Related by context. Frequent words. (Click for all words.) 63 fracing 61 frac fluid 61 reinjection 60 hydraulic fracturing 59 fracking fluid 58 fracking 56 frac 55 COGCC 54 flowback 54 Fracking 53 injection wells 53 dewatering 53 sorbents 52 drilling 52 fracs 52 fracking fluids 52 Hydraulic fracturing 52 groundwater remediation 52 frac sand 52 fracture stimulation 52 horizontal drilling 52 subsurface 51 brine 51 extraction 51 wellbore 51 frack 51 hydrofracking 50 degassing 50 wells 50 contaminating groundwater 50 directional drilling 50 depositional 49 wellbores 49 evaporation ponds 49 chlorinated solvents 49 Carbonate 49 drillers 48 sumps 48 hydrogeological 48 leaching 48 desorption 48 denitrification 48 heap leaching 48 H2S 48 groundwater extraction 48 Leaching 48 drilling fluids 48 dewater 48 Dewatering 48 fracture stimulated 48 Fracturing 48 proppant 47 cased hole 47 downhole 47 resampling 47 overpressure 47 chloramine 47 groundwater 47 recompleted 47 CO2 sequestration 47 contaminate groundwater 47 pretreatment 47 perchlorethylene 47 MtBE 47 coal slurry 47 soil borings 46 chlorine dioxide 46 Subsurface 46 wellfield 46 dewatered 46 SAGD 46 coalbed methane 46 gravity drainage SAGD 46 Hydrogen sulfide 46 EOR 46 membrane filtration 46 hydrocarbon 46 fracked 46 shale 46 microfiltration 46 dissolved solids 46 sulfide 46 total dissolved solids 46 stage fracture stimulation 46 Carbon sequestration 46 polluted groundwater 46 heap leach pad 46 Vermillion Basin 46 biogenic 46 aquifer recharge 46 slurry 46 biodegradation 46 hydrogeology 46 cavitation 45 abiotic 45 sorbent 45 evaporative 45 perc 45 geochemical analyzes 45 remove impurities 45 brines