Patent ID: 8931287
Filing Date: 2015-01-13
Classification: F17C,Y02C

Abstract:
1. A process for transferring liquid carbon dioxide from a pressurised and refrigerated liquefied gas container on a water-going transport vessel to an offshore injection well connected to a surface platform, said process comprising: connecting said container and said platform with a conduit comprising a main transfer line comprising a flexible section at least part of which is immersed within the water between said vessel and said platform, a first pump, a second pump, at least one heater, an expansion tank, and a third pump; using said first pump to pump liquid carbon dioxide from said container along said conduit to said second pump; using said second pump pumping said liquid carbon dioxide along said conduit and past said at least one heater to said third pump; using said at least one heater for heating said liquid carbon dioxide before it reaches said third pump, using said third pump to pump said liquid carbon dioxide down said injection well, wherein said at least one heater is connected to the main transfer line of the conduit; using said expansion tank to regulate the pressure in said conduit upstream of said third pump and downstream of the upstream end of said flexible section in the period before operation of said third pump to pump said liquid carbon dioxide down said injection well, wherein said expansion tank is connected to the main transfer line of the conduit by a branch line and a valve in a way such that the expansion tank accommodates increases in carbon dioxide volume in the conduit; and using a fourth pump or pressurised gas to transfer liquid carbon dioxide collected in said expansion tank to said main transfer line of the conduit during the period of operation of said third pump to pump said liquid carbon dioxide down said injection well, wherein said liquid carbon dioxide is maintained at a pressure greater than 5.2 bar during the transferring process so that the liquid carbon dioxide is in a liquid state during the transferring from the gas container to the injection well.