Directionally drilled crossing constructed under river levee
Journal Article
·
· Pipeline and Gas Journal
OSTI ID:392257
- Land and Marine, Inc., Houston, TX (United States)
- Shell Oil Products Co., Houston, TX (United States)
Shell Pipe Line Corp. recently commenced construction of its 20-inch Delta Loop Pipeline Project in south Louisiana. This line will transport crude oil from Main Pass No. 69 to the existing Shell pump station at Nairn in Plaquemines Parish. NBH, Inc. of New Orleans is prime contractor for this project which involves offshore pipe lay, shallow water marsh lay and a 4,100-foot horizontal directional crossing of the Mississippi River at Nairn which was undertaken by Land and Marine, Inc. of Houston. For past directionally drilled crossings, the New Orleans district of the US Army Corps of Engineers has only allowed drilling operations inside its Mississippi River flood protection levees. No drilling has been undertaken beneath the levees out of concern that the drilling operations could in some way damage their structural integrity. Unfortunately, at this particular location, the drill profile could not be designed placing drilling equipment inside the levee and achieve sufficient burial depth for the installed pipeline. If not allowed to bore beneath the levee, significant additional costs would have been incurred in routing the pipeline to a more suitable location. This paper reviews the design of this drilling operation showing the locations and construction of relief wells and piezometers used to monitor the directional drilling.
- OSTI ID:
- 392257
- Journal Information:
- Pipeline and Gas Journal, Journal Name: Pipeline and Gas Journal Journal Issue: 6 Vol. 223; ISSN PLGJAT; ISSN 0032-0188
- Country of Publication:
- United States
- Language:
- English
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