Somehow I don't think the gas is migrating down from the Canadian Shield.
The original article is lacking any supporting evidence. If there wasn't testing done on the the water prior to drilling, how can one make the assumption that the drilling caused the gas infiltration to the aquifer? Sure it is a possibility, but natural causes could likely be the culprit.
Well according to the Duke Study they are supposing gas is escaping through cracks in the well casing into the aquifer...Just gas mind you not frack fluid... Super high pressure can push gas out but not the fluid??? It pushes out down the hole for the frack but not up at the levels of the aquifer??
It is easier for gas to migrate through the fractures than water. Diffusion is the basic explanation. Particle size, fluid density, pressure drop, temperature, surface tension, ect all can play a role in fluid migration.
It doesn't matter. Generally speaking, if you consider the water and gas under the same conditions(pressure) the gas will migrate more easily. Fluid viscosity, density, particle size, and surface tension are the primary controls of the migration.
This is just a scratch the surface rundown based on accepted mathematical equations/models. This topic is quite complex and there is much more to it then what I have mentioned.
If the propant holds the fractures open to allow gas to escape after being fractured bythe water pressure would not the same propant hold the fractures in the casing open as well to allow gas and fluid to escape in the aquifer?? But only the gas escapes???
It isn't that water can't flow through the fissures. I think you are misunderstanding my point.
Gases will flow more easily than liquids at the same pressure through fractures in the casing or bedrock/shale. The gases will be displaced by the liquid during the fracking process, see diffusion.
Think of a 20 ounce pop bottle half full. Turn the cap just a touch and squeeze (put the contents under pressure). No matter how the bottle is oriented the available gases are released first. This is for the reasons stated above.
It isn't that water can't flow through the fissures.
That is my point.. Duke is not finding frack water in the wells just gas???
Fracking is going on at what 10,000PSI ? Certainly enough to fracture rock and well casing consists of two pipes each surrounded by cement where it goes through the aquifer. And this well casing cracked, the cement cracked the next steel casing crackied then the cement around that and only the gas escaped into the aquifer...
In your example...put a cap on the bottle and then put a pin hole in that bottle and squeeze.... See if only gas comes out