Research On Interpretation Method Of Production Profile Of Dual-frequency Microwave Low-yield Oil Well

With the development of the oilfield entering the later stage,the production of oil wells is getting lower and lower,while the water cut is getting higher and higher,making the measurement of water cut a problem.The water cut is an important measurement parameter of the production profile logging.Accurate measurement of the water holdup is an exact assessment of the production of each layer and the basis for the development of a rational development plan.The current logging methods are unable to meet requirements of measuring 0%-100%of water content.For this reason,the dual-frequency microwave water holdup instrument was developed.In order for the dual-frequency microwave water holdup instrument to be applied in the oil field as soon as possible,corresponding interpretation methods must be developed as soon as possible.In the second chapter of this dissertation,the principle of measurement of dual-frequency microwave water-holding instrument is analyzed,and the influencing factors of well-logging response are analyzed.In the third chapter,By analyzing of the data of numerical simulation experiments,the relationship between relative permittivity and phase difference at different frequencies and the influence of the degree of mineralization on the phase difference are obtained.From the experimental data of the two-phase flow of dual-frequency microwave water holdup,and the relationship between the flow-concentrating flowmeter and dual-frequency microwave water holdup rate instrument with the instrument response was analyzed.The calculation method of water holding rate was put forward,and the relationship between slippage velocity and water holding rate was analyzed.In the fourth chapter,based on the analysis of the experimental data,the interpretation plate of the production profile of the dual-frequency microwave water holdup instrument was produced,and the correction method was proposed for the effect of the salinity.The proposed logging method was used to process the actual logging data and achieved good results.The study of this paper shows that In the high-frequency and low-frequency ranges,there is a frequency band with a better linear relationship between phase difference and permittivity.The higher the operating frequency of instrument,the less effect the degree of salinity has on the instrument response count rate.When the salinity is small,the change of salinity has a great influence on the count rate.With the increase of salinity to a certain value,the effect of salinity changes on the count rate remains basically unchanged.When the moisture content is high,the instrument's high frequency operation mode is better than the low frequency operation mode.The interpretation of the actual logging data using the interpretation plate has achieved good results,illustrates the feasibility of the interpretation method,and also shows the reliability of the dual-frequency microwave water holdup instrument in the water content measurement.