Study of Shallow Marine Hydrate Dissociation and Reservoir Pore Pressure Redistribution Induced by Suction Anchor Penetration
A multi-physics field coupled numerical simulation method is adopted to analyze marine hydrate dissociation and pressure change in the reservoir pore induced by the installation of a deepwater suction anchor,which is widely applied in deepwater oil and gas engineering.It is shown that the negative pressure induced by the installation of the suction anchor leads to the reduction of the pressure in the reservoir pore,which in turn induces hydrate dissociation.However,a large amount of gas produced due to hydrate dissociation will slow down the decrease of the reservoir pore pressure and result in the loss of negative pressure in the installation.As the area affected by the negative pressure increases,the range of hydrate dissociation gradually expands from a shallow layer to a deeper one,with the maximum rate of hydrate dissociation occurring in the initially affected shallow layer.
installation of suction anchor with negative pressurehydrate dissociationpressure distributionmulti-field coupling
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