I have zero issues with oil and gas workers. I used to work in that industry and have liberal friends and relatives still working in it.
But he pledged to decline large donations (over $200) and from oil executives and he should have worked harder to meet it.
His campaign finance people should have known, since they're the ones who file the Campaign disclosures.
https://readsludge.com/2018/12/10/beto-orourke-oil-and-gas-contributions-2018/
So two dozen.
Again, I don't think it's a big deal.
I just think someone should be called out when they break a pledge. (Like Bernie's dreaded tax returns.)
Don't make a promise you can't keep.