by Pops » Wed 30 Jul 2014, 08:19:48
$this->bbcode_second_pass_quote('Plantagenet', 'I')s there really any doubt in your mind that horizontal drilling and fracking will someday be used in other areas around the world?
Horizontal drilling is the real technological marvel. I'm sure there will never be a return to vertical drilling, mainly because we're running out of nice, tidy, concentrated, pressurized pools of oil. A vertical well makes contact with a thin layer of oil bearing rock for only the thickness of the layer while a H. well can follow that layer for miles in contact with the oil all the way.
more on h. drilling
But fracking isn't a feature, it is a requirement. The proppants (sand) in frac fluid are
necessary for horizontal drilling and do several things but first and foremost they prop open the sides of a horizontal wellbore that would be crushed tight otherwise. A horizontal well is subject to the same pressure from the sides that a vertical well is but also to the weight of all the rock above - there is no rock "above" a vertical hole. That vertical weight can be several times as large as the lateral pressure. Not only that but the pressure right at the wellbore is magnified as all that weight "transferred" around the hole - just like an archway in a rock wall. Without proppants injected under high pressure, the increased pressure right at the side of the bore closes up the pores in the rock adjacent to the horizontal well and nothing flows.
more on frac'g and h. drilling at TODBut there's more. Shales are compressed mud, as they were compressed they developed vertical fractures. Vertical wells obviously can only cross a limited number of those fractures but horizontal wells can cross many. Horizontal wells then take advantage of the natural fracturing in the shale.

But then here is the thing, a horizontal well
uses the natural fractures (propped open by frac fluid proppants) but what happens if there are too many natural fractures and the frac fluid escapes? Or the extractable 'oils" themselves have already escaped? Or what if there aren't enough natural fractures? Or the oil bearing layer has been folded too tightly by tectonic forces to follow? And, or, the target layer is interrupted by a more porous layer like sandstone? Or what if all the lightweight, fracable "oil" that was created in the layer has already migrated, leaving behind the heavier fractions that just are too big or too sticky to flow?
That is the thing overlooked. People see a map of shale like was posted earlier and think simply because it is shale that is the right age and was at the right depth and had the right dinosaurs tromping around it once that the fracers will just go in there and frac it and miraculously set all that trapped oil free. But it doesn't work that way, there are just a narrow set of conditions that make it work - I think that the fact all those other shale plays aren't producing much is proof. All those other shales aren't Bakkens and never will be, IMO.
I'm not going to say I was on the verge of becoming a hor. drilling, hydrofracing booster before the EIA said "Never Mind" on the Monterey. In fact, I "think" the economics are shaky and free government money looking for a home is what may be keeping lots of LTO afloat right now. But the fact that the EIA and USGS hired people who make money from the business to draw all those pretty maps without any real investigation makes me much more skeptical.
Didn't the mortgage scams teach us that "independent" guarantees (paid for by industry) are nothing more than PR Fluffing?
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The legitimate object of government, is to do for a community of people, whatever they need to have done, but can not do, at all, or can not, so well do, for themselves -- in their separate, and individual capacities.
-- Abraham Lincoln, Fragment on Government (July 1, 1854)