This is the private survey. The U.S. Energy Information Administration will announce official figures on (US time) Wednesday at 10:30 a.m. EDT
The private survey results are given to subscribers to that service at 4.30pm NY time
They are not published publicly but often leak out over social media and newswires
That drawdown reported is higher than the median analysts' expectation of a 435,000 barrel decline (Reuters poll).