The influence of geotechnical engineering on the evolution of offshore structures in the North Sea

Abstract

The selection of the type of drilling or production platform appropriate to a particular off shore site depends, chiefly, upon the likely severity of the marine environment, the nature of the seabed, and the geotechnical properties of the underlying soils and whether there exists a requirement for on-site oil storage. Although these physical factors have all played important roles in shaping the evolution of offshore structures, particularly in the North Sea, economic considerations and the national preferences of client companies have on occasion been decisive.This paper traces the evolution of offshore oil production structures for the North Sea with particular emphasis on the role played by geotechnical engineering during the conception, design, and construction of some of the largest movable structures in the world.

Research of lightning transient potential on the jacket foundation offshore wind turbines

“…When the offshore wind turbine is struck by lightning, the lightning current usually flows through the blade, tower and jacket foundation. Jacket foundation is soaked in the seawater, and the resistivity of seawater is far less than that of soil [14]. The seawater has a beneficial influence on dissipating the lightning current, so offshore wind turbines usually utilize jacket foundations as the natural grounding bodies.…”

A modeling analysis of grounding resistance and sea surface potential on the jacket foundation offshore wind turbines

“…Jacket foundation is soaked in the seawater, and the resistivity of seawater is far less than that of soil. The seawater has a beneficial influence on dissipating the lightning current, so offshore WTs usually utilize jacket foundations as the natural grounding bodies [4]. The grounding resistance and sea surface potential of jacket foundation need to be closely concerned in the electrical design and protection.…”