Optical analysis devices may be configured for optically interacting a set cement with a chemical filter and a detector that together are configured to detect a characteristic of the set cement, wherein optically interacting the set cement with the chemical filter comprises absorbing, by the chemical filter, at least a portion of an electromagnetic radiation having optically interacted with the set cement. Relative to cementing operations, such optical analysis devices may be useful in identifying fluids, analyzing compositions of cement slurries, investigating the status of a reaction occurring in a cement slurry, detecting and/or monitoring corrosion of a set cement, and the like.

A wellbore servicing fluid comprises an aqueous base fluid, one or more alkali metal or alkali earth metal salts, at least one visocisifier, and a filtration control package. The filtration control package may comprise a carboxylic acid and an ethoxylated alcohol compound. Alternatively, the filtration control package may comprise a polyethylene glycol. The carboxylic acid may have from 8 to 20 carbon atoms. The ethoxylated alcohol compound may have a general formula R—(OCH.sub.2CH.sub.2).sub.X—OH, where R is a hydrocarbon having from 10 to 16 atoms and x is an integer from 6 to 9. The ethoxylated alcohol compound may have a hydrophilic-lipophilic balance of from 8.0 to 16.0. The polyethylene glycol may have a mass average molar mass (M.sub.w) of less than or equal to 1500 daltons.

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurry contains water, a cement precursor material, an alcohol surfactant having from 10 to 20 carbon atoms and a carboxylic acid comprising an aliphatic chain having from 16 to 18 carbons. In some embodiments, the alcohol surfactant may comprise the formula R—(OC.sub.2H.sub.4).sub.x—OH where R is a hydrocarbyl group having from 10 to 20 carbons and x is an integer from 1 to 10. The cured cement contains water, cement, an alcohol surfactant having from 10 to 20 carbon atoms and a carboxylic acid comprising an aliphatic chain having from 16 to 18 carbons. In some embodiments, the alcohol surfactant may comprise the formula R—(OC.sub.2H.sub.4).sub.x—OH where R is a hydrocarbyl group having from 10 to 20 carbons and x is an integer from 1 to 10.

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurry contains water, a cement precursor material, an alcohol surfactant having from 10 to 20 carbon atoms and a carboxylic acid comprising an aliphatic chain having from 16 to 18 carbons. In some embodiments, the alcohol surfactant may comprise the formula R—(OC.sub.2H.sub.4).sub.x—OH where R is a hydrocarbyl group having from 10 to 20 carbons and x is an integer from 1 to 10. The cured cement contains water, cement, an alcohol surfactant having from 10 to 20 carbon atoms and a carboxylic acid comprising an aliphatic chain having from 16 to 18 carbons. In some embodiments, the alcohol surfactant may comprise the formula R—(OC.sub.2H.sub.4).sub.x—OH where R is a hydrocarbyl group having from 10 to 20 carbons and x is an integer from 1 to 10.

A method of cementing a wellbore comprises injecting into the wellbore a cement slurry comprising an aqueous carrier, a swellable nanoclay, and a solid delayed releasing divalent inorganic salt comprising calcined magnesium oxide, calcined calcium oxide, calcium magnesium polyphosphate, a borate, a nitride, a silicate, an agent having a cation of Ba.sup.2+, Sr.sup.2+, Fe.sup.2+, Ni.sup.2+, or a combination comprising at least one of the foregoing; and allowing the cement slurry to set.

Methods for using cement compositions in subterranean formations are provided. In some embodiments, the methods comprise introducing a first treatment fluid comprising a first base fluid and a metal oxide into a wellbore penetrating at least a portion of a subterranean formation; introducing a spacer fluid into the wellbore that separates the first treatment fluid from at least a second treatment fluid; introducing the second treatment fluid into the wellbore, wherein the second treatment fluid comprises a second base fluid and a soluble salt; allowing the first treatment fluid to contact the second treatment fluid to form a cement mixture; and allowing the cement mixture to at least partially set.

Spacer fluid compositions comprising water, a clay, and a sulfur-containing polyether surfactant are disclosed, and such compositions often can further include a weighting additive, an antifoaming additive, and a co-solvent. These spacer fluid compositions can be used to treat metal casing and to remove drilling fluid residue for improved cement bonding in wellbore applications.

Anti-bit balling drilling fluids and methods of making and using drilling fluids are provided. The anti-bit balling drilling fluid contains water, a clay-based component, and at least one of a surfactant having the formula: R(OC.sub.2H.sub.4).sub.xOH, where R is a hydrocarbyl group having from 10 to 20 carbon atoms and x is an integer from 1 and 10, or a polyethylene glycol having the formula: H(OCH.sub.2CH.sub.2).sub.nOH, where n is an integer from 1 to 50. Methods of making and using these drilling fluids are also provided.

The present disclosure relates to spacer fluids for use in subterranean operations and, more particularly, in certain embodiments, to spacer fluids that include a spacer additive comprising a solid scouring material and a biopolymer gum while being essential free of clay. An example method may comprise spacer fluid comprise water and a spacer additive. The spacer additive may comprise a solid scouring material and a biopolymer gum, wherein the solid scouring material comprises crystalline silica in an amount of about 5 wt. % or less, and wherein the spacer fluid is essentially free of clay. The example method may further comprise and introducing the spacer fluid into a wellbore to displace at least a portion of a first fluid in the wellbore.

A wellbore servicing composition comprising: cement kiln dust (CKD), an organic acid, and water. A method of servicing a wellbore penetrating a subterranean formation, comprising: placing a wellbore servicing composition into the wellbore, wherein the wellbore servicing composition comprises CKD, an organic acid, and water. A method of servicing a wellbore with annular space between a wellbore wall and casing disposed therein, wherein a first fluid is present in at least a portion of the annular space, comprising placing a second fluid into at least a portion of the annular space and displacing at least a portion of the first fluid from the annular space, and placing a third fluid into at least a portion of the annular space and displacing at least a portion of the second fluid from the annular space, wherein the second fluid, the third fluid, or both comprise CKD, an organic acid, and water.