Experimental Study On Fils In Horizontal Well

With the progress of science and technology,imaging observation technology has become more and more advanced.The traditional measurement technology uses the average linear measurement method in local space,and it is impossible to obtain the spatial distribution information of the fluid medium,and it is difficult to provide the details of the flow profile in the oil well.This paper mainly describes the application of the newly developed fluid imaging logging system in horizontal wells.The flow imaging logging system can detect the flow in the well in real time,obtain the two-dimensional or three-dimensional distribution information of multiphase fluids,and give the phase distribution profile through processing.To realize flow pattern identification,to determine phase rate and phase speed,to provide an accurate and reliable basis for the evaluation of production status and reservoir dynamic analysis of all kinds of oil wells.The essence of imaging measurement is to use a physical realizable system to complete the transformation and inverse transformation of a certain characteristic distribution of the subject field.Fundamentally speaking,the flow imaging measurement and the medical imaging detection are the same,but the measurement object,the measurement purpose and the operating environment are different.The basic content of flow imaging logging consists of three parts: First,using a specially designed sensor space array,using projection measurements in different directions to obtain information on the distribution of certain characteristics in the well fluid.At present,such measurement methods as capacitance method,conductivity method and electromagnetic method can be used.Second,using information processing technology and image reconstruction algorithm,real-time reconstruction and display of the flow section of the image;Thirdly,by analyzing and interpreting the reconstruction image information,the distribution state of well fluid and its flow change characteristics are obtained.Flow imaging logging is a nonlinear measurement of the dynamics of non-uniform media.Through projection scanning and inversion of multi-phase fluid information in oil and gas wells,real-time imaging shows fluid distribution and flow conditions.The electrical conductivity and capacitance instruments developed abroad use conductive probes or capacitive elements to form array measurement probes.Using the difference between the electrical conductivity and dielectric characteristics of oil and water,respectively,the fluids in the well are identified.The measurement of the flow section is limited to individual points.The application effect has been seen in horizontal wells,but the amount of data and resolution measured by the projection of field information can not meet the imaging requirements.The differential action of gravity results in the separation of heavy and light phases in horizontal Wells and near horizontal Wells,and it is easy to have stratified flow.The flow state of multiphase flow is different from that of vertical Wells.Therefore,it is necessary to study the multiphase flow pattern of horizontal well to study the optimization interpretation technology of well logging multiphase flow in horizontal Wells.Because the experiment lasted three months,the time was longer,the viscosity difference caused by temperature was not considered;The data collection relies on the visual and visual digital images,resulting in insufficient accuracy.Based on the investigation of the existing measuring instruments,it is found that the array capacitance meter is relatively suitable for the measurement of multiphase flow in horizontal Wells.Fluid imaging logging system based on the latest validation,this paper based on the analysis of the instrument measuring principle,on the basis of the interpretation of the existing algorithms are introduced,and points out the structure characteristic of the instrument,the matters which should be paid attention to in practical use and interpretation to solve the problem of multiphase flow put forward two new holdup calculation method and a new section imaging algorithm.