FISHING JUNK BASKET AND RETRIEVING BRIDGE PLUG FOR NEXEN PETROLEUM UK LTD.

Well Stroker for MECHANICAL SOLUTIONS

Background

Nexen Petroleum UK Ltd. was carrying out the completion of the Buzzard Well B-34y, offshore UK. The plan was to run the lower completion, which was made up of Baker Stand Alone Screens (SAS) and a Baker Fluid Loss Control Valve (FLCV). Welltec® was originally called out to enable the installation of a 4 1/2” Petrowell Bridge Plug to facilitate packer setting and protect the FLCV from prematurely shearing. Retrieval of the junk catcher and the plug following the setting of the packer was planned to be carried out using slickline.

OPERATION

The plug was successfully conveyed to depth using a 318 Well Tractor® and then set using a Baker setting tool run below. After the production packer was set, a slickline run, comprising a bottom hole assembly (BHA) dummy string and roller bogies to take the BHA to depth, was run in hole. It soon became apparent that the operation could not be completed successfully using the slickline. Welltec was asked to run the Well Stroker® and Well Tractor together with the slickline retrieval assemblies to fish the junk basket in the first run and the bridge plug on the second run.

ACHIEVEMENTS

The clean-out intervention was completed in 34 days of daylight operations and provided confirmation of the total amounts of sand recovered to surface. The Well Cleaner® PST proved to be an efficient alternative to a conventional coiled tubing unit for this operator who applied the solution for the first time. HSE risks were reduced by applying e-line compared to heavier intervention methods like coiled tubing; less and lighter equipment was involved, fewer lifts were required and mobilization was done considerably faster with Welltec’s solution.

 

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Both runs were completed without incident, and both the junk basket and bridge plug were latched using the Well Tractor, the release pins were sheared using the Well Stroker and pulled to surface.