Abstract: Some aspects of what is described here relate to analyzing a well cement slurry. In some aspects, a well cement slurry is mixed in a mixer under a plurality of conditions. The plurality of conditions correspond to a plurality of distinct Reynolds number values for the well cement slurry in the mixer. Power number values associated with mixing the well cement slurry in the mixer under the plurality of conditions are identified. Each power number value is based on an amount of energy used to mix the well cement slurry under a respective one of the plurality of conditions. Values for parameters of a functional relationship between power number and Reynolds number are identified based on the power number values and the Reynolds number values for the plurality of conditions.

Abstract: In some implementations, a method for validating an acoustic bond-log tool includes having a test fixture including a wellbore casing emulating tubing. An outer tubing emulates a well formation and forms a perimeter of an annulus surrounding the wellbore casing emulating tubing. The wellbore casing tubing is configured with a stepped outer surface emulating different wellbore casing sidewall thicknesses. A dividing structure is coupled in the axial direction to the outer surface of the wellbore casing emulating tubing and to the inner surface of the outer tubing to radially subdivide the annulus into a plurality of hermetically sealable sample sections. Each sample section contains a sample of a material having a known acoustic impedance. The acoustic bond-log tool is validated by comparing a bond-log tool measurement of the acoustic impedance of each sample in a particular sample section to the known acoustic impedance of the sample.

Abstract: A variety of methods and compositions are disclosed, including, in one embodiment a method comprises providing a set-delayed cement composition comprising: a hydraulic cement, water, and a primary retarder; activating the set-delayed cement composition through a retarder exchange whereby a secondary retarder is added to the set-delayed cement composition to produce an activated cement composition; and allowing the activated cement composition to set.

Abstract: Colloidal high aspect ratio nanosilica additives that comprise colloidal high aspect ratio nanosilica particles having an average diameter of about 100 nm or less and an average aspect ratio of about 1.5 or greater may be useful in forming sealants in a wellbore, a subterranean formation, or both. For example, a method may include introducing a wellbore fluid into a wellbore penetrating a subterranean formation, the wellbore fluid comprising an aqueous base fluid, an activator, and a colloidal high aspect ratio nanosilica additive; placing the wellbore fluid into a portion of the wellbore, a portion of the subterranean formation, or both; and forming a sealant that comprises the colloidal high aspect ratio nanosilica additive therein.