The Pre-stressed Vacuum Insulated Tubing/Casing is innovative Tubing/Casing for thermal recovery of heavy oil or bitumen. It is used in Steam Assisted Gravity Drainage (SAGD) and In Cyclic Steam Stimulation (CSS). It reduces the heat loss of the high temperature steam during injection phase. And keep oil hot during production phase. The build-in pre-stress feature can compensate the thermal stress on tubing/casing induced from hot steam, prevent the casing and cement mantle damage from high temperature, and increase tubing casing service life.
