Distributed Thermo-Anemometer Data Processing for Wellbore Fluid Phase Determination

Abstract

Data considered were temperature measured by the PLT -9.2 module and thermo-anemometry data measured by the PLT-0.6.3 module. The data were obtained from well production logging in a low-rate horizontal well. On the basis of an analysis of a 12-s thermo-anemometry measurement cycle, we propose a fast and automated fluid phase determination algorithm. The algorithm uses only 2 s of the cycle to reduce the risk of phase changes during measurements. Tests on field data consisting of approximately 1,500 cycles demonstrate stable fluid phase determination of water, oil, and gas. A comparison with expert interpretation of the same field data showed good agreement, with discrepancies between two interpretations primarily occurring during phase changes.