{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T19:03:15Z","timestamp":1776452595960,"version":"3.51.2"},"reference-count":20,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2016,10,14]],"date-time":"2016-10-14T00:00:00Z","timestamp":1476403200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>First, the measuring principle, the weight function, and the magnetic field of the novel downhole inserted electromagnetic flowmeter (EMF) are described. Second, the basic design of the EMF is described. Third, the dynamic experiments of two EMFs in oil-water two-phase flow are carried out. The experimental errors are analyzed in detail. The experimental results show that the maximum absolute value of the full-scale errors is better than 5%, the total flowrate is 5\u201360 m3\/d, and the water-cut is higher than 60%. The maximum absolute value of the full-scale errors is better than 7%, the total flowrate is 2\u201360 m3\/d, and the water-cut is higher than 70%. Finally, onsite experiments in high-water-cut oil-producing wells are conducted, and the possible reasons for the errors in the onsite experiments are analyzed. It is found that the EMF can provide an effective technology for measuring downhole oil-water two-phase flow.<\/jats:p>","DOI":"10.3390\/s16101703","type":"journal-article","created":{"date-parts":[[2016,10,14]],"date-time":"2016-10-14T09:40:29Z","timestamp":1476438029000},"page":"1703","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Novel Downhole Electromagnetic Flowmeter for Oil-Water Two-Phase Flow in High-Water-Cut Oil-Producing Wells"],"prefix":"10.3390","volume":"16","author":[{"given":"Yanjun","family":"Wang","sequence":"first","affiliation":[{"name":"Harbin Institute of Technology, School of Electrical Engineering and Automation, Harbin 150001, China"},{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Haoyu","family":"Li","sequence":"additional","affiliation":[{"name":"Harbin Institute of Technology, School of Electrical Engineering and Automation, Harbin 150001, China"}]},{"given":"Xingbin","family":"Liu","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Yuhui","family":"Zhang","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Ronghua","family":"Xie","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Chunhui","family":"Huang","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Jinhai","family":"Hu","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]},{"given":"Gang","family":"Deng","sequence":"additional","affiliation":[{"name":"Daqing Oilfield Limited Company, Daqing 163412, China"}]}],"member":"1968","published-online":{"date-parts":[[2016,10,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1080\/00986445.2014.970253","article-title":"Novel Four-Electrode Electromagnetic Flowmeter for the Measurement of Flowrate in Polymer-Injection Wells","volume":"203","author":"Liu","year":"2016","journal-title":"Chem. 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