J-Lay Pipeline Installation

J-Lay pipeline installation method is frequently used in deep water pipeline installation. The curvature of pipe line is similar to J shape (Figure 1) while the subsea pipeline is being installed. J-Lay method can handle a full range of pipeline size and it is particularly suitable for deep water pipeline installation up to 2,000 m (6,560 ft).  Furthermore, the J-Lay method can withstand higher underwater current and sea state than the S-Lay method.

The J-lay method puts less stress on the pipe line because the pipeline is installed in an almost vertical position. Whereas the S-lay method puts on more stress due to two curvatures at the sag bend and over-bend region. The pipeline is sent into water at a small angle reference to a vertical line and continues at a steep angle until a sag bend is formed.

Figure 1- J-Lay pipeline vessel

Figure 1- J-Lay pipeline vessel

This works very well in deep water environment where distance from a vessel to a touchdown point is quite far because sag bend is not too much. If the short distance from a vessel to a touchdown point.

This video demonstrates how J-Lay method works.

 

Example of a J-Lay Pipe Vessel

Saipem 7000 Lay Barge

J-Lay tower handles quadruple jointed pipe

Laid Blue Stream twin pipeline across Black Sea:

− Maximum water depth 2,150 m BMSL.

− Pipeline OD = 24”. WT 1.25”

Heavy lift cranes rated at 14,000 mT.

Saipem 7000 Lay Barge

References

James G. Speight, 2014. Handbook of Offshore Oil and Gas Operations. 1 Edition. Gulf Professional Publishing.

Trond Bendiksen, 2015. Commissioning of Offshore Oil and Gas Projects: The manager’s handbook. Edition. AuthorHouse.

Joseph A. Pratt, 1997. Offshore Pioneers: Brown & Root and the History of Offshore Oil and Gas. Edition. Gulf Professional Publishing.

Gazprom.com, (2012), Saipem 7000 Lay Barge [ONLINE]. Available at: http://www.gazprom.com/f/posts/14/420254/04881_005.jpg [Accessed 24 July 2016].

Related Post

Backreaming practice helps smoothen the well bore While you are sliding with a motor assembly, you may consider backreaming one time at least. The reason is that you will smoothen the well bore and it...
Bottom Hole Pressure with Constant Surface Pressur... This is another example demonstrating how bottom hole pressure will be when you maintain constant surface pressure and let gas bubble migrating up. ...
You Can Travel To North Sea’s Oil Platform a... You can imagine that you can travel to the Troll A platform in the North Sea without working in the oil and gas industry.  It cost you quite a lot of ...
American Oilfield History Photos This is good to see the American oilfield in the old day. Drill crew The surveyor East Texas Oil Fields Damaged Oil Derrick Oi...
Share the joy
  • 102
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
    102
    Shares
Tagged , , , , , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.