I'm wondering about which is best for hydraulic fracturing, slickwater or gel? Is it that one is better then the other for particular rock formations? For example is it more common to use a gel frac in the Niobrara, and a slickwater frac in the Permian? (or vice versa).
What other pros and cons are there. How do the numbers add up on pricing, is one better for the machinery,equipment or environment?