You start searching records here:
Records are by pun, but you have to search each individual document. It is not an easy task. In some cases you can find where the operator has sold other wells nearby and see who the purchaser was. Start by searching on production on 01/2018 to get an idea.
If Newfield reports directly it will be under 20944
Here is the sample from 01/2018
In some cases they will use a buyer for initial production and the numbers will show up under another. It is common for Newfield to use Phillips which is 22985
So in this document you can see that well reported 9851 Barrels in Jan
Looking in Dec we now find 9303 barrels.
No report yet for Feb.
I discount 1st months production and sometimes 2nd month. But 2nd month is a much better indicator. We just don't really know what is going on with the well without more information. I place very little weight in completion reports. The flow test are done before all of the frac water has flowed back and the engineers are still stabilizing the wells.
The method for finding all of this is mainly based on a lot of experience and some trial and error. It would take way to much time to cover. A search on this site may reveal more details from explanations I gave a few years ago.