Liquid additives control cement slurry properties



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Texas Tech University


While liquid additives are used in offshore & international cementing operations, landbased operations use a bulk-dry-batch-mixed process. Additives control cement volumetric yield, thickening time, compressive strength, free water, rheology, and fluid loss control. Computerized closed-loop control of liquid additives: (1) allow unused, uncontaminated cement to be hauled off location after an operation, (2) promote environmental responsibility by reducing the volume of waste cement hauled to a landfill, and (3) provide better quality control of slurries lumped "on the-fly" due to better distribution of additives in the slurry, and tighter computerized tolerances.

Surface slurries utilizing liquid sodium silicate in API Class C cement were designed to meet, or exceed Texas Railroad Commission Rule 13' requirements for "zone of critical cement" and "extended cement" systems. Slurries were tested for thickening time, free water, compressive strength, and rheology for various combinations of weight, water, yield, additive concentration, and adherence to TRRC (Texas Rail Road Commission) Rule 13 specifications.