I enjoy and appreciate your posts as they are usually quite informative and extremely practical, so I am loathe to disagree with you. In this case, I think you are thinking about this incorrectly.
If the system is a true closed loop, you are not pumping water up from the depths as in a drinking water well, you are moving water around a wheel. That is, every gallon coming up is counterbalanced by a gallon going down. The only head the pump has to overcome is the frictional resistance in the pipe, not the height of the column.
In my area (NW IL) I have seen geothermal systems both drilled and trenched, usually decided by the subsurface conditions. On my property, I think it would be difficult to dig 600' of trench 6' deep without dealing with large rock formations.
As to pressurizing the system, I think that pressurization of any hydronic system is a really good idea largely because it makes oxygen much less of a factor in system wear.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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