Oil industry opportunities

Investing to companies in Northern America and Europe that are operating in oil industry. The main thing is that their revenue does not depend on oil price directly but of course they have suffered also because of it as the whole industry has suffered from low oil price. After my strict analysis I have found that these companies are healthy and I believe that they can manage trough this weak level of the markets. Oil industry has been challenging but It is still a markable Industry. The risks are big and these companies has been getting into debt (most of them) but also there is some sings of a change. It is impossible for me to say when the oil industry will start to recover but when it does, I believe that these companies can generate good profit to its owners. After all they don´t need a more expensive oil price to success, they just need oil production to success. I'll keep my eye on these companies and if some securitie becomes too risky I'll change the position to cash. Also I will keep on searching new opportunities and the total number of the securities will be from five to ten. Please feel free to comment and ask!