Coiled tubing: Difference between revisions

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* Total length
* Total length


A spool of CT may be manufactured from one heat or a combination of heats that are selected according to a documented procedure provided by the manufacturer. However, the steel used to fabricate the string must have a uniform material yield strength throughout. The manufacturer should maintain traceability of the CT product throughout the manufacturing and testing process. The requirements of the purchaser often include traceability to the heat of steel.  
A spool of CT may be manufactured from one heat or a combination of heats that are selected according to a documented procedure provided by the manufacturer. However, the steel used to fabricate the string must have a uniform material [[Glossary:Yield strength|yield strength]] throughout. The manufacturer should maintain traceability of the CT product throughout the manufacturing and testing process. The requirements of the purchaser often include traceability to the heat of steel.  


===Tapered wall thickness string design===
===Tapered wall thickness string design===
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Continuously-tapered skelp is milled having a specified wall thickness at the leading end of the steel skelp, progressively increasing in wall thickness along the length of the skelp to a second specified wall thickness at the trailing end of the skelp.  
Continuously-tapered skelp is milled having a specified wall thickness at the leading end of the steel skelp, progressively increasing in wall thickness along the length of the skelp to a second specified wall thickness at the trailing end of the skelp.  


The construction of tapered CT strings conforms to the previously described manufacturing processes. Although tube segments of different wall thickness can be assembled within the string construction, it is critical that all of the segments have a uniform material yield strength. The change in specified wall thickness, ''t'', between the adjoining CT segments should not exceed the following specified values:  
The construction of tapered CT strings conforms to the previously described manufacturing processes. Although tube segments of different wall thickness can be assembled within the string construction, it is critical that all of the segments have a uniform material [[Glossary:Yield strength|yield strength]] . The change in specified wall thickness, ''t'', between the adjoining CT segments should not exceed the following specified values:  
   
   
* 0.008 in. where the specified wall thickness of the thicker of the adjoining segments is less than 0.110 in.
* 0.008 in. where the specified wall thickness of the thicker of the adjoining segments is less than 0.110 in.
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