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What fills the void when oil and gas are abstracted?

Vast amounts of oil and natural gas are abstracted each day from the earth’s crust, what fills the void thus created?
Robert Serman from Surrey (Age 55+)

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One Response

  1. In most cases when oil is extracted from rock at depth underground it is replaced by water. Gas may be replaced by either oil or water. The influx of water from adjacent strata helps to drive the hydrocarbon (oil and gas) out of the reservoir rock and into the bore hole. Understanding the behaviour of one fluid type displacing another through the connected pore spaces of a reservoir rock is critical to maximizing the percentage of hydrocarbons that can be extracted. If the pressure in the reservoir can not be maintained by other fluid flowing in to replace what has been taken out, the reservoir rock may compact as the pressure difference is taken up be the solid framework of the rock – in a similar way to what happens when sucking fruit juice through a straw out of a small fruit juice carton will cause the carton to contract.

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