30 NOVEMBER 2023 WorldWide Drilling Resource® between the efficiency of all the methods available and led to a new publication DVGW W 130 in 2007. In a comparison of all available methods, the high-pressure impulse (HPI) process achieved outstanding results in terms of efficiency. This technological advantage had already been confirmed several times by independent authorities, making it the market leading technology in Europe for almost three decades. The KIWA Water Research also tested and approved the developability of this process for a proposed 100-foot well. The DVGW certified this process as a fine sand discharge solution. The Bavarian Federal Office for the Environment titled this process as "BestPractice" solution for well development and rehabilitation. Rather than one row of nozzles, the HPI process incorporates two heads with two counterrotating nozzles each. The counter rotation creates a high-pressure impulse wave that penetrates up to 6.5 feet laterally through the filter pack, into the invaded zone, and beyond into the aquifer. The 24-inch head spacing design covers a wider active cleaning area making quick work of each development or rehabilitation project. When sandwiched between two heads, a low-pressure or suction zone is created which draws loosened deposits, debris, or other solids into the well. The Etschel Brunnenservice JET Master® has two birotational (counter or oppositely driven) heads in contrast to the conventional single self-rotating nor a stationary horizontal jetting head assembly. Each micro-precise angled nozzle (MAXINOZ®) uses up to 12 gpm of water at 590 fps exit velocity. With up to 8000 psi system pressure, the heads counterrotate up to 7000 rpm. Each head travels in opposite directions due to its recoil effect. At 7000 rpm, the water bubbles expand and then collapse causing a high-pressure impulse wave similar but stronger than the gas impulse and percussive types. This contributes up to a 6.5-foot laterally penetrating wave through the filter pack and into the aquifer. [Learn more next month in Part 2.] JET Master Cont’d from page 24.
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