The conventional wisdom recently has been that North America will keep producing shale oil for some time despite the higher costs associated with hydraulic fracturing and the 50 percent drop in oil prices over the past eight months. The thing about conventional wisdom is that it tends to be challenged, sometimes successfully. And shale’s biggest producer in the United States, EOG Resources Inc., is saying the recent rapid growth in its own shale production will end this year. And this idea is supported by people with experience in oil. Certainly,…