Research On The Measurement Of The Oil/water Two-phase Flow Based On The Density Wave Theory

Oil/water two-phase flow is very common in oil production wells of affusion oil field and the measurement of oil/water two-phase flow is the key of the oil/water two-phase profiling technique. The measurement of oil/Water two-phase flow is primarily accomplished by the combination of total flow rate and holdup measurement, and at present, the rotator flowmeter is used to measure the total flow rate. Since the rotator flowmeter has movable parts, which makes its responsibility behave nonlinearly under poor environment of me under hole whose fluids have very complex and changeful characteristics and affects the measurement precision. What's more, the widely used centralized measurement instrumentation meets problems in oil wells characterized with high production or high water cuts. So anew type of measurement and instrumentation is badly needed and developed which is suitable for non-centralized and stationary measurementBased on this idea, this study take the new type of oilAvater two-phase flow measurement and instrumentation development as the basic goal, cany out some theoretic exploration of measurement in order to improve oil/water two-phase flow well logging method and technique, and try to accomplish bom holdup and total flow rate measurement with one equipment simultaneously so as to push forward development of oilAvater two-phase flow well logging. Firstly, Flow patterns which related with the characteristics of measurement have been studied with both the time series analysis and density wave theory, which lay a solid foundation for oilAvater two-phase flow measurement Then a theoretic model of oil/water two-phase flow measurement based on stationary density wave theory has been brought up. This theoretic model employs the basic idea of correlation measurement, achieve the density wave speed by the correlation of the signals of upper and lower sensors, and get the total flow rate and water cut through the theoretic relationship of density wave speed and total flow rate as well as holdup with the help of drift flux model so as to accomplish the oil/water two-phase flow measurement At last, using the limited available experiment data, the theoretic model has been simplified into an applicable linear alternative which is suitable to homogeneous oil/water two-phase flow measurementTo accomplish the oil/water two-phase flow measurement using the density wave phenomena is of highly theoretically valuable for density wave theory research as well as oilAvater two-phase flow measurement research. To develop new type oil/water two-phase flow instrumentation based on this theoretic measurement method will be very applicable and promising.