PLANNING AND EXECUTION OF A 500 M COREHOLE THROUGH OFFSHORE PERMAFROST
The saline permafrost that extends offshore under the Canadian Beaufort Sea is in a delicate state of equilibrium. Conventional production of warm oil through these soils would cause thawing. This thawing would result in excessive axial and bending strains within the well casings and system componen...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.566.5260 http://pubs.aina.ucalgary.ca/cpc/CPC5-271.pdf |
| Summary: | The saline permafrost that extends offshore under the Canadian Beaufort Sea is in a delicate state of equilibrium. Conventional production of warm oil through these soils would cause thawing. This thawing would result in excessive axial and bending strains within the well casings and system components. Relatively continuous core is required to evaluate the extent, native and engineering properties of the permafrost interval. This information will be used to determine the effects of permafrost thaw on casing system components. This paper describes the operational aspects of the 1988 offshore permafrost coring program conducted by Gulf Canada Resources Ltd. The objectives of this program were to collect site-specific data, determine correlations between geophysical and geotechnical parameters, and develop techniques which could be applied to oil-well drilling. Through the development and application of state-of-the-art drilling and sampling technology, these objectives were met. Future papers will discuss the geological and geotechnidal aspects of this project. Le pergdlisol salin qui s'6tend au large sous la mer de Beaufort au Canada se trouve dam un Ctat d'bquilibre fragile. Un mode de production classique de p6trole tikde B travers ces sols provoquerait un d6gel. Ce d6gel produirait des d6formations axiales et de flexion excessives dam les tubages de puits et les |
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