8 JULY 2025 WorldWide Drilling Resource® Maintenance Treatment on a Water Well Adapted from Information by Cotey Chemical Corporation The decline in water well productivity can be compared to the progression of periodontal disease in dental health. Just as periodontal disease can lead to significant bone loss and render teeth ineffective, excessive buildup or slitting in a water well can lead to diminished yields that become ineffective. Fortunately, similar to how dental health can be preserved through preventive care, water wells can also be maintained in peak condition with proactive measures. Cotey Chemical advises water wells undergo preventive treatments at least once a year. It’s worth noting that prevention of scale and corrosion is much simpler than addressing these issues after they occur. Without a doubt, mineral deposits are among the most challenging issues to address. These deposits typically originate from three primary sources: red or brown deposits, which are mostly attributed to iron-based minerals; brown and black deposits, generally stem from magnesiumbased minerals; and white or yellow deposits, commonly resulting from calcium carbonate (limestone) or dolomite. Interestingly, a significant portion of the hard mineral deposits encountered in wells nationwide are biologically precipitated, meaning they are formed and subsequently deposited by biofouling slimes. What complicates the removal of these mineral deposits is their hardness. This cement-like structure poses a substantial challenge, especially in hard-to-reach areas such as gravel pack, water-bearing formations, and low-flow zones. The situation becomes even more difficult when deposits are located deeper within the formation and low-flow areas, thus exacerbating an already tough problem. Installing a drip chlorinator can be an excellent investment for many water wells. By administering drip chlorination to the pump, pressure tanks (if applicable), or piping, tailored to address specific local water issues, iron bacteria can be effectively eradicated. This method not only kills the bacteria but also helps separate iron out of the water. Additionally, drip chlorination can curb the formation of iron and manganese scaling and eliminate coliform bacteria. Over time, it is expected to clear any remaining iron scale from the well screen and pump, while also addressing other unwanted elements such as sulfur, nitrate, manganese, and iron in the water. Moreover, the regular introduction of polyphosphates, similar to chlorine, can inhibit iron scale formation within the well and irrigation systems by keeping iron in a soluble state. If the water is distributed to homes, it is advisable to use in-line filters to ensure quality. Once a well is newly constructed or has undergone recent rehabilitation, it’s essential to start scheduling routine maintenance treatments. This proactive approach allows for cleaning when the buildup of materials is minimal, soft, and easier to eliminate. For drilling contractors this could also be an income resource during your down times. Moreover, it can significantly prolong the lifespan of the well, ultimately leading to substantial savings in both time and money. WTR Looking for Events? Click on this box in our online issue worldwidedrillingresource.com
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