Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 122
Successful Application of a Versatile Ultrasonic Test System for Gas Hydrates in Unconsolidated Sediments
Yang, J., Llamedo, M., Marinakis, D., Tohidi, B., and Varotsis, N.
The 5th International Conference on Gas Hydrates, Trondheim, Norway, June 13-16 (2005).
A versatile ultrasonic test system has been developed and successfully applied to experimental investigation of gas hydrates in unconsolidated sediments. The system was applied to experimental investigation of kinetics of gas hydrate formation and dissociation, simulation tests of gas production from gas hydrates, and experimental measurements of geomechanical properties of hydrate-bearing sediments. In the kinetic tests, acoustic velocity response to the whole kinetic process of methane hydrate formation and dissociation in sediments was gained. This provides a unique test method to determine hydrate formation and dissociation in porous media, especially when conventional pressure analysis was not feasible in the absence of free gas. In the simulation tests of gas production, natural hydrates formed in sediments, and gas was produced from hydrate dissociation by depressurisation. It was found that water was always produced before significant gas flux occurred in the early period of depressurisation. During the pump-controlled depressurisation tests, strain-stress relation of hydrate-bearing sediments was measured, and the effect of hydrate decomposition on the geomechanical properties of unconsolidated sediments was experimentally examined.

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