This paper presents new results that confirm the potential to solve the problem of offshore structural casing failure by the use of anodic casing consolidation by electrokinetic methods. The specific difficulties in applying electrokinetics to conductive marine sediment are addressed. Increases in bearing capacity and pull-out shear strength of between 100% and 400% were obtained, depending on the level of electrical treatment, for a San Francisco Bay silty clay in both freshwater and saline environments. Experiments performed on shallow clayey sediment samples from the Gulf of Mexico demonstrated that increases in bearing capacity of between 50% and 100% were attainable. The effect of the anode metal on the process has also been investigated, with copper appearing to offer the most benefits for potential offshore applications in terms of current requirement and ultimate shear strength achieved.
Theoretical and practical application guidelines for using electrokinetics to improve casing support in soft marine sediments
1998
7 Seiten, 13 Quellen
Conference paper
English
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