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Scoop-Stack Playbook 2017

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SCOOP/STACK: TECHNOLOGY 26 | September 2017 | that stack on top of each other. In each of these benches, we have to decide how many wells it will require to effectively process the reservoir. It becomes a 3-D question for us. A lot of what we're trying to figure out is how to process the reservoirs using the least amount of money. We're learning a lot about not only the lateral communication between the wells but the vertical communication between the different intervals. From a subsurface standpoint, we've put a lot of technical work into understanding that." To that end, Devon has formed an Integrated Reservoir Characterization team with the pur- pose of pulling together different disciplines and integrating the volumes of data collected from various tools that assist in painting the true pic- ture of the reservoir. "The vertical-data well is key," explained Kyle Haustveit, completions engineer in the region for Devon. "It's one of the most useful tools in understanding what our stacked pay potential is and where to land our laterals to effectively drain the resource and avoid stranding reserves. We inte- grate the vertical-data well understandings with a fiber-optic job, where we strap a fiber-optic cable to the outside of our casing to obtain a real-time view of where our proppant and fluid are being placed during the stimulation. Optimizing the completion is going to improve our drainage area and improve our individual well and infill performance." In addition, Devon is using electromagnetic imaging to map both the fluid and proppant geom- etry, offering a 3-D volume view of where the oper- ator is placing its fracturing fluids. The company also is using conventional off- set pressure monitors in new ways. The goal is to integrate offset pressure responses with addi- tional technologies and learn how to apply them in units without fiber optics or without a verti- cal-data well and continue to improve comple- tions in real time. With Devon and its peers ramping up activity in the area, concerns over required volumes of sand and water start to arise. Devon alone is now running 2,400 lb or so of proppant per lateral foot. In a 10,000-ft well, that could mean pumping 24 million to 25 mil- lion pounds of sand, and it takes about 500,000 bbl of water to fracture one well. When talking about 25-well programs, the numbers escalate exponentially. For sand, one of the things Devon has done to help defray cost on the supply chain side is shifting away from using full-service fracturing companies. They are de-bundling these offerings to find the best deals direct from sand suppliers, pumping companies, diesel distributors and so on. "Obviously the sand and water supply chain is critical for our certainty of execution," Moehlen- brock said. "We're working to secure the water sources, and we've got some good leads on that. We're also building infrastructure in the field— basically million-barrel ponds that we can use to store our frack fluid. We'll have a series of these around the field and then a network of piping that will allow us to move water around the field as needed. We're being very thoughtful about the volumes we need and how to get those volumes on location for the cheapest cost. We're also looking at our produced water and plan to recycle and reuse that water to help with the frack supply side. Unlike the Delaware, where the water rates and ratios are fairly high, it's much lower in the Stack and Meramec. Approximately 30% of total fluids are water. It's much less than some other plays. We'll also have procedures and infrastructure in place to dispose of any water we don't plan on reusing for fracking." Targeting water needs For an area that has limited groundwater sup- plies plus a known history of drought, sourc- ing adequate water supplies to meet demand for planned increased drilling activity is a chal- lenge for the industry. That is what faces many operators with programs on tap in the Scoop/ Stack play in Oklahoma. Sometimes the natural resources—lakes, ponds, etc.—cannot fulfill the need if the rain has not been delivered by Mother Nature. That uncertainty, coupled with forecasts of increased use across the region, has companies like Newfield Exploration looking for alterna- tives. In March the operator broke ground on a water recycling facility located in its Stack play in the Anadarko Basin (Kingfisher County, Okla.). The complex, named the Barton Water Recycling

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