Coordinated optimization, new well design reduce wellbore stability problems in Valhall field

Teamwork and field-specific operational practices adopted for the Valhall field, Norwegian North Sea, helped limit wellbore instability, lost circulation, and stuck-pipe problems.Knowledge-management tools and processes were used to refine these procedures over 24 months, implementing a new well design and 113/4-in. liner surge-reduction techniques. As a result, dry hole days/1,000 ft improved by about 40% in wells drilled at an inclination of 50º through the overburden. The primary goal of setting 95/8-in. casing in the reservoir was achieved in six wells, whereas previously failure to set casing was common.SubsidenceThe Valhall field, in Block 2/8 of the Norwegian sector of the Nor...

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