Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

The sediments in the South China sea are mainly composed of clayey silt, characterized by weak cementation, low strength, and poor permeability. These characteristics lead to slow gas water transport production efficiency process, which is not conducive reservoir stability. Therefore, this paper studied influence different factors on displacement permeability hydrate-bearing using remolded cores from Sea. It was found that, when depressurization method used for hydrate decomposition, change could be divided into three stages: stage, decomposition creep stage. During decompression sediment deformation rapid small. process hydrates, maximum. stage had slowest smallest displacement. increased with increase initial porosity, saturation, effective pressure, amplitude. lower than that original after decomposition. This damage range pressure. Furthermore, positively correlated damage.