CT technologies are widely implemented by Schlumberger in Russia for cleanouts of oil and gas wells as well as for production stimulation, logging and also drilling the horizontal wells. CT operations in Astrakhan field are an example of successful experience of CT intervention in

highly sour high pressure/high temperature environment. Astrakhan gas condensate field is extremely harsh in terms of highly corrosive  conditions, due to H2S concentration of up to 26% vol., bottom hole temperature of 110 °C and formation pressure as high as 600 bars. All this has a significant corrosive effect on downhole equipment during well production and workover.