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Hydraulic Fracturing Techbook 2018

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92 | August 2018 | hartenergy.com HYDRAULIC FRACTURING: CASE STUDIES In general, the shorter stages exhibit higher late scandium-traced proppant counts, while the longer stages exhibit better stage containment. All of the stages reveal excellent cluster treatment efficiencies and near-wellbore proppant cover- age. The shorter stages averaged 4.7 bbl/min per perforation, while the longer stages averaged 4.3 bbl/min per perforation. In both cases, there was ample rate to ensure effective limited-entry frac- ture f luid and proppant distribution. Figure 3 depicts the traced proppant placement for each stage on the underside of the Wolfcamp lateral (Well 1) and the fracture-fluid-flowback results (chemical tracers) on the upper side of the Wolfcamp lateral. It also depicts the extent of communication between the traced Wolfcamp lateral (Well 1) and the untraced, shallower Bone Springs lateral (Well 2) in the same format as described for the Wolfcamp lateral. It is interesting to note that the greater extent of both the traced proppant communication and the traced fracture fluid communication occurred in the outer-third of the Bone Springs lateral near a legacy well, Well 3. This observation is believed to be a reflection of Well 3 acting as a depletion sink. Reducing the learning curve impacts economics The reduction of two stages per well while maintain- ing completion effectiveness reduced the total stages required by 4%. By reducing the learning curve down to only a single well, informed decisions could be made immediately and that 4% applied across the entire program, thus maximizing fiscal year 2018 savings of more than $5,000,000. The results of this study offer encouragement that in some of the Wolfcamp/Bone Springs operating areas in the Delaware Basin it may indeed be possible to increase operational efficiencies and reduce com- pletion costs by consolidating stages, with the possible caveat that limited-entry design criteria be met. Identifying operational efficiencies can be a chal- lenge. By taking a holistic approach in applying core data, diagnostic expertise and operator experience to sound business initiatives, it is a challenge that can be met with great success. n FIGURE 3. The proppant tracer placement/communication below the laterals and fluid tracer recovery/communication above the laterals are shown. (Source: ProTechnics) FIGURE 4. Fiscal Year 2018 Savings 51 stage design $5,180,854 49 stage design cost saving $116,302 2 stages perf and plug $16,000 6 hrs/stage for 2 stages $24,000 Total savings/well $156,302 32 remaining wells for FY 2018 $5,001,682

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