摘要：In order to improve oil recovery,more and more oil fields use horizontal wells for oil and gas development.Compared with vertical wells,horizontal wells have many advantages,and can produce more oil and gas under the premise of the same input.However,fluid distribution and flow patterns in horizontal wells are more complicated than in vertical wells.In this paper,we use the physical experiment system to study the flow characteristics of oil-water two-phase flow in horizontal wells and near-horizontal wells.In this oil-water two-phase flow experiment,the latest horizontal well flow imaging logging tool MAPS was placed in the wellbore.MAPS instruments are mainly composed of CAT,RAT and SAT.CAT and RAT are holding rate meters,and SAT is a flow meter.In this paper,only the measurement data of the CAT meter was used.A total of 30 schemes were used in the experiment,with total flow rates of 100 m3/day,300 m3/day,and 600 m3/day,and water cuts of 20%,40%,60%,80%,and 90%,and well inclination angle of 90 degrees and 85 degrees,respectively.After the experiment,we classified the flow patterns of the photos taken in the experiment.It is found that when the total flow rate is small,the flow pattern of the oil-water two-phase flow in horizontal wells and near-horizontal wells is stratified flow,and when the total flow rate is large,it becomes a dispersed flow.In addition,we also analyzed the water holding capacity based on the response of the CAT instrument.
关键词：Horizontal well;Oil and gas development;Physical experiment;Imaging logging;Oil-water two-phase fluid
