In-Situ Gas Generation Techniques to Enhance Primary Cementing

Abstract Wellbore integrity is critical in upstream petroleum operations as it mitigates hazards like blowouts and other environmental impacts. Primary cementing establishes a durable barrier that isolates geological formations, preventing collapse, swelling, or pressure buildup that could allow fluid or gas migration in the annulus. It also protects casing from corrosion caused by earth elements. Drilling challenging wells in harsh conditions, such as high temperatures, necessitates advanced techniques to enhance wellbore integrity. High temperatures can cause cement issues like cracking, accelerated setting time, and poor bonding. This research addresses thermal degradation of foaming agents, which generate gas to expand cement volume. In-situ nitrogen expansion enhances bonding between casing and formation. Key tests evaluate innovative formulation performance. Screening assesses foaming agent concentrations by observing expansion volume. Thickening time test ensures cement slurry injectability under downhole pressure and temperature conditions. Linear expansion test measure cement growth during setting, while ambient expansion test simulates top-casing conditions. Compressive strength test determines the cement’s mechanical resilience, and rheology measurement evaluates pumpability. The optimized formulation enhances wellbore integrity by achieving uniform expansion, strong mechanical properties, and high-quality isolation. This ensures safe, efficient, and reliable cementing under various challenging conditions.