Related by context. Frequent words. (Click for all words.) 63 sludges 63 frac fluid 62 fracturing fluids 60 fraccing 59 reinjection 59 pentane 58 Sulfuric acid 58 drilling fluids 57 absorbents 57 sandstone reservoir 57 sorbents 57 chlorinated solvents 57 silts 57 diatomite 56 Contaminated soil 56 hydrocarbons 56 corrosives 56 desalting 56 Reverse osmosis 56 fracking fluid 56 flowback 55 contaminating groundwater 55 fracture stimulations 55 lubricating oils 55 corrosive acid 55 elemental sulfur 55 toxic solvents 55 clastic 54 oxidising 54 BTEX 54 Sediments 54 proppant 54 absorbent materials 54 benzene toluene 54 insitu 54 fracing 54 frac sand 54 sorbent 54 evaporation ponds 54 inorganic compounds 54 solvents 54 feedwater 54 aromatic hydrocarbons 53 H2Omaxx 53 wellbore 53 Marmaton 53 sorption 53 hydroxyl radicals 53 petroleum distillates 53 fracking fluids 53 drill cuttings 53 saltwater disposal 53 adsorbent 53 hydraulically fractured 53 Hydrochloric acid 53 kerogen 53 granulate 53 Hydrogen sulfide 53 subsurface 53 potassium hydroxide 53 cased hole 53 THAI TM 53 tailing ponds 53 atmospheric pollutants 53 iron oxides 52 Hexavalent chromium 52 dissolved solids 52 oily residue 52 remove impurities 52 chlorides 52 polluted groundwater 52 acid leaching 52 methylene chloride 52 hydraulic fluids 52 heap leach pads 52 degassing 52 Kuan Yin Taiwan 52 sumps 52 hydrothermal fluids 52 spillages 52 combustion gases 52 seepages 52 bio remediation 52 Snøhvit 52 contaminants 52 Horizontal drilling 51 ° API 51 hydrogen chloride 51 wastewater effluent 51 Leaching 51 superheated steam 51 wellbores 51 Septic tanks 51 Glycol 51 fluorocarbons 51 sulphates 51 Sulfur dioxide 51 flyash 51 groundwater remediation 51 porosities 51 ammonium chloride