Introduction to Offshore Pipelines and Risers by Jaeyoung Lee, P.E.

By Jaeyoung Lee, P.E.

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625” and a single reel can hold small size tubing lengths in excess of 30,000 ft. The world‟s longest continuously milled CT string is 32,800 ft. 75” diameter. CT‟s yield strengths range from 55 ksi to 120 ksi [8]. CT has been developed for well service and workover and expanded the applications to drilling and completion. To perform remedial work on a live well, three components are required:  CT string: a continuous conduit capable of being inserted into the wellbore  Injector head: a means of running CT string into wellbore while under pressure Stripper or pack-off: a device providing dynamic seal around the CT string  Some benefits of CT applications are: safe and efficient live well intervention, rapid mobilization and rig-up resulting in less production downtime, and reduced crew/personnel requirements, etc.

2. 4 bar Cl No < 3% < 5% Clad Pipe Clad pipe is a combination of low carbon steel (outer pipe) and CRA (inner pipe). This pipe reduces material cost by using a thin wall CRA pipe at inner pipe wall surface to resist internal corrosion. And the carbon steel outer pipe wall provides structural integrity. Special caution should be addressed during clad pipe welding to the low carbon steel pipe, since hydrogen induced cracking (HIC) can occur by dissimilar material welding process. 4 Composite Pipe A carbon-fiber or graphite material for small size pipe in low pressure application has been developed for mostly topside piping and onshore pipeline.

2 API-5L PSL 1 vs. 5% elongation occurs on the pipe, per API-5L. 1. 2% Elastic strain In elastic region, when the load is removed, the pipe tends to go back to its origin. If the load exceeds the elastic limit, the pipe does not go back to its origin when the load is removed. Instead, the stress reduces the same rate (slope) as the elastic modulus and reaches a certain strain at zero stress, called a residual strain. - 48 Line pipe is usually specified by Nominal Pipe Size (NPS) and schedule (SCH).

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