Energy Security, National Security #1Posted on November 24th, 2015 No comments
Our assiduous government in the United Kingdom has conducted a national security review, as they should, but it appears the collective intelligence on energy of the Prime Minister’s office, the Cabinet Office and the Foreign Commonwealth Office is on a scale of poor to dangerously out of date.
No, LNG doesn’t stand for “liquid natural gas”. LNG stands for Liquefied Natural Gas. I think this report has confused LNG with NGLs.
Natural Gas Liquids, or NGLs, are condensable constituents of gas-prone hydrocarbon wells. In other words, the well in question produces a lot of gas, but at the temperatures and pressures in the well underground, hydrocarbons that would normally be liquid on the surface are in the gas phase, underground. But when they are pumped/drilled out, they are condensed to liquids. So, what are these chemicals ? Well, here are the approximate Boiling Points of various typical fossil hydrocarbons, approximate because some of these molecules have different shapes and arrangements which influences their physical properties :-
Boiling Points of Short-Chain Hydrocarbons
Methane : approximately -161.5 degrees Celsius
Ethane : approximately -89.0 degrees Celsius
Propane : approximattely -42.0 degrees Celsius
Butane : approximately -1.0 degrees Celsius
Pentane : approximately 36.1 degrees Celsius
Heptane : approximately 98.42 degrees Celsius
You would expect NGLs, liquids condensed out of Natural Gas, to be mostly butane and heavier molecules, but depending on the techniques used – which are often cryogenic – some propane and ethane can turn up in NGLs, especially if they are kept cold. The remaining methane together with small amounts of ethane and propane and a trace of higher hydrocarbons is considered “dry” Natural Gas.
By contrast, LNG is produced by a process that chills Natural Gas without separating the methane, until it is liquid, and takes up a much smaller volume, making it practical for transportation. OK, you can see why mistakes are possible. Both processes operate at sub-zero temperatures and result in liquid hydrocarbons. But it is really important to keep these concepts separate – especially as methane-free liquid forms of short-chain hydrocarbons are often used for non-energy purposes.
Amongst other criticisms I have of this report, it is important to note that the UK’s production of crude oil and Natural Gas is not “gradually” declining. It is declining at quite a pace, and so imports are “certain” to grow, not merely “likely”. I note that Natural Gas production decline is not mentioned, only oil.
…to be continued…
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