ABSTRACT

This experimental study evaluated the performance of sand control screens used to inhibit the production of sand accompanying hydrate dissociation by applying depressurization. Experimental apparatus was developed that visualizes the phenomenon of the production of sand and fine particles during hydrate dissociation. The sediment samples were prepared using sand the size distribution of which was similar to that of sandy layers in real hydrate fields. The screen sample was the same specification as that of a commercialized product used for well completion. In order to evaluate both gas production behavior and the performance of the screen sample according to hydrate dissociation by the application of depressurization, the internal pressure of sediment samples, amounts of water and gas produced, and imaging and photos of the sand-production phenomenon were observed on a real-time basis. Hydrate production behavior showed different results according to whether free gas was present. The results of the screen performance showed that sand production was not visibly observed in the screen sample, and the amount of sand collected after the experiment was less than 0.012% of the total mass of the sediment samples.

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