A full test to find the best DJT setup with pumps, valves and flappers was conducted in Bergen which demonstrated that samples of both solids and liquids will be preserved in the bailers from TD to surface. The first run into the well would not pass the downhole safety valve (DHSV) and the tool-string needed to be reconfigured with standoffs, centralizers and modified nozzle which then passed the DHSV and successfully sampled the 6 liters of solids in one chamber and 1 liter of fluid in a second separate chamber during the same run in hole. The samples were then delivered to the client for lab analysis.
On the following day the chosen chemical surfactant was loaded into the DJT bailer and run in hole. The DJT nozzle was positioned at the bottom of the screens and performed two passes through the screens as per program. Each pass consisted of stations every third meter, with 2 minute intervals.
After completing the treatment, the well was put back on production and began to flow, which it had not done previously. The treatment proved the effectiveness of the DJT nozzle and flow rate to jet flush and clean plugged sand screens. By modifying the DJT with a new valve, it has proven to also be effective in sampling both solids and fluids in separated chambers and returning them to surface.