Sandvik Materials Technology has launched its hyper-duplex wireline for use in wells with extreme chloride environments. The new material, Sandvik SAF 2707 HD, was trialed over an eight-month period in wells offshore Indonesia. SAF 2707 HD, a high-alloy duplex stainless steel, is a stronger alloy with improved corrosion resistance and performance in chloride-intense environments compared with Sanicro 26Mo, and on a par with Sanicro 36Mo, the company’s sour service wireline materials. The new material has very high mechanical strength and resistance to pitting and crevice corrosion. Its PRE (pitting resistance equivalent) value is a minimum 48, which falls between the two Sanicro grades. It has a service temperature range of – 50C to 280C, which encompasses higher temperature gas wells. SAF 2707 HD also meets the potential needs of geothermal wells, where much higher temperatures can be found. In deep geothermal drilling in Iceland, for example, temperatures of 500C and more can be encountered. The new material has been laboratory tested in temperatures up to 600C and performed well.
