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Rapid CO₂ hydrate formation was investigated with the objective of producing a negatively buoyant CO₂−seawater mixture under high-pressure and low-temperature conditions, simulating direct CO₂ injection at intermediate ocean depths of 1.0−1.3 km. A coflow reactor was developed to maximize CO₂ hydrate production by injecting water droplets (e.g., ∼267 μm average diameter) from a capillary tube into liquid CO₂. The droplets were injected in the mixing zone of the reactor where CO₂ hydrate formed at the surface of the water droplets. The water-encased hydrate particles aggregated in the liquid CO₂, producing a paste-like composite containing CO₂ hydrate, liquid CO₂, and water phases. This composite was extruded into ambient water from the coflow reactor as a coherent cylindrical mass, approximately 6 mm in diameter, which broke into pieces 5−10 cm long. Both modeling and experiments …