SAGD CO2 injection proposed

CO2 truckCO2 injection improves recovery in conventional oil reservoirs. Will it improve recovery in SAGD too?

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In one SAGD pair, this operator proposes to inject CO2 with steam. This reduces steam-oil-ratio (SOR) but also potentially increases bitumen swelling and recovery.

Get the application documents about this operator's CO2 injection scheme in his SAGD project from our self-serve web portal.

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Reduce SOR -> reduce cost

Reduction of steam-oil-ratio usually indicates a reduction of operating costs. Steam is a costly commodity to generate. When natural gas is very cheap, it might make sense to substitute it for steam as long as recovery doesn't suffer.

CO2 can be even cheaper than gas if it's harvested from boiler flue gas. In this way, CO2 may be a free injectant.

Not free CO2

But CO2 is not a free injectant for this short term pilot. During the test, the operator will buy CO2 from an Alberta CO2 supplier and have it trucked to site. This is a very expensive CO2 source.

CO2 causes oil to swell and increases pressure in the reservoir. CO2 swelling may also discrease bitumen viscosity although this operator doesn't claim this benefit.

CO2 benefits

The operator believes there are four mechanisms that trap CO2 in the reservoir. He lists them and maintains that this could be a good way to reduce greenhouse gases.

In this test, the operator hopes to quantify the mechanisms that trap CO2 in the reservoir. This could pave the way for CO2 sequestration in SAGD. We found this information using AppIntel.

CO2 downside

CO2 is corrosive when mixed with even small amounts of water. Corrosion may attack surface facilities and piplines, well heads, casing and tubing strings. The operator discusses CO2 corrosion attack in his application and how he will mitigate its effects.


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Tags: Thermal, Heavy Oil

Granger Low   28 Jun 2016



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This page last updated 28 Jun 2016.
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