(342j) Multi-Period Design of Shale Gas Supply Chain Network to Handle Temporal Variability in Wastewater Volume from Shale Gas Wells
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Computing and Systems Technology Division
Interactive Session: Systems and Process Operations
Friday, November 20, 2020 - 8:00am to 9:00am
Recently, many studies have been performed on the optimization of the long-term planning and development of shale gas supply chain network (SGSCN) [2]â[6]. However, few of them described the closing of existing wastewater treatment facilities and opening of new wastewater treatment facilities to account for temporal variability in wastewater produced during shale gas production [7]. If we permanently use facilities established at the beginning of the planning horizon, the insufficient capacity in some time periods may result in negative environmental implications, while the excessive capacity in later time periods may lead to detrimental impacts on economic performance. Thus, to find a good balance between these two conflicting objectives, it makes sense to consider the opening and closing of wastewater treatment facilities which should be determined at each time period based on the time-varying wastewater production volume.
Motivated by this consideration, we developed a mixed integer linear programming (MILP) model to integrate the planning of SGSCN and the dynamic allocation of centralized wastewater treatment facilities and onsite wastewater treatment facilities. The objective is to maximize the net present value while considering the benefit from opening and closing of the wastewater treatment facilities. Based on the MILP model, the major decisions are the schedule of hydraulic fracturing operations to satisfy the product demands, and the locations and capacities of the wastewater treatment facilities as well as their timings of opening and closing to handle the generated wastewater. The proposed SGSCN optimization model is implemented on an illustrative example by utilizing real wastewater production data from the Marcellus shale play, and the results demonstrate its advantages over the case using (conventional) permanent wastewater treatment facilities.
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