Access to Rumaila’s oil currently comes through over 700 wells, the majority of which are focused upon the Zubair (Main Pay) formation. Of these, approximately 550 are producers and 150 are injectors.
Over 300 new wells have been drilled since 2010, which now account for 40% of the field’s total oil production.
The size and scale of the new drilling programme is immense and aims to increase the number of wells accessing the Zubair and Upper Shale, but also, increasingly the Mishrif, to reach the vast reserves there. Over 300 new wells have been drilled since the programme began, producing a combined average of 560,000 barrels per day.
Maximizing production from existing wells is also crucial. Many wells were performing below capacity or had ceased completely, so a number of techniques have been deployed to resurrect them. 300 Electric Submersible Pumps have been repaired or installed from new and placed in selected wells, producing between 500-2,500 bpd from each previously ‘ceased’ well. Nitrogen lift and perforation technologies have been deployed in over 150 wells to raise production.
We have also recently introduced High Angle Wells for the first time in the field‘s history, allowing us to drill horizontally across the formation – and which proved to be 300% more effective than conventional vertical wells. Read more here.
Also newly introduced to the field are Y-tools for logging data below ESP pumps, and smart coil units and mast coil units to undertake a range of workover jobs. Complex water shut-off jobs using more rapid coil units instead of rigs have also been successfully piloted.