Two North Sea extended reach wells have been analyzed in detail by comparing downhole pressure and temperature measurements with results from an advanced pressure and temperature simulator. Drilling of 12 ¼ in. and 8 ½ in. sections are studied.

Early indications of hole cleaning problems were observed both on temperature and pressure. Calculations predict that downhole temperature is very flow regime dependent, and flow regime depends on eccentricity of the inner string, which therefore is important to take into account. It is also demonstrated that the presence of tool joints may influence temperature dramatically.

Improvements in the planning and modeling of the drilling of extended reach wells are suggested.

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