New wells often have initial production that comes on at high rates and pressures. In this case, an established producer in southern Oklahoma drilled three wells from a pad site. While all of the wells were “keepers,” one of the wells was extraordinarily strong. Based on initial test data, EcoVapor recommended the site be piped to accommodate at least two of our largest ERS170 systems. The oil produced from the target formation has an API°in the high 50’s, so with the high production rates we were expecting correspondingly high amounts of fl ash gas off the tanks. The operator plumbed the site to accommodate more, but initially installed only one ERS170 system.
As the wells were brought on line, it was clear that like the scene in the movie Jaws where the captain sees the shark and declares “we’re going to need a bigger boat…”, this pad site was going to need more vapor recovery capacity, and fast. Tank pressures were running at 15+ oz, indicating venting, and requiring the operator to curtail production.
Fortunately, the connections for the second EcoVapor system were installed and ready to go. EcoVapor moved in a second ERS170 system a few days later, together providing over 340 MCFD of vapor recovery capacity. That system was fired up and that additional gas was now moving to the sales line.
However, as shown in Figure 2, the site was still making more flash gas than the installed capacity, and tank pressures continued to exceed 12 oz on a regular basis.
The thermal flow meter on the flow line showed 270 MSCFD was still being burned, indicating that at least one more ERS170 unit would be required. The operator waited a few days to see if the wells would start to pull down, but that was not the case and production continued to climb instead.
This presented a new opportunity. EcoVapor had prior installations on high volume sites where two systems operated in parallel – three systems in parallel offered the next level in production volumes. The operator had enough room for a third system, and the existing piping was modified to tie in the 3rd system.
The final system was installed a few days after the second ERS system (see Figure 3) and the customer saw a noticeable impact on the tank pressures (see Figure 4) and flare.