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Oklahoma 2018

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OKLAHOMA: TECHNOLOGY 30 | November 2018 | hartenergy.com be the best operator in effi ciency and safety. One thing that we've applied, which has really helped us in last year's drilling program was actively mon- itoring our drilling parameters. That sounds really basic, but Apache has proprietary internally devel- oped software, which can be used to monitor real- time performance and compare with other offset wells in the area in real time at any given depth. Real-time offset well performance tracking, along with new bits and optimized bottomhole assembly designs has helped to reduce drilling times and make a step change in drilling operations. In com- parison with 2016 performance, we were able to reduce our drilling time by 25% to 40% in 2017 by implementing some of these basic but extremely effective techniques." Different formations require different bits. In some formations Apache felt it could be more aggressive and run longer cutters. When drilling takes place in some harder formations, the com- pany tends to go conservative and tries to preserve bits for longer runs. "We have to know our formations," Roy said. "We cannot improve our efficiency if we are not actively engaged with our geologists. They play a critical role on telling us where we are drilling and what kind of formation we are expecting. It's a holistic approach. Combining rock data and rock strength data that we get from sonic logs helps us to tailor our bit and bottomhole assembly design for different formations. One other technology that has helped us to reduce drilling cost is the rotary steerable. That has helped us in drilling the lateral or the curve efficiently in some areas and longer laterals in some other areas." Apache's completion design overall has changed over time, much like the competition. The operator was one of the fi rst to try increased proppant load- ing in the Scoop area. "Most other companies have moved in that direction if they are not there already with prop- pant loading," Roy said. "We have tried some dif- ferent cluster designs, but overall what we have seen is that our current design is working well and our fiber-optics diagnostics confirm some of the assumptions." Water, water everywhere Water sourcing, usage and disposal has long been a topic of much debate in Oklahoma. Studies linking area earthquakes to the overuse of disposal wells have led to a greater amount of recycling produced water for reuse or rerouting it from the region. The state's own Water for 2060 initiative aims at using no more water in 2060 than was being used by the state in 2012. "I think we are probably one of the leaders in Oklahoma," Gould said. "We probably have the largest water recycling facilities in the state. We've got the throughput capacity of 100,000 barrels of water per day. In 2017 about 30% of our water that we used for completions was recycled or pro- duced water. Since we have concentrated operating positions, whether it be in Stack or Scoop, about two-thirds of our produced water is handled by company-owned assets. We try to be a good steward of water with everything we do." Chaparral is in negotiations with a third party to sell its water infrastructure, including lines and disposal wells in the region. The unnamed com- pany would take over the operations and continue to build out the system, while allowing Chaparral to operate at a fi xed price. "Our long-term goal would be to have a gatherer of all of the produced water and have it in a sys- tem large enough [so] when we are ready to drill or complete a well, we can blend the produced water with freshwater to get the right chemical mixture for the stimulation jobs," Chaparral's Miller said. "Ultimately, we want to be able to use 100% of our produced fl uids depending on the cleanup cost." For its water needs, Apache has struck unique deals with townships in other regions, such as Col- lege Station, Texas, where it contracted to use the city's wastewater as part of its water requirements in the Eagle Ford. "We have been lucky with our location and water sourcing in Oklahoma," Apache's Roy said. "On disposal, we don't have a continuous program where we are moving from section to section and could recycle our fl owback and produced water and pump it into our new wells. That is our goal. Even- tually we want to get there, but it is going to depend on capital allocations." Q

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