Pumping Blanket Fluid Down a Well in Solution Mining

[amcewensfarm]

I'm trying to determine the minimum flow rate required to ensure our blanket fluid makes it to the well cavern and does not come back up to surface. Say I have 1 cubic meter of diesel (density of 835 kg/m^3), and I'm pumping it down a pipe with a diameter of 0.0620014m. The pipe is full of water and I want to pump water at a fast enough flow rate to keep the diesel moving down the pipe for 1600m. I've calculated the buoyancy force and the weight of the diesel but I can't determine the minimum flow rate to keep the diesel from rising back up to the surface. Help Please!
Thanks.

 

[dcasto]

Well, it's a Prandel and frondo number calc, but, it the velocity is over 5 feet per second, that should help keep the fluids separated. The thing is, oil the oil will eventually get to the roof. Don't spare the oil, you wouldn't want issues with the roof and shoe.

 

[amcewensfarm]

Thanks for your reply dcasto. I assume you meant Prandtl and Froude? Anyways, that velocity sounds quite reasonable compared to what we're actually using right now. However, I need calculations and numbers to prove it. Were there any calculations behind that number or was that just from experience.

 

[dcasto]

It's amazing what apples spell checker does. I just tap and go.