Patent ID: 6138759
Filing Date: 2000-10-31
Classification: C04B,C09K,Y02W,Y10S

Abstract:
An improved settable spotting fluid composition for use in cementing wells comprising:a hydraulic settable component selected from the group consisting of ASTM Class C or the equivalent fly ash and ASTM Class F or the equivalent fly ash together with a source of calcium;a fluid loss control additive;a gel strength inhibiting additive;a set retarding additive comprised of the calcium salt of a sulfomethylated lignin present in said composition in an amount in the range of from about 0.1% to about 2% by weight of said hydraulic settable component in said composition; andwater selected from the group of fresh water and salt water present in an amount sufficient to form a slurry having a density in the range of from about 12 to about 15 pounds per gallon.