ESP deployed via riser to subsea well ///
The No. 1 well in East Breaks Block 690 is a 4½-mi subsea tieback to Anadarko’s Nansen spar in the Western Gulf of Mexico. The well produced 1.7 million bbl oil before pressure depletion caused slugging and frequent liquid loading in the riser and the subsea flowline network. Loading of the riser occurred at a 5-10% watercut, leaving significant reserves in the ground. As such, a viable form of artificial lift was needed.
In February 2007, an Electrical Submersible Pump (ESP) was installed in the subsea riser leading to EB 690 No. 1. A Hydraulic WorkOver (HWO) unit was rigged up on the Nansen spar, and the pump was deployed on 2 7/8-in. tubing through the 6-in. riser.
With the ESP allowing for a lower pressure at the riser base, multiple benefits have been realized, including the elimination of slugging, higher fluid rates and the lowering of the reservoir abandonment pressure.
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