SY/T 7826-2024 Dual-wall drill pipe English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 7826-2024
Dual-wall drill pipe
双壁钻杆
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Foreword
1 Scope
2 Normative References
3 Terms, Definitions, Symbols, and Abbreviations
3.1 Terms and Definitions
3.2 Symbols and Abbreviations
4 Structure and Dimensions
4.1 Structure
4.2 Dimensions
5 Manufacturing Process
5.1 General Requirements
5.2 Processes Requiring Qualification
5.3 Welding Procedure Qualification
5.4 Welding and Post-Weld Heat Treatment
5.5 Machining of Welds
5.6 Internal Coating
5.7 External Coating
5.8 Threads
5.9 Thread Protection
5.10 Traceability
6 Performance Requirements
6.1 Chemical Composition
6.2 Tensile Properties
6.3 Impact Properties
6.4 Hardness
6.5 Transverse Side Bend Properties
6.6 Sealing Performance
6.7 Defects
7 Inspection and Testing
7.1 Calibration of Inspection and Testing Equipment
7.2 Frequency of Inspection and Testing
7.3 Visual Inspection
7.4 Dimensional Inspection
7.5 Material Property Testing
7.6 Sealing Performance Testing
7.7 Defect Detection
7.8 Purchaser's Inspection
8 Marking
8.1 General
8.2 Marking
8.3 Traceability Marking
8.4 Marking on the Outer Pipe Body
8.5 Marking on the Outer Pipe Joints
9 Documentation
9.1 Standard Documentation
9.2 Electronic Data Interchange
9.3 Record Keeping
10 Packaging and Transportation
10.1 Packaging
10.2 Transportation
Appendix A (Normative) Purchaser's Inspection
Bibliography
Dual-Wall Drill Pipe
1 Scope
This document specifies the structure and dimensions, manufacturing process, performance requirements, testing and inspection, marking, documentation, packaging, and transportation of dual-wall drill pipe.
This document applies to the manufacture and inspection of dual-wall drill pipe used in drilling operations in the petroleum and natural gas industry.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.59 Iron and steel — Determination of phosphorus content — Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229 Metallic materials — Charpy pendulum impact test method
GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method
GB/T 8162 Seamless steel tubes for structural purposes
GB/T 9253 Petroleum and natural gas industries — Threading, gauging and thread inspection of casing, tubing and line pipe threads
GB/T 9445 Non-destructive testing — Qualification and certification of NDT personnel
GB/T 22512.2 Petroleum and natural gas industries — Rotary drilling equipment — Part 2: Threading and gauging of rotary shouldered thread connections
GB/T 29166 Petroleum and natural gas industries — Steel drill pipe
NB/T 47013.3 Non-destructive testing of pressure equipments — Part 3: Ultrasonic testing
NB/T 47013.4 Non-destructive testing of pressure equipments — Part 4: Magnetic particle testing
SY/T 0544 Internal coating for oil drill pipe
SY/T 5198 Thread compound for drilling tools
SY/T 5369 Management and use of petroleum drilling tools — Kelly, drill pipe and drill collar
ISO 7500-1 Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 9513 Metallic materials — Calibration of extensometer systems used in uniaxial testing
ISO/TR 9769 Steel and iron — Review of available methods of analysis
3 Terms, Definitions, Symbols, and Abbreviations
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 29166 and the following apply.
3.1.1
dual-wall drill pipe
Drill pipe composed of two concentric inner and outer tubular components, providing relatively independent inner and outer drilling fluid flow paths.
Note: Also known as dual-layer drill pipe.
3.1.2
outer pipe
The outer tubular component that transmits working loads such as tension, compression, and torsion.
3.1.3
inner pipe
The concentric tubular component fixed inside the outer pipe.
3.1.4
top joint of inner pipe
The inner pipe connecting joint assembled at the internally threaded connection of the outer pipe, providing a fluid flow path.
3.1.5
bottom joint of inner pipe
The inner pipe connecting joint assembled at the externally threaded connection of the outer pipe, providing a fluid flow path.
3.1.6
torsion-strength ratio
The ratio of the torsional strength of the outer pipe connection joint to the torsional strength of the pipe body.
3.1.7
fluid channel equivalent diameter
The equivalent diameter when the flow area of the fluid channel is converted to a circular area.
3.1.8
lot
A specified quantity of products manufactured under conditions considered uniform for inspection attributes.
3.1.9
drill pipe elements
The individual components that constitute the drill pipe.
3.2 Symbols and Abbreviations
3.2.1 Symbols
The following symbols apply to this document.
A — Elongation;
Aop — Cross-sectional area of the outer pipe body, in square millimeters (mm²);
Aow,min — Minimum cross-sectional area of the outer pipe weld zone, in square millimeters (mm²);
AI — Total flow area of the inner pipe joint, in square millimeters (mm²);
Dip — Outer diameter of the inner pipe body, in millimeters (mm);
Doe — Outer diameter of the drill pipe weld neck after machining, in millimeters (mm);
Doj — Outer diameter of the outer pipe joint (external thread and internal thread of outer pipe), in millimeters (mm);
Dop — Outer diameter of the outer pipe body, in millimeters (mm);
Dote,min — Minimum allowable outer diameter of the outer pipe weld zone specified by the drill pipe manufacturer, in millimeters (mm);
die — Equivalent diameter of the inner pipe joint flow channel, in millimeters (mm);
dij — Inner diameter of the inner pipe top (bottom) joint, in millimeters (mm);
dip — Inner diameter of the inner pipe body, in millimeters (mm);
doe — Inner diameter of the drill pipe weld neck after machining, in millimeters (mm);
doj — Inner diameter of the externally threaded connection of the outer pipe, in millimeters (mm);
dop — Inner diameter of the outer pipe body, in millimeters (mm);
dote,max — Maximum allowable inner diameter of the outer pipe weld zone specified by the drill pipe manufacturer, in millimeters (mm);
Lb — Large slip length of the internally threaded connection of the outer pipe, in millimeters (mm);
Lp — Large slip length of the externally threaded connection of the outer pipe, in millimeters (mm);
Ts — Tensile strength, in megapascals (MPa);
ti — Wall thickness of the outer pipe body, in millimeters (mm);
to — Wall thickness of the outer pipe body, in millimeters (mm);
Wdp — Approximate mass of the drill pipe, in kilograms per meter (kg/m);
Ys — Yield strength, in megapascals (MPa);
Ysop,min — Specified minimum yield strength of the outer pipe body, in megapascals (MPa);
