Cement-based mixtures including particles of glass-reinforced plastic are disclosed. In some cases, the mixtures may include particles of glass-reinforced plastic having an average diameter less than approximately 100 microns and/or at least 95% particles of the glass-reinforced plastic in a mixture may have a diameter less than approximately 100 microns. The mixtures may be a dry cement mixture, a cement slurry, or a solidified piece of cement. In some cases, the mixtures may be used to form a solidified oil-field cement plug disposed in and filling a wellbore. A method of making a cement-based mixture includes reducing one or more glass-reinforced plastic components of a used, expired, or defective product into granular particles and blending the granular particles with a prefabricated cement powder or a cement paste to form a substantially homogenous mixture having less than approximately 50% of the granular particles by volume.

A variety of fluid loss control compositions and methods are provided for controlling fluid loss in a cementing operation. As described herein, polyelectrolyte complex nanoparticles and fluid loss control compositions containing polyelectrolyte complex nanoparticles can be effective for fluid loss control in a variety of cementing operations. Methods of making and methods of using the electrolyte complex nanoparticles and fluid loss control compositions containing polyelectrolyte complex nanoparticles are also provided. The polyelectrolyte complex nanoparticles can include a polycation polymer such as a branched chain polyethylenimine, and a polyanion polymer such as polyacrylic acid or poly(vinylsulfonic) acid. The polyelectrolyte complex nanoparticles can contain additional additives such as metal ions or fluid loss additives such as a cellulose polymer.

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurries have, among other attributes, improved expanding capabilities and may be used, for instance, in the oil and gas drilling industry. The cement slurry comprises water, a cement precursor material, and an expanding agent. The expanding agent comprising at least a poly(acrylic acid)-metal oxide nanocomposite, where the metal oxide comprises MgO, CaO, or both, and the poly(acrylic acid) comprises a t-butyl terminal group, an isobornyl terminal group, or both.

A water-adaptive cement self-healing system, a preparation method and an application thereof are provided. A pH-triggered shell curing agent, an inorganic nano-emulsifier, and a polysaccharide shell material are added into deionized water to obtain an aqueous phase; an active diluent of epoxy is added to an epoxy to obtain a first oil phase; the aqueous phase is mixed with the first oil phase to obtain an oil/water emulsion; a surfactant is added into paraffin oil to obtain a second oil phase; the second oil phase is mixed with the oil/water emulsion to obtain an oil/water/oil emulsion; an acidic liquid is added into the oil/water/oil emulsion dropwise to obtain a solid, followed by centrifuging, washing, and freeze-drying to obtain a self-healing capsule; and then an epoxy curing agent is mixed with the self-healing capsule to obtain the water-adaptive cement self-healing system based on an oil/water/oil double-emulsion template.

An agglomeration with fine particles of a hybrid material comprising carbon nanotubes (CNT) and a binder agent that is effective to create an agglomeration comprising the fine particles.

An agglomeration with fine particles of a hybrid material comprising carbon nanotubes (CNT) and a binder agent that is effective to create an agglomeration comprising the fine particles.