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ConocoPhillips is working to seal off the leak at its Alpine
field, the Alaska Oil and Gas Conservation Commission said in a
report, as it determined the gas volume lost in the leak
discovered a month ago that brought a cut in oil output.
Overall daily Alpine production fell to a low of 36,851 barrels
on March 13 from 51,700 on March 1 before the discovery, the
state's revenue department said, though latest figures show
output has since recovered to more than 50,000 barrels a day.
As site remediation work continues, Conoco said it was placing
cement in multiple steps to isolate the shallow geologic
formation identified as the source of the gas. Then it will plug
the source, the company said on its incident website.
Last week it also received a permit for seismic surveys of the
affected area, a drill site called CD1, the oldest in the Alpine
field on the western North Slope.
ConocoPhillips did not respond to a request for comment.
Discovery of the leak led to the temporary evacuation of about
300 of the roughly 400 workers at the field.
There has been no detectable gas outside the structures
enclosing the wells, though "fluctuating" low levels of gas have
been reported inside the wellhouses, the regulatory agency said.
(Reporting by Yereth Rosen in Anchorage, AlaskaEditing by
Clarence Fernandez and David Goodman)
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