SY/T 0544-2024 Internal coating for petroleum drill pipes English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 0544-2024
Replaces SY/T 0544-2016
Internal coating for petroleum drill pipes
石油钻杆内涂层
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Coating Structure and Classification
4.1 Coating Structure
4.2 Coating Classification
5 Technical Requirements
6 Process Requirements
6.1 Internal Surface Pre-treatment
6.2 Application of Primer and Topcoat
6.3 Rework
7 Inspection and Testing
7.1 Incoming Inspection of Drilling Pipes
7.2 Coating Material Inspection
7.3 Surface Pre-treatment Inspection
7.4 Inspection During Coating Process
7.5 Factory Inspection
7.6 Type Testing
8 Marking, Packaging, Storage, Handling, Transportation and Protection
8.1 Paint Marking
8.2 Packaging
8.3 Storage, Handling, Transportation
8.4 Protection
9 Safety, Hygiene and Environmental Protection
10 Quality Certification Documents
Appendix A (Normative) Test Method for Adhesion of Internal Coating for Drilling Pipes
Appendix B (Normative) Method for Determining Thickness of Drilling Pipe Coating
Appendix C (Normative) Evaluation Method for High Temperature and High Pressure Resistance of Internal Coating for Drilling Pipes
Appendix D (Normative) Evaluation Method for Bending Resistance of Internal Coating for Drilling Pipes
Appendix E (Normative) Evaluation Method for Wear Resistance of Internal Coating for Drilling Pipes
Appendix F (Normative) Detection Method for Holidays in Internal Coating for Drilling Pipes
Bibliography
Internal Coating for Oil Drilling Pipes
1 Scope
This document specifies the coating structure and classification, technical requirements, process requirements, inspection and testing, marking, packaging, storage, handling, transportation and protection, safety, hygiene and environmental protection, and quality certification documents for internal coatings of drilling pipes.
This document applies to the application and inspection of organic internal coatings for drilling pipes used in oil and natural gas drilling.
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 1727 General method for preparation of paint film
GB/T 1766-2008 Paints and varnishes — Rating schemes for degradation of coatings
GB/T 2478 Ordinary abrasives — Brown fused alumina
GB/T 5330-2003 Industrial wire screens — Technical requirements and testing
GB 6514 Safety code for painting — Safety, ventilation and air clean-up for painting process
GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings
GB 12348 Emission standard for industrial enterprises noise at boundary
GB/T 13288.5 Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 5: Replica tape method for the determination of the surface profile
GB/T 29166 Petroleum and natural gas industries — Steel drill pipe
GBZ 1 Hygienic standards for the design of industrial enterprises
SY/T 4113.7 Test methods for properties of pipeline anti-corrosion coatings — Part 7: Thickness test
SY/T 5198 Thread compound for drilling tools
SY/T 5369 Management and use of petroleum drilling tools — Kelly, drill pipe and drill collar
SY/T 5561 Drill pipe
ISO 11961 Petroleum and natural gas industries — Steel drill pipe
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
liquid coating
A coating where both the primer and topcoat are liquid coatings.
3.2
powder coating
A coating where the topcoat is powder coating, and the primer is either liquid coating or powder coating.
3.3
holiday
Any discontinuity or bare spot on the entire coated internal surface of the drilling pipe.
3.4
appearance
Visual characteristics of a surface.
Note: Color, gloss, distinctness of image (DOI), haze, surface structure, texture, orange peel, etc., fall within the scope of this term.
[SOURCE: GB/T 5206-2015, 2.23]
3.5
surface profile
The distance between the peak line and the valley line of the contour after blasting.
3.6
adhesion
The phenomenon of attachment at the interface between a solid surface and another material through molecular forces.
Note: Adhesion should not be confused with cohesion.
[SOURCE: GB/T 5206-2015, 2.7]
4 Coating Structure and Classification
4.1 Coating Structure
The coating consists of a primer and a topcoat.
4.2 Coating Classification
Coatings are classified into liquid coatings and powder coatings.
5 Technical Requirements
5.1 The technical requirements for the internal coating of new drilling pipes shall comply with the provisions of Table 1.
The technical requirements for the internal coating of used drilling pipes shall be negotiated between the coating factory and the purchaser.
5.2 The internal surface of the pipe body and the internal surface of the external thread connection of drilling pipes conforming to GB/T 29166, SY/T 5561, and ISO 11961 shall be fully coated. The coating scope for non-standard drilling pipes and used drilling pipes shall be negotiated between the purchaser and the coating factory.
6 Process Requirements
6.1 Internal Surface Pre-treatment
6.1.1 Before coating, attached materials such as grease and dirt on the threads and internal surface of the pipe body shall be thoroughly cleaned.
6.1.2 Abrasive blasting for rust removal shall be carried out under conditions of room temperature and relative air humidity less than 90%. The internal surface temperature of the drilling pipe shall not be lower than the dew point temperature +3°C. Relative humidity shall be measured at least once per shift, and every 2 hours when the climate changes abruptly.
6.1.3 To ensure appropriate surface profile and cleanliness, brown fused alumina should be used as the abrasive. Brown fused alumina shall comply with the provisions of GB/T 2478.
6.1.4 After blasting treatment, dust and abrasive adhering to the internal surface of the drilling pipe shall be cleaned using high-pressure air.
6.1.5 The rust removal grade shall reach the Sa3 grade requirement specified in GB/T 8923.1-2011, and the surface profile shall reach 25 μm to 76 μm. The internal surface of the drilling pipe shall have no visible defects such as cracks, pits, or burrs on the pipe body.
6.2 Application of Primer and Topcoat
6.2.1 To prevent oxidation, moisture absorption, rusting, or secondary contamination of the internal surface of the drilling pipe before coating, the interval time between blasting treatment and primer application shall comply with the requirements in Table 2.
6.2.2 The application of primer and topcoat should be carried out in an environment with relative humidity less than 90%, temperature between 10°C and 35°C, and good ventilation. When relative humidity exceeds 90%, operations shall be stopped. Relative humidity shall be measured at least once per shift, and every 2 hours when the climate changes abruptly.
