Offshore: Change in drilling strategy brings string of efficiency milestones to Troll

Groundbreaking drilling procedures and technologies have played a vital role in transforming Norway’s Troll field from a profitable oil-containing gas province into one of the North Sea’s largest oilfields. Among the most important technology that led to the success of the Troll oil development has been rotary steerable systems (RSS) with sensors near the bit. RSS technology has been a key enabler of precise placement of horizontal wells in thin reservoirs such as the oil-bearing ones in Troll. Advances in formation evaluation and drill bit technologies are now extending the value of RSS-enabled drilling to record-setting, single-bit runs that are significantly improving well efficiency and economics in the mature field. To maintain maximum oil production and avoid any premature gas breakthrough or water coning, wells are drilled at a controlled trajectory within 1.5 ft (.45 m) above the oil/water contact (OWC). Any departure from this position reduces the maximum possible reservoir coverage. Over time,…



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