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Water Management Techbook 2017

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EPmag.com | May 2017 | 45 WATER MANAGEMENT: CASE STUDIES operators solve complex water issues, outperforming conventional methods (Figure 1). GES deployed a recycling plant for an operator in the Permian's Delaware Basin focused on treating produced and flowback water to reduce total water management costs for the field development. The treatment plant, operating since 2015, recycles pro- duced water to a reusable clean brine that can then be used for the drilling and completions program. The client's requirement was to recycle volumes up to 12,000 bbl/d and about 3.6 MMbbl/year for servicing multiple hydraulic fracturing jobs in the area. The application uses selective chemical extraction (SCE) technology, developed out of the Massachusetts Institute of Technology, incorporating a proprietary algorithm that can take the varying water quality of produced water and selectively dose chemicals in proper sequence and quantities to produce a consis- tent, higher quality effluent supply. The selective chemical dosing and sequence min- imizes the operating cost of the plant. Additionally, the treatment facility uses a patented clarifier design aimed at effective solid-liquid separation, sustainable at high rates of operation. This is an important tech- nological breakthrough, as it minimizes the solids carry to the downstream processes, such as fracturing operations and water storage, specifically tanks and pits. The performance of the clarifier eliminates the need for an expensive polishing step such as filtra- tion, which is a significant cost for a conventional water treatment process. The effluent water quality, defined by the operator for specific end use in the drilling and completion program included potential fracture designs of slickwater, zirconate and borate crosslinked systems. The liquid sludge was further processed to recover additional water and turn the sludge into a disposable solid cake to further reduce the disposal cost. One of the most important key performance indicators achieved during plant operations was the treated water recovery ratio, which was greater than 99.7%. This was a result of the innovative process flow design, which maximized the produced and flowback water reuse while minimizing the waste product. FIGURE 1. Current oilfield water treatment technologies provide a variety of options for cost-effective and safe reuse of wastewater. (Image courtesy of Gradiant Energy Services) Carrier Gas Concentration or CGC High Cost Disposal Locations Volume Reduction by Evaporation Produced Water Flowback Water Drilling Wastewater Rainwater Runoff Safe, cost-effective and environmentally friendly solution Convert wastewaster into vapor Low energy, mobile and deployable Separates heating from the physical evaporation Meet stringent particulate matter emissions requirements Selective Chemical Extraction or SCE Reusable Clean Brine Reuse in Fracturing Produced Water Flowback Water Drilling Wastewater Custom-engineered, multistep water treatment process Treatment of all types of wastewater Patented clarifier design for high-rate clarification Patented chemical addition algorithm Minimize waste generation Free Radical Disinfection or FRD Bacteria Disinfection Freshwater Produced Water Flowback Water Batch or On-the-fly Treatment Safe, environmentally friendly bacteria treatment Uses only salt, freshwater and electrical energy Generates mixed oxidant with multiple free radicals No hazardous chemical storage onsite Carrier Gas Extraction or CGE Water Recovery - Dischargable High-cost Disposal Locations Produced Water Flowback Water Drilling Wastewater Rainwater Runoff Low-cost desalination technology using air as a carrier gas Extract water vapor from wastewater Water recovered through dehumidification process 50% less energy usage compared to mechanical vapor recompression

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