Sep 1, 2011, 9:00 AM
After drilling an appraisal well in 2006, Wintershall Noordzee B.V. subsequently drilled a near-horizontal open-hole side track into the Schloctern sandstone. The well was completed using a 4-1/2” StageFrac lower completion consisting of 5 Packer-Plus ball- actuated sliding sleeves with tandem open-hole packers. The completion program called for each zone to be fracced with 500,000 lb of coated 12/18 ceramic using an aggressive tip-screen-out, maximising net-pressure build-up, fracture width and fracture conductivity. Each fracced zone was to be isolated by dropping a large diameter metal ball in the displacement stage, pumping it to the ‘next seat up the completion’ and then hydraulically opening the sleeve to provide access to the next zone to be fracced. In landing on the seat, the ball isolated the previously fracced zone from the next operation.