The Coaxial Line Moisture Meter To Explain The Methods Of Research

Water cut measurement of water oil two-phase flow is very important in production logging and it has been contributing to oilfield exploitation very much. With the development of oilfield exploitation, water cut meter has also been being updated in order to adapt the need of oilfield production logging.The measuring range of coaxial transmission line phase water cut meter is 0-100%. Therefore, it can meet present situation of oilfield exploitation, which for most oil wells water cut is high, because of the using of water-driving in oil production, while for some single well or different layers in a well water cut is low. Meanwhile coaxial line phase water cut meter has realized dynamic measuring of oil well water cut. And the detecting results objectively represent flowing state in pumping wells. The distinguishability and precision of the meter is high. But the accuracy still needs to be improved because of the complexity of water oil two-phase flow and the responding condition of the meter. Measurement theory of coaxial line phase water cut meter and flowing feature of water oil two-phase flow have been studied in this paper. And it has been found that the response of coaxial line phase water cut meter is not only related to water cut, but also related to temperature, salinity of formation water and flowing characteristics. Based on soft-measuring theory and operating theory of the meter, soft-measuring model of coaxial line phase water cut meter has been set up with directly obtainable facts such as flux, temperature of oil and water mixture and salinity of formation water. And frequency domain dynamic soft-measuring model has also been set up, with prominent forecast.Logging method and pre-processing method of logging data have been ascertained for the logging tool formed by coaxial line phase water cut meter and other function units such as temperature meter and flow meter. Data of 10 oil wells obtained by the logging tool has been interpreted using the soft-measuring model, and the result is accordant with data of ground measurement. It indicates that the soft measurement model of coaxial line phase water cut meter has high interpreting precision.