Milling of Permanent Bridge Plug Successfully Performed on Wireline
- Stephen Stragiotti (Statoil) | Øyvind Andersen (StatoilHydro) | Ole E. Karlsen (Welltec)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2010
- Document Type
- Journal Paper
- 2010. Society of Petroleum Engineers
- 3.1.6 Gas Lift
- bridge plug milling, production optimization, world's first, milling on wireline
- 1 in the last 30 days
- 555 since 2007
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A technological breakthrough within the application of wireline technologyhas been achieved. In August 2008 on an offshore platform on the Norwegiancontinental shelf, a wireline tractor and a new wireline milling system wereused to mill and remove a permanent bridge plug at 4,147 ft measured depth(MD).
The operator decided to mill out the plug on electric wireline and workedclosely with the service company to develop this novel solution. Havingdeveloped and tested several bits and milling tools, results showed that bycombining the wireline miller with hydraulically provided weight on bit (WOB),it would be possible to mill out the retaining rings of the plug, which wouldcause the plug to collapse. The milling-control unit allows the WOB to beadjusted for each application and also controls the reactive torque--the forcegenerated when the milling bit engages the plug.
The service company was able to develop the solution within the client'sparameters and in accordance with the timeline set out for this project. Theoffshore operation was completed in 3 days, to the operator's satisfaction.
In another platform well, a permanent bridge plug had been set in 2003 inthe sealbore between two screen sections [3-ft sealbore, 67° well angle,4.75-in. inner diameter (ID)]. The plug was set in order to isolate thesomewhat higher water cut in the lower reservoir zone to prolong oil productionfrom the well. In 2006, the well drowned after a 2-week-maintenance period. Twoyears later, a coiled-tubing (CT) gas lift operation was carried out with goodresults. It was then decided to remove the permanent bridge plug to reopen forproduction before another CT gas lift operation was carried out. A method formilling the permanent bridge plug was developed on the basis of lessons learnedfrom the other plug-milling operation and by extensive testing at the servicecompany's facilities. The operation was completed successfully in 13 days.
This new application for milling completion hardware and other wellboreobstructions offers a cost-efficient alternative to existing methods. Thesuccess of the milling operation is a significant achievement and has pushedthe limits for what is possible on electric wireline.
This paper will examine two cases of milling bridge plugs on electricwireline and the technical challenges that had to be overcome in offshoreoperations.The first case used the well stroker as WOB, and the second casedused the well tractor as WOB.
|File Size||817 KB||Number of Pages||7|
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