ABSTRACT:

The paper introduces the technical and structural developments of artificial islands construction in the oilfields of China beach-shallow sea areas in the past 20 years. The results indicate that artificial islands tend to develop to be the offshore structure as multi-purpose, (e.g. drilling, oil production, offloading, water injection etc.), high standard, high safety, variable as costal circumstances and geological conditions, diversity in structures, decreasing in maintenance cost, disassembly, removal and/or re-usable conveniently after service ended etc. Combined with different environmental and natural conditions, the paper also describes selection aspects of various alternatives for constructing artificial island in coastal and shallow water areas. A variety of matters need to be considered in artificial island construction and employment have been emphatically discussed in order to improve construction quality, deduce the project cost, shorten working time at sea and prevent circumstances pollution. Several typical design, construction and operation of artificial islands in Liaohe and Dagang Oilfields are chosen as the study cases, such as their structure shape, comprehensive function, soft groundwork, construction technology and safety precautions etc.

INTRODUCTION

It is more and more important to develop oil and gas in ocean and beach-shallow sea areas because the energy resources have become increasingly exhausted on land. However, due to the tidewater and its awful influence in beach areas, the barge can hardly position close to the target of oil well site. It is proved by practice that constructing road into the sea and artificial island is a feasible method to exploit oil and gas along the coast. Artificial islands have been constructed along with the development of petroleum exploration and production for more than 90 years. It is clear that by means of artificial islands, to carry through drilling and oil extraction is of many advantages both technologically and economically.

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