TECHNICAL ISO/TS SPECIFICATION 12835 First edition 2022-03 Qualification of casing connections for thermal wells Qualification des raccordements de boitiers pour les puits thermometriques Reference number IS0/TS12835:2022(E) ISO @IS02022 IS0/TS 12835:2022(E) COPYRIGHTPROTECTED DOCUMENT @ISO2022 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved IS0/TS 12835:2022(E) Contents Page Foreword vi Introduction ..vii 1 Scope. 1 2 Normative references .1 3 Terms and definitions. 1 4 Abbreviated terms and symbols .5 4.1 Abbreviated terms .5 4.2 Symbols.. 6 5 Program overview. 7 5.1 Illustrations of selected definitions. 7 5.2 Program flowchart. 7 6 Overview and fundamental assumptions .8 6.1 General 8 6.2 Main features. 8 6.2.1 Purpose 8 6.2.2 Applicability to service conditions .9 6.2.3 Rationale for development. 9 6.2.4 Subject of evaluation. .9 6.2.5 Application severity levels 9 6.3 Assessment philosophy and principles 10 6.3.1 Fundamental principles. 10 6.3.2 Conservative evaluation procedure 11 6.3.3 Mandatory and optional tasks. 11 6.3.4 Use of analysis and physical testing 12 6.3.5 Performance measures. 12 6.3.6 Assessment criteria 12 6.3.7 Task outcomes - datacategories 13 6.3.8 Prior evaluation data 13 6.3.9 Treatment of confidential design information 13 6.3.10 Interpretation of evaluation results 14 6.3.11 Avoiding perception of conflict of interest 14 6.4 Evaluation variables 14 6.4.1 Connection loading. 14 6.4.2 Impacts of contributing variables 14 6.4.3 Pin-box interferences and tapers 16 6.4.4 Material yield strength .16 6.5 Evaluation procedure 17 6.5.1 Safety standards. 17 6.5.2 Seepage assessment - random variations 17 6.5.3 Seepage rate thresholds. 17 6.5.4 Seal isolation. 18 6.5.5 Dope entrapment 18 6.5.6 Thermal cycle test - bake-out and hold durations. 18 6.5.7 Pressure and temperature loading in thermal cycle test and analysis 19 6.5.8 Dependence of material strength on temperature. 19 6.6 Scope of reporting 20 7 Program roles and proprietary design information .20 7.1 Program execution roles 20 7.2 Proprietary connection design information 20 8 Conformance requirements 21 8.1 Conformant evaluation program. 21 @ IS0 2022 - All rights reserved ii IS0/TS 12835:2022(E) 8.2 Program non-conformances. .21 8.3 Performance acceptance ..22 8.4 Conformance of results from previous evaluations .22 8.5 Use of data from previous evaluations. .22 8.6 Conformance to lower ASLs.. .23 9 Application severity levels 23 9.1 Thermal well load path .23 9.2 Temperature as controlling parameter. 25 9.3 Specifications for application severity levels 26 9.4 Selection of application severity level .27 10 Program blocks and tasks. .27 10.1 Evaluation procedure overview. .27 10.2 Critical path tasks..... .31 11 Program specifications. .32 11.1 Task overview. .32 11.2 Identification of program roles. .32 11.3 Identification of candidate connection .33 11.4 Program options. .34 11.5 Data from prior evaluations .35 12 Determination of biased test population .35 12.1 Taskoverview. 35 12.2 Initial material property characterization .36 12.2.1 Task description, definitions, methods. .36 12.2.2 Testing conditions and scope. .37 12.2.3 Procedure for tensile tests. .39 12.2.4 Interpretation and processing of tensile test results ..40 12.3 Specimen configuration analysis ..45 12.3.1 Task description.. ..45 12.3.2 Modelling and reporting requirements ..46 12.3.3 Nominal reference case