Exxon Mobil Corporation (NYSE:XOM) announced that its subsidiary, Exxon Neftegas Limited (ENL), has completed drilling of the Z-11 well, the longest measured depth extended-reach drilling (ERD) well in the world. Located on Sakhalin Island offshore Eastern Russia, the record-setting Z-11 achieved a total measured depth of 37,016 feet (11,282 meters) or over seven miles.

The multiphase Sakhalin-1 Project includes the Chayvo field which is located 5 to 7 miles (8 to 11 kilometers) offshore. The Z-11 was drilled to the Chayvo reservoir from the Yastreb rig, the world’s largest land-based drilling rig. Overall, the Chayvo field reached its peak production rate of 250,000 barrels (34,000 metric tons) per day in February 2007 after an on-schedule startup in October 2005. The Z-11 is the 17th ERD producing well to be completed as part of the Sakhalin-1 Project. It was drilled in 61 days, more than 15 days ahead of schedule and below expected cost with no safety or environmental incidents.

.....

Full version of the article can be downloaded here.