Key words: premature failures of downhole equipment, well killing fluids, bottomhole formation zone, standardized well killing fluids, oil production, time-to-treatment.
A lot of ESP failures in Samotlorneftegaz OJSC occur due to deposition of salts (MTBF is up 200 days). The analysis showed high probability of fluids penetrating into the bottomhole formation zone which can lead to waters incompatibility and intensive salting-up immediately after workover jobs. To protect wells from such complications, a well killing technology using standardized fluids has been developed. The essence of the technology is about including scaling inhibitors and wetting agents into well killing fluids at the preparation stage. This helps to protect the downhole equipment from salting-up during 4-5 months after a well start-up when workover jobs are finished.
