Fouling can be caused by a number of factors and will typically occur in both injection and extraction bores. Due to the nature of down hole conditions it is an issue that can never be completely eliminated, though with the right method of injection control it can be substantially slowed and reduced. Fouling issues prevent bores from operating at their peak performance and can promote corrosion, lowering the overall life span of the bore.
Issues experienced with extraction bores may be:
Issues experienced with injection bores may be:
The fouled screen apertures and fouled aquifer porosity can be caused by any combination of bio fouling, calcite formation, silted sands and mineralised deposits formed by chemical reactions between the injection and extraction bore water chemistries.
There are a number of treatment options to cater for the different forms of fouling however injection bores typically require a program consisting of:
The typical procedure outlined above ensures that not only are the fouled screen apertures cleaned (similar to a mechanical brushing technique), but more importantly the fouled aquifer porosity issue is addressed, ensuring a more effective and longer lasting clean out without any mechanical damage to the bore.
AGE has a proven track record remediating geothermal bores and will be happy to discuss your particular bore symptoms, propose tailored solutions and to provide client references for similar work where requested.
Below is a list of clients AGE Developments have successfully treated their Injection/Production bores:
To find out more or to discuss any specific needs you have – be it for off the shelf equipment or custom designed equipment, contact AGE Developments.