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Jason Liegois - Author's avatar

If energy is going to be as scarce as you say, it doesn’t seem like our AI use would be sustainable.

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Paul Blackburn's avatar

With regard to your statement about finding ways to “suck out the last drops of existing reserves,” I suggest reading the Science and Environmental Health Network’s report on Enhanced Oil Recovery (EOR) using carbon dioxide.

A large proportion of remaining oil in place is not in untapped oil fields but stuck in rock pores in existing fields and in the residential oil zones (ROZ) in deeper source rock. This oil can be extracted via heat or solvents/ surfactants. Heat from natural gas is too expensive and the amount of solvents needed at scale is massive.

Enter the U.S. oil industry’s current efforts to expand use of CO2 EOR, which in a supercritical form is an excellent solvent. The industry developed this tech in the 1970, but due to costs it has never produced more than 2-3% of US extracted oil. Industry reports identify two barriers to expansion: (1) limited availability of CO2 supplies, as geologic CO2 sources are limited and fully committed to existing CO2 EOR operations in western Texas and the Gulf Coast, and ; and (2) the cost of anthropogenic CO2. To exploit remaining oil in place and ROZ, the industry would need massive amounts of CO2 from anthropogenic sources, but carbon capture is too expensive, otherwise the industry would have been capturing CO2 for decades. So, public subsidies are needed to help pay for the costs of capturing CO2.

But, how to rationalize public subsidies for carbon capture? Ah yes, to mitigate climate change. In the U.S. the public subsidy mechanism is the 45Q tax credit that currently grants tax credits of $60/MT for CO2 used in EOR.

Now, the U.S. oil industry is lobbying hard for continuation and an increase in the U.S. 45Q tax credit. The 45Q tax credit is one of the few Biden “clean energy” tax credits supported by congressional Republicans and the Trump administration, and not for climate change mitigation purposes.

My point is that if the oil industry needs massive public subsidies to extract this remaining oil, isn’t this an admission that the industry knows it is becoming uneconomic?

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