These were drilled from existing slots, with an average price of NOK 170 million ($20.5 million).
Wells, C-2, C-3 and C-4, have boosted output from the facility by 30%, the company added.
Oddmund Rismyhr, acting head of Snorre Petec, said: “We estimate the price per barrel for these wells to be well below $10.
“Snorre B is currently producing around 80,000 b/d, which is a very satisfactory result…We have found the right drilling targets for our wells, and when we add a predictable and long-term drilling plan allowing optimization and higher efficiency, we have the success factors.”
According to Johan Dahl, head of D&W planning, the poor condition of the slots led Statoil to adopt a simplified casing design for one of the wells. To cut costs, the company also implemented a standard, simplified completion design for all the wells with the same type of drilling fluid in each case to allow re-use.
In addition, managing the operations – drilling, lower completion, upper completion and christmas tree setting – in series for the three wells saved rental time and resources.
“If we drill only one well, we must rent equipment and send it back to shore, while the remaining completion equipment and drilling fluid must be sent to shore when we are done,” Dahl explained.
“At the same time we learn a lot from each well, which is reflected in the reduction in time spent on sub-operations during the process.”
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