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The “E” in ERD, (Extended Reach Drilling) will eventually stand for “extreme.” ER wells test the limits of technology and require considerable modeling on the technical feasibility of well construction. A recent Offshore Technology Conference session brought together the latest thinking on extended-reach drilling. This is mostly a synopsis of that session.
Perhaps the best way to present the session is to break it down into the various components of conventional well construction: planning, rig selection, mud requirements, drillstring, casing, cementing, logistics and HSE considerations.
THE DRIVERS AND LIMITS
Drilling the world’s longest extended reach well gives a company a reputation for being on the cutting edge. That, and bragging rights. This is the case with the recent new world record extended reach well, the Z-11 on Sakhalin Island. Drilled into Chayvo field by ExxonMobil (Exxon Neftegas Ltd.), the well, at 37,016 ft, has the longest MD of any ER well.
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