I've read that OPEC lowering oil prices has nothing to do with staying competitive -- it's just Saudi Arabia trying to drive US shale oil companies out of business. It's basically dumping.
It's not dumping. They aren't selling below cost, and they aren't giving Americans price preference to abandon US tight shale. If Saudi Arabia cuts production, along with the rest of OPEC, they are paying to eliminate the glut. If the low price of oil reduces investment in the US, US production decline will pay to eliminate the glut.
This is a common theme in international economics. People take an antagonistic stance against mutually-beneficial trade with the US. We lean on them with the full weight of our economy, and we dare them to double down or to acquiesce. In some ways, this game is the reason oil is so expensive. First were the oil embargoes, countered with CAFE. Then we got into a currency fight with China, which the Chinese countered by traveling the globe to secure resources, though they didn't have the technology to exploit them. Ultimately, the global economy collapsed as commodities prices led to consumer weakness in the US. Nobody won, same story with the oil embargoes.
When it comes to oil geopolitics, the US and Saudi Arabia are on the same team. The US created CAFE 2025 to reduce the cost of oil and reduce our trade deficit. We have no plans to frack for another 50 years so we aren't going to complain if Saudi Arabia wants lower equilibrium price and higher marketshare. Besides, lower equilibrium price put immense pressure on our "friend" Putin, and it may force Iran and Venezuela to allow development by established petroleum corporations. Saudi Arabia and OPEC get more marketshare, the US gets cheap imports and we use fewer off them, China gets cheaper imports to fuel growth, Vlad gets disgraced, which could be more precarious than we realize.