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- W2015964654 abstract "Abstract The Statfjord Field is the largest producing oilfield in the North Sea. To date, 159 wells have been drilled, 35 of which have been sidetracks. To increase the recoverable reserves for the remaining slots, it was felt that multilateral completions would provide the best option since the targeted reservoirs were small, and thus, would have to be combined to provide economic feasibility. The multilateral concept is comparatively new, and as with all pioneering technology, each field experience can present scenarios that have not previously been addressed. This paper will discuss a problem that occurred during installation of well C-23. In this case, difficulties in cementing the area around the junction occurred. During later drawdowns, the junction partially collapsed, preventing fullbore access to the parent well bore. After the problems were noted, a unique testing process was developed and used to determine the circumstances that had caused the junction failure. Since the integrity of the multilateral concept is dependent upon the efficiency of the junction area, the test process was also used to provide a comparison of the strength ratios of supported and unsupported junctions and to observe lateral liner loading. The testing process succeeded in determining the cause of the C-23 problem and identified general requirements critical for maintaining integrity in the type of multilateral completion being used in the Statfjord Field. Since Statoil was planning two additional multilateral wells, it was particularly important to determine the reason for the C-23 difficulties so that a failure of this nature would be prevented in future wells. P. 265" @default.
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- W2015964654 date "1998-10-20" @default.
- W2015964654 modified "2023-09-27" @default.
- W2015964654 title "Unique Test Process Resolves Junction Difficulties in a Multilateral Completion on the North Sea Statfjord Field" @default.
- W2015964654 doi "https://doi.org/10.2118/50661-ms" @default.
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