Drew Johnson Pistachio Ranch
Mr. Johnson’s 8-year-old well suffered a severe decline in performance (53%) due to rampant iron bacteria encrustation. The well pump was maxed out at 1900 rpm, but was only generating 42 psi in the irrigation lines – 24% less than the 55 psi needed to deliver full flow to the groves.
WellJet blasted the entire perf zone from 450’-850’.
When the well went back online, it produced 97% of the flow rate that it had when brand-new. The pump generated 62 psi @ 1800 rpm – producing too much water at too high a pressure. The owner was concerned about blowing the valves on his irrigation lines. So the pump was throttled back to 1400 rpm/55 psi (saving 35% in energy costs).
Mr. Johnson was so happy with the outcome that he engaged WellJet to rehab the well on his dairy farm shortly thereafter.
Drill date: 2003
Specs: 850’ depth, 15½” ID, mild steel, louvered perfs
Original production (2003): 900 gpm
Pre-WellJet performance (2011): 420 gpm (-53%), drawdown 210’, specific capacity 2.0
Post-WellJet performance: 875 gpm (+209%), drawdown 98’ (+53%), specific capacity 8.93 (+446%)
