United Kingdom: Through tubing rotary drilling successfully applied in North Sea well ///
In June 2002, Shell re-entered one of its North Sea wells using Through Tubing Rotary Drilling (TTRD) to drill a 412-in. drain hole into the Brent sands. Shell had predicted that slide drilling in the depleted Brent sands would be difficult, and had decided to assess a number of technologies to optimize future TTRD campaigns. One of the technologies to be assessed was the 3-3/8-in. Andergauge AG-itator, a drilling tool designed to reduce static friction of the bottomhole assembly (BHA), and improve weight transfer to the bit when sliding a conventional oriented motor.
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