ThermaLock is a non Portland cement system. It is a product of joint research on high temperature geothermal wells. It has been tested and proven at temperatures as low as 140 deg F and as high as 700 deg F and is specially designed for corrosive CO2 environments.
Resists corrosion caused by CO2
Protects pipe and casing
Good for all temperatures
Non-Portland cement formulation
High strength development and weight retention
Carbon dioxide (CO2) is a common element in downhole fluids, whether naturally occurring in ground waters or the result of CO2 injection processes. When CO2 comes into contact with the Portland cement that is used to cement well casings, it produces a deterioration phenomenon in the cement called carbonation. Over time, the loss of cement due to carbonation can cause serious damage to downhole tubulars and destroy zonal isolation integrity, resulting in costly remedial services or even abandonment of a well.
ThermaLock™ cement is a specially formulated calcium phosphate cement that is both CO2 and acid resistant. The result of a joint development project for high temperature, geothermal wells, ThermaLock cement is now being promoted as an alternative for Portland cement wherever CO2 may be encountered. It has been laboratory tested and proven at temperatures as low as 140°F and as high as 700°F. Under test conditions that cause Class G, H, and latex containing Portland cements to lose up to half their weight, ThermaLock cement’s properties are only slightly affected or may actually improve.
ThermaLock cement can provide the following benefits:
Can greatly reduce concerns about the long-term affects of CO2 and acid in operators’ wells
Can save high remedial operation costs
Can save abandonment, re-drilling, and recompletion costs
Doesn’t require special cementing equipment or techniques
Greatly expands operators’ cementing options and opportunities for new applications
ThermaLock™ cement is a specially formulated calcium phosphate cement that is both CO2 and acid resistant. The result of a joint development project for high temperature, geothermal wells, ThermaLock cement is now being promoted as an alternative for Portland cement wherever CO2 may be encountered.
Increasingly common, wellbores intersect massive salt and/or CO2 zones that can cause mechanical destruction and/or chemical erosion of the cement sheath, which may lead to damaged casing and in severe cases may result in a lost well.
For decades, Halliburton has been involved in significant geothermal projects around the world—in countries including the U.S.,Phillipines, Indonesia, Japan, Australia, New Zealand, Germany, Denmark and Sweden.
A West Coast geothermal customer had experienced severe losses during the drilling stage of a well. The objective was to drill a 17.5 inch hole to 3,720 feet and cement in place a 13 3/8 inch carbon steel casing string.