Our latest video of the month displays how EV’s Optis R150 Technology helped an operator in New Zealand to diagnose and overcome an injection issue with one of their geothermal wells.
The operator experienced a sudden drop in performance of their water injection well after undergoing a scale clean up in their separated geothermal water disposal pond. It was expected that fragments of scale had caused a blockage in the injection inlets or deeper in the well. In order to avoid further damage and choose the correct method of remediation, EV's Optis R150 was deployed to give the operator a clear understanding of the location of the scale and the integrity of the well to select the correct method of remediation.
The downview and sideview cameras of the Optis R150 confirmed the presence of fragmented scale at several depths in the well, and distinctly showed the accumulation of scale around the perforations - restricting injectivity. The sideview camera also revealed minimal pitting within the well, meaning that the operator could take the appropriate remediation method that would not cause any further damage to the well. In this instance, the operator decided to chemically stimulate the well to try and dissolve the scale in-situ and after bullheading an acid mix from surface, the injectivity increased, exceeding initial records for the well. This rapid and low-cost remediation enabled water disposal to be reinstated without any disruption to power generation.