ISO/TS 12835:2022
(Main)Qualification of casing connections for thermal wells
Qualification of casing connections for thermal wells
This document provides procedures for assessment of casing connections for those field applications in which the operating temperatures cyclically vary between minimum values appreciably below 180 °C and maximum values that range from 180 °C to 350 °C or above, and in which the primary axial loading on the casing-connection system is strain-based and driven by constrained thermal expansion and leads to a stress state that exceeds the casing-connection system's yield envelope. NOTE This document can be considered complementary to ISO 13679 (and its core content per API Specification 5C5), which applies to classic elastic-design applications. This document contains an evaluation procedure for a candidate connection comprising of uniquely defined pin, box and interfacial components. The evaluation procedure includes: — Material property tests to assess relevant properties of the candidate connection pin and box components; — Analytical tasks to determine configuration of connection samples for physical tests, which are chosen based on worst-case combinations of the connection geometry and material properties; — Full-scale testing tasks to measure the candidate connection galling resistance, structural integrity and sealability under loading representative of connection assembly and thermal well service. This document does not address impacts of external pressure, incomplete lateral pipe support, rotational fatigue, formation-induced shear, or environmentally-induced corrosion or cracking. Clause 6 describes fundamental assumptions adopted in this document.
Qualification des raccordements de boîtiers pour les puits thermométriques
General Information
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Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 12835
First edition
2022-03
Qualification of casing connections for
thermal wells
Qualification des raccordements de boîtiers pour les puits
thermométriques
Reference number
ISO/TS 12835:2022(E)
© ISO 2022
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ISO/TS 12835:2022(E)
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ISO/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 — data categories. 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
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ISO/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 Task overview. 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 . 47
12.3.4 Worst-case geometry configurations .48
12.3.5 Seal taper analysis .50
12.3.6 Impacts of material property variations . 51
12.3.7 Make-up torque for sealability tests .54
12.3.8 Test versus production specimens .56
13 Specimen procurement .56
13.1 Task overview.56
13.2 Specimen pipe procurement . 57
13.3 Material property verification . 57
13.3.1 Task description . 57
13.3.2 Specimens for tensile verification tests . 57
13.3.3 Scope of tensile verification tests.58
13.3.4 Coefficient of thermal expansion verification test . . 59
13.4 Test specimen machining and gauging .60
13.4.1 General requirements .60
13.4.2 Specimen naming convention .60
13.4.3 Specimen length and length-reference requirements . 61
13.4.4 Geometrical configurations . 62
13.4.5 Mother pipe for specimens . 62
13.4.6 Specimen machining tolerances .63
13.5 Markings .65
13.6 Specimen geometry verification .65
13.6.1 Gauging inspection scope .65
13.6.2 Inspection extent – example cases .66
13.6.3 Geometry inspection guidelines .66
13.7 Procurement and quality control of connection interfacial components . 67
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ISO/TS 12835:2022(E)
13.8 Specimen handling and storage . 67
13.8.1 Handling recommendations . 67
13.8.2 Treatment of damaged specimens .68
14 Full-scale physical tests and supplementary analyses .68
14.1 Task overview.68
14.2 Full-scale tests - general requirements . 69
14.2.1 Ambient temperature at test site . 69
14.2.2 Calibration of instrumentation. 69
14.2.3 Disabling of secondary seals . 70
14.2.4 Seepage measurement and rate definitions . 70
14.2.5 Load application rates .72
14.2.6 Excluded connections .72
14.3 Galling resistance test .73
14.3.1 Task description .73
14.3.2 Rationale and objectives .74
14.3.3 Make-break specimens .74
14.3.4 Scope of galling resistance test .74
14.3.5 Set-up and instrumentation . 75
14.3.6 Test procedure. 76
14.3.7 Performance assessment .77
14.3.8 Reporting . 78
14.4 Thermal cycle test .78
14.4.1 Task description . 78
14.4.2 Rationale and objectives . 78
14.4.3 Thermal cycle specimens . 79
14.4.4 Scope of thermal cycle test . 79
14.4.5 Mechanical strain compensations .82
14.4.6 Set-up and instrumentation .85
14.4.7 Test procedure. 91
14.4.8 Performance assessment .96
14.4.9 Selection of cycled specimens for bend test and limit-strain test .97
14.4.10 Reporting .97
14.5 Bending evaluation .97
14.6 Limit-strain test .98
14.6.1 Task description .98
14.6.2 Rationale and objectives .98
14.6.3 Limit-strain specimens .99
14.6.4 Mandatory test description .99
14.6.5 Set-up and instrumentation . 101
14.6.6 Mandatory test procedure .103
14.6.7 Performance assessment .108
14.6.8 Reporting .108
14.7 As-tested configuration analysis .108
15 Evaluation and inspection reports . 108
15.1 Reporting deliverables .108
15.2 Reporting scope and contents .109
15.3 Reporting templates .113
Annex A (informative) FEA modelling guidelines .114
Annex B (informative) Derivations of formulae - Strain compensation factors .124
Annex C (informative) Program role assignments and responsibilities .133
Annex D (informative) Optional program selections, tasks, and procedures . 140
Bibliography .163
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ISO/TS 12835:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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electrotechnical standardization.
The procedures used to develop this document and those intended
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