It's typically considered not worth it collect methane from oil-producing wells, even though it comes out in such volume that it needs to be appropriately vente

It's typically considered not worth it collect methane from oil-producing wells, even though it comes out in such volume that it needs to be appropriately vented and flared (burned) which is why you can see burning torch-like pipes out in the middle of nowhere all over oil producing areas. Given that is much more concentrated than thousands of kilometers of bogs and tundra, the odds of this being practical, much less profitable, are basically zero.