Using oil and gas as an energy source is a remnant of old Industial Age technology and not normally part of our discussion of the developing Global Age. However, the increased price of fossil fuels, resulting from the world’s diminishing oil supply, has led to some extraordinary techniques being used to extract oil and gas from ‘unconventional’ sources. These techniques seem to have been shrouded in confusing jargon and emotional claims.
In this post, I have attempted to set out my understanding of techniques such as fracking and coal seam gas extraction in plain language.
Researching these techniques has led me to be more convinced than ever that extracting unconventional fossil fuels is not the way of the future – even leaving aside the merits, or otherwise, of using these fuels.
The FAQs
What is fracking?
“Fracking” – short for hydraulic fracturing – is a technique of fracturing rocks with high a pressure fluid. It is mostly used for extracting tightly held hydrocarbons from rock formations.
What are “tightly held hydrocarbons”?
Sometimes oil, natural gas and water occur in underground reservoirs and will flow to the surface if the reservoir is tapped. But often the oil, gas or water is in tiny cracks or fissures in rocks, like shale, or in coal beds. These are called “unconventional reservoirs”.
If you drill into these unconventional reservoirs, only a small amount of the fluid, from near the bore hole, will come to the surface. One way of getting more fluid is to make cracks in the rock. The fluid will seep into the cracks and then into the bore hole.
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