A Tug-of-War in the Oil Patch

Big oil could face pressure if Bolivia, Venezuela, and others take more control of their fields, but S&P is still positive on most stocks

Major oil companies, facing declining output from mature fields, have been finding it difficult to increase oil and natural-gas production for some time. That task could become even trickier as countries such as Nigeria, Venezuela, Bolivia, and Russia aim to take more control over their own production.

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