What takes the place of oil in a well when it has been pumped out?

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Offline thedoc

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Harry Dawes  asked the Naked Scientists:
   
Hi Chris

I listen to you on Friday mornings with Redi but couldn't get my question in and it has bugged me for many years: What takes the place of oil in a well when it has been pumped out, also gas?

Hoping for an answer

Harry Dawes

What do you think?
« Last Edit: 15/06/2012 11:30:02 by _system »

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Offline evan_au

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Oil and gas are often trapped in porous rock between non-porous rock strata (above), and subterranean water (below).
As the oil and gas are removed, the water flows into the porous rock.

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Offline JimBob

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In unusual cases, oil and the water migrated into reservoirs actually cause subsidence of the surface due to the unconsolidated and semi-consolidated sands forming the reservoir becoming compacted as a result of the loss of the water partially supporting the solid sand grains. The city of Houston, Texas has a large part of its road repair budget devote to fixing the linear cracks due to faults of 5 inches or more that have developed.
The mind is like a parachute. It works best when open.  -- A. Einstein

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Offline Ophiolite

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In the case of Phillips Ekofisk field inthe North Sea the subsidence was of the order of several metres: http://en.wikipedia.org/wiki/Ekofisk_oil_field
Observe; collate; conjecture; analyse; hypothesise; test; validate; theorise. Repeat until complete.

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Offline CliffordK

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