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Transporting economically viable compressed gas liquids from remote fields

Even with the re-emerging CNG technology, there still remains a need for an economically viable, efficient and flexible trans-ocean transportation system for moving natural gas from the remote or stranded fields to market. Also, any marine gas transportation system must provide both the producer and the market value. The emergence of CGL Carrier using Compressed Gas Liquid (CGL) technology is designed to fill this void.

CGL transport gains its advantages from proven gas property research work. This work has confirmed that under exact conditions of pressure, temperature along with specific mixture compositions, a more dense volumetric packing of the natural gas can be attained within a given volume than can be achieved in the same space using natural gas alone under the same conditions.

The concept of carrying more gas within a liquid matrix of NGLís has given rise to the term 'Compressed Gas Liquid' for this method of transport. The term 'LNG Lite' has also been used to describe its relatively higher volumetric storage ratio (compared to CNG) using less exotic equipment and at substantially lower CAPEX and OPEX than that required for LNG systems. With its pipeline roots, the CGLô concept deploys a continuous large diameter steel pipeline packed within the cargo holds of a converted vessel or above deck on a new-build vessel for transporting the production gas as a liquefied cargo.

Integral CGL carrier
Fig:Integral CGL carrier

In an integral carrier transportation model , the CGL Carrier is entirely self-contained. It carries CGL processing equipment on one side of the ship to load the raw production or conditioned natural gas and create the storage liquid for containment within the pipeline cargo system. On the other side of the carrier, an offloading process train is provided to separate the natural gas from its NGL 'solvent'. The natural gas is offloaded and the NGL returned to storage within the pipeline system ready to load the next shipment.

In a shuttle carrier transportation model, a loading barge is placed at the production gas source, where the raw production gas is loaded directly from the field onto the barge. The loading barge has all the necessary raw gas conditioning and CGL processing equipment to load the entire conditioned produced natural gas in a liquid form onto the CGLC and into the refrigerated pipeline cargo system. At the market end, the CGLC unloads the liquefied gas cargo onto an offloading barge that segregates the NGLís into their individual components allowing for refined products to the required specification into a receiving pipeline or storage system.

LNG ship at sea

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