COMPOSITIONS AND METHODS FOR WELL COMPLETIONS

摘要

Thermal recovery wells, geothermal wells and deep hot wells may involve the application of heat to the cement sheath and well casing at some time after the cement has set. Such heating may subject the cement sheath to mechanical burdens that may lead to failure. Such burdens may be lessened if the linear thermal coefficient of expansion is variable and approximates that of the well casing. A variable linear thermal coefficient of expansion may be achieved by incorporating blast furnace slag, silica fume, fly ash or a combination thereof in the cement blend.