API RP 5C7:1996(R2007) pdf download.Recommended Practice for Coiled Tubing Operations in Oil and Gas Well Services
1.5 DOCUMENT ORGANIZATION
Material presented in this recommended practice is orga- nized into five sections, including these general sections (1 through 4). Section 5 covers design, care, and handling of coiled tub- ing as manufactured and prepared for delivery to the pur- chaser. The current processes of coiled tubing manufacture and high-strength, low-alloy steel materials used are reviewed. Mechanical and performance properties for new coiled tubing are also covered, along with a review of tapered string design and construction. Section 5 concludes with a review of the nondestructive inspection practices and tests commonly employed by coiled tubing manufacturers. Section 6 addresses the serviceability issues related to performing coiled tubing operations, and offers recom- mended guidelines for coiled tube maintenance, record keeping, and derating. This includes a discussion of the unique characteristics of coiled tubing， such as fatigue, fatigue derating methods, changes in tube diameter resulting from bending while in service, derated collapse pressures due to ovality, and effects of corrosion and cracking of coiled tubing. This section concludes with a general discus- sion of the performance of welds in the coiled tubing string. Section 7 addresses surface and downhole equipment used during coiled tubing operations. Equipment addressed includes coiled tubing injectors, tubing reels, hydraulic power supply (prime mover), tubing guide arches, well con- trol components, riser stacks, high-pressure surface piping, and a review of tubing connectors for attaching tools to the coiled tubing. Section 8 is a discussion of operational contingencies and suggested guidelines for performing coiled tubing services. Topics covered include pre-job preparation, rig up, entering the well, and potential operating concerns which may be experienced when performing various downhole services.
4.4 MECHANICAL PROPERTIES
Mechanical properties of coiled tubing should be provided for each spool of coiled tubing by the manufacturer. The mechanical properties reported are for the tubing prior to spooling or any service-induced cold work. Spooling and service conditions can alter the degree of cold work and hence the actual mechanical properties of a coiled tubing string. The minimum tensile properties for commonly used grades are shown in Table 2.
4.4.3 Ductility
Ductility of coiled tubing is the percent elongation of a 2-inch gauge length in a tensile test. The minimum elonga- tion required for each grade, weight, size (outside diameter), and wall thickness shall be in accordance with the manufac- turer’ s written specification.
API RP 5C7:1996(R2007) pdf download
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