Well Cementing of the Bottomhole Zone and Annulus Using Nanostructured Cement Slurries

The research aims to comprehensively investigate the impact of nanoparticles (NPs) of various sizes and compositions, including Cu- and Al-based structures, on physicochemical processes in multiphase environments and the resulting changes to rheological properties. The article highlights the benefits of using innovative nanocomposite materials in wellbore reinforcement and layer-cementation technologies to mitigate sand flow from the formation. Experimental investigations demonstrated that the application of the nanosystem increased porosity and permeability by up to twofold, while regulating the slurry’s flowability and the initial and final setting times. The ability of Al-based NPs to generate a gas phase during exothermic reactions promoted the formation of microchannels within the cement matrix, enabling well commissioning without perforation. In this process, the volume of the nanostructured buffer slurry was expanded by 25–35 %, depending on the slurry setting time, and can be effectively regulated. The research also investigated the application of nanostructured, lightweight cement-based tamping solutions to address technological challenges encountered during well cementing: abnormal low-pressure reservoirs (tamping solution absorption), lack of hermeticity behind the casing, and the formation of interlayer connections. The preparation technology of such compositions, the interactions among components, and the rheological and physical-mechanical properties of the solution were studied under laboratory and field conditions. The results demonstrated that the complex application of metal-based nanostructures, in addition to optimizing the physical and mechanical properties of reservoir systems, also significantly enhances oil production in productive layers. This approach can be considered not as a complement to existing technologies, but as a fundamental stage that lays the groundwork for a new generation of technological transformation.