ThermaSTONE Thermally Responsive Cement System

Ensure long-term integrity in heavy oil and geothermal wells

ThermaSTONE thermally responsive cement expands and contracts with the high pressures and temperatures encountered in heavy oil and geothermal environments. It is capable of expanding up to 2%—nearly the same as steel casing. This reduces cement sheath stress up to six times more than conventional systems, dramatically reducing the risk of failure within the set cement.

Withstand fluctuating pressures and temperatures

ThermaSTONE cement provides stability at temperatures up to 662 degF [350 degC]. It is optimized to

  • set at low temperatures
  • have a high coefficient of thermal expansion
  • have low Young’s modulus at steam conditions
  • use standard cementing equipment

Extended tensile strength

Lab testing at 650 degF [344 degC] showed that ThermaSTONE cement retained tensile strength more than 6 months. The tensile strength of conventional cementing systems decreased over time.

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New Thermally Responsive Cement for Heavy Oil Wells

ThermaSTONE Thermally Responsive Cement System
This paper describes the application of thermally responsive cement for zonal isolation in Canada's oil sands, one of the world’s largest hydrocarbon resources. Read technical paper