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INFLUENCE OF SURVEY TOOL TYPE ON SLOTS SPACING IN MULTI-WELL PAD DRILLING
Abstract
Multi-well pad drilling originates from offshore drilling where the use of this method is dictated by the limited mobility of platforms. Onshore group location of the wellhead slots is used since recently. It was first used in the Rocky Mountains in the USA in 2004. Beginning is related to the commencement of hydrocarbon extraction from unconventional reservoirs in the United States. Exploitation of unconventional shale and tight reservoirs with vertical wells is economically unprofitable because it is not possible to achieve economically viable gas flow. In this case, directional wells with the final horizontal section are used. Group location of the wellhead slots allows for increasing the profitability of exploitation. The object of research was to define minimum acceptable distance between wellhead slots in multi well-pad depending on the type of survey tool. Authors designed computer algorithm based on ISCWSA Error Model for errors size estimation. As a conclusion, accuracy of different survey tools was compared and minimum acceptable distance between wellhead slots was calculated.
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