Method of extending the thermal stability of a diutan gum based cement spacer system
Publication Date: 2014-Oct-27
The IP.com Prior Art Database
Current cement spacer systems containing diutan gum lose viscosity due to degradation of the biopolymer around 300 F. With the addition of sodium thiosulfate, the retention of viscosity is possible for longer periods of times and higher temperatures. As seen below, the temperature is ramped up to 300F and helf for 30 minutes followed by a shear rate sweept and then further holding temperature at 300F. The use of the stabilizer sodium thiosulfate signifactly extends the lifetime of the polymer as indicated by the retention of high reading values.