to the optical channels and a broadband light source which supplies to the AOTF. Also claimed is a method of analysing a formation fluid in a well flow line during production.