API RP 5C7:1996 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. 4.4.1 Yield Strength The yield strength of new coiled tubing is determined by either the tensile stress at which the strain in the gauge length exhibits a 0.2 percent offset, or the tensile stress required to produce an extension under load of 0.5 percent. 4.4.2 Tensile Strength The tensile strength is the tensile stress corresponding to the maximum load in a tensile test of the gauge section, and shall meet the manufacturer’s written specification or the requirements of Table 2, whichever is greater.
API RP 5C7:1996 pdf download
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