Estimating Friction Reduction For Casing Operations in High-Angle Wells in The Arctic Region - A Russia Case History

The Yokhar Field in the Yamal Region of Russia is located within the Artic Circle and is a prolific oil, gas and condensate producer. Over the last couple of years the drilling envelope has been consistently stretched to high degrees of step outs (in excess of 5Km) and future plans are indicative of much higher step-outs with reaches in excess of 7Km. Figure 1 shows a typical well design with the intermediate casing set as shallow as 1400m MD whilst production casing is set right on top of the reservoir at over 5000m MD in most cases. Future wells are expected to have open-hole sections in excess of 5500m across the tangent sections whilst the drain-hole section may be pushed to as long as 1800m.

In this paper we look at the implication of results from several iterations carried out to evaluate the suitability of the friction model to ensure casing strings are landed at the appropriate depths. This is then compared to the actual data from test wells and against offsets where casing strings have been run in high angle wells through long open-hole sections. For these wells we compared the simulated hook loads with actual recorded data. The comparison provides an idea of representative friction factors for casing strings. Furthermore, the comparison of predicted versus actual data provides some indication on the impact of the centralizers on the effective friction factors whilst running the casing string

Presented at the SPE Arctic and Extreme Environments Conference and Exhibition, 18-20 October, 2011, Moscow, Russia. 

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