ISO/TS TECHNICAL SPECIFICATION 21354 First edition 2020-11 Measurement of multiphase fluid flow Reference number IS0/TS 21354:2020(E) ISO @ISO2020 IS0/TS 21354:2020(E) COPYRIGHT PROTECTED DOCUMENT @ iS02020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2020 - All rights reserved IS0/TS 21354:2020(E) Contents Page Foreword .vi Introduction. ..vii 1 Scope. .1 2 Normative references. ..1 3 Terms and definitions. 1 3.1 Terms related to multiphase flow metering 1 3.2 Terms related to metrology... 7 4 Symbols and subscripts. 10 4.1 Symbols. 10 4.2 Colours and symbols used in schematic drawings .10 5 Multiphase flow ..11 5.1 General. 11 5.2 Multiphase flow regime maps. 12 5.2.1 General. 12 5.2.2 Verticalflows 12 5.2.3 Horizontal flows .13 5.3 Slip effects .14 5.4 Classification of multiphase flows 15 Aims of multiphase flow measurement ..16 6.1 General .16 6.2 Individual-well surveillance or monitoring 18 6.2.1 General. 18 6.2.2 Production optimization .19 6.2.3 Flow assurance. 19 6.3 Well testing. 19 6.3.1 General. 19 6.3.2 Conventional well testing 20 6.3.3 Well testing by MPFMs.. 21 6.4 Production allocation metering. 23 6.5 Fiscal or custody transfer measurement 26 6.6 Summary of advantages and disadvantages of MPFMs 26 7 Production envelope and installation design guidelines 26 7.1 General 26 7.2 Production envelope .27 7.2.1 Plotting the production envelope in the two-phase flow map 27 7.2.2 Plotting the production envelope in the composition map. 28 7.3 MPFM measuring envelope. 29 7.3.1 Plotting the MPFM measuring envelope in the two-phase flow map. 29 7.3.2 Plotting the MPFM measuring envelope in the composition map 30 7.4 Using the flow maps during testing . 31 7.5 Cumulative performance plot. .33 7.6 Other considerations .34 8 Performance specification .37 8.1 General 37 8.2 Technical description 38 8.3 Specification of individual sensors and primary devices. 38 8.4 Specification of output data and formats. 38 8.5 Measuring range, rated operating conditions and limiting conditions 39 8.6 Measurement uncertainty. 39 8.6.1 General. 39 8.6.2 Measurement uncertainty evaluation of MPFMs 40 @ IS0 2020 - All rights reserved iii IS0/TS21354:2020(E) 8.6.3 Influence quantities and sensitivity coefficients. .40 8.6.4 Repeatability .41 8.6.5 Stability and frequency response ..41 8.7 Guideline on MPFM performance specification ..41 8.7.1 General. .41 8.7.2 Technical descriptions ..42 8.7.3 Specification of input data ..42 8.7.4 Specification of output data ..42 8.7.5 Rated operating conditions and limiting conditions ..43 8.7.6 Measurement uncertainty ..44 8.7.7 Two-phase flow map. .46 8.7.8 Composition map .46 9 Testing, calibration and adjustment .46 9.1 General .46 9.2 Factory acceptance testing (FAT) ..47 9.3 Calibration and test of MPFMs. ..48 9.3.1 General. ..48 9.3.2 Performance verification in static conditions .48 9.3.3 Performance verification in dynamic conditions. .49 9.3.4 Factory test. .51 9.3.5 Test facility. .51 9.3.6 In situtest .53 9.3.7 Further information on performance testing .55 9.3.8 Test report .58 9.4 Adjustment of MPFMs. .60 9.4.1 General. .60 9.4.2 Adjustment based on static configuration. .60 9.4.3 Adjustment based on performance verification in dynamic conditions .60 9.5 Blind tests 61 9.5.1 Scope and objective of MPFM blind test .61 9.5.2 Organization and implementation. .61 9.5.3 Multiphase flow loop.. .61 9.5.4 Test matrix .62 9.5.5 Inform