HOUSTON, TX (11/2/98) – Using the combined efforts of its Uncle John and Coflexip Stena Offshore’s Constructor, Cal Dive International (CDI) performed the complete abandonment of Tatham Offshore’s Seattle Slew subsea well and associated pipelines in Ewing Banks block 914.
The Uncle John, a dynamically positioned multi service vessel (DPMSV), was used to plug the well and recover the subsea tree for salvage.
Subsequently, the Constructor, a dynamically positioned diving support vessel (DPDSV), was brought in to conduct the recovery of two sets of tandem 3.5-inch diameter flowlines (140,000 feet total) from the subsea location to the platform host at Ewing Banks 826.
The flowline abandonment sequence was accomplished by spooling each pair of flowlines onto a set of 8.6-meter diameter reels on the vessel deck. The abandonment was completed in 945 feet of water. Also, a temporarily abandoned wellhead situated in Ewing Banks 915 was permanently abandoned.
Decommissioning operations were conducted dockside in Lake Charles, La., where the lines were spooled off and hopper barges handled the waste content of the lines. Special handling was required because the second set of lines, previously decommissioned, had paraffin blockage.
CDI is a leading provider of innovative offshore construction, maintenance and decommissioning services to the Gulf of Mexico oil and gas industry.
FOR MORE INFORMATION: Lou Tapscott (281) 618-0400