What fills the void we leave after oil extraction?

Question

And what effect does this have on our environment, global warming, etc.?

Answer 1

Hi. Water or steam is pumped into the well to 'float' the oil to the top, I believe. http://www.fossil.energy.gov/education/energylessons/oil/

Answer 2

Sometimes nothing fills the void.

Sometimes companies pump high pressure salt water down the well, to force more oil to the surface. They leave the salt water down there.

Just leaving an empty oil well, or one filled with salt water has little impact on the environment -- in of itself.

After wells run dry, sometimes they cap the wells off with concrete, but that's not always the case.

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I answered you question as it was worded, but...
THIS might be what you are looking for:

When they DRILL a new well, laws require that concrete (grout, actually) lines the walls of the well hole wherever drinkable water exists underground, to seal the drinking water off from contamination.

Example: the oil well is 2000 feet deep, but there is drinkable water at 200 feet. The drill company drills down to 300 feet and pumps grout into the hole, lining it. They wait for it to dry, then they continue drilling down to the oil at 2000 feet. When the oil comes up, it won't get into the drinking water supply.

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Answer 3

Some believe that Earth actually produces Oil. It is not a fossilized fuel and wells in Long abanonded Texas Oil fields are filling up again

Answer 4

depends on the oil reservoir. usually oil is trapped in interstitial spaces that are essentailly gaps in sand/rock. usually they are not completely emptied, but in any event, those gaps remain, but may later be filled with sub-surface water. no effect either way on momma earth

Answer 5

It is filled with salt water ,and there is no green house gas.

Answer 6

raw sewage I think

Answer 7

SIN!!!