Publications

The mature BK-1 oil well was located on the BK field, southern side of Padang Island, Riau Province in Sumatra. The well was already producing for 22 years from the single sand G3010. The other sands were penetrated, but had lower-resistivity (2-3 ohm.m) and seems similar to both the water or shale resistivity. Facing declining oil production and abandoning the well, in 2013 the team evaluated the sands one more time and found by-passed oil in low resistivity in G1010A, G1015 sands and by-passed oil in G3010 open sand. This paper will explain the workflow of how to find the by-passed oil, consider the geological part and the description of oil bearing in the low resistivity sand, the story of through tubing perforation, the surveillance logs, until the work-over well, completion strategy and future opportunities. This project has successfully found the by-passed oil via Carbon-Oxygen (CO) logs and Production Logging Tool (PLT) survey. It had oil gain around 150 bopd, and has already paid off in 27 days. This is a good case history of how aggressive well surveillance can increase oil recovery and dramatically extended well life.