From the EIA:

EIA’s Petroleum Supply Monthly, published on January 30, includes crude oil production estimates for Oklahoma based on EIA monthly survey data. The new estimates are roughly 100,000 barrels per day more than those generated by the previous EIA methodology, which was informed by state-reported data.

The recently expanded EIA-914 survey collects oil production data from the largest oil producers in 15 states (including Oklahoma), the federal Gulf of Mexico, and the remaining states as a group. Estimates based on the expanded EIA-914 survey, which had previously been implemented for other states, replaces an earlier methodology that relied on data collected by states. In states with predictable lag times and revision patterns, estimates based on the 914 data and the earlier methodology were quite similar. For these states, EIA shifted to the directly sampled 914 data earlier in 2015.

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