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Hydraulic Fracturing Techbook 2018

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EPmag.com | August 2018 | 89 HYDRAULIC FRACTURING: CASE STUDIES lateral coverage with fewer stages, it would be neces- sary to increase the number of perforation clusters in each remaining stage. With a higher perforation count per stage, it was deemed necessary to increase the total fracture rate to obtain sufficient rate per perforation to maintain the established limited-entry design criteria. The design changes that were employed included an increase in perforation clusters per stage from six clusters to seven to eight clusters while maintaining a minimum fracture rate of 4 bbl/min per perforation or approximately 90 bbl/min total rate. The overall completion criteria were otherwise comparable to those used previously in the area (i.e., cemented plug and perf; slickwater fluids; 100 mesh sand, 40/70 mesh sand, and 40/70 mesh curable resin-coated sand; a maximum proppant concentration of 2 ppg; total proppant placement of approximately 2,500 lb per lateral ft; and rate diversion only). To quickly determine the efficacy of the design changes in the comparable reservoir rock, testing was implemented on the first Wolfcamp lateral in the completion program. The stage lengths and number of perforation clusters per stage were varied across stages 11 through 47 (stages 1-10 were completed Stage Clusters Stage Contain NWB Prop (ft) Traced M Lbs BPM/Perf 11 6/6 Good 175 415.8 4.0 13 6/6 Poor 177 419.3 4.9 15 6/6 Poor 177 420.1 4.5 17 6/6 Poor 173 419.6 4.9 19 6/6 Poor 179 419.0 4.6 21 6/6 Poor 179 419.0 4.7 23 6/6 Poor 178 419.6 4.9 25 6/6 Poor 178 420.7 4.7 27 7/7 Good 223 525.1 4.3 29 7/7 Fair 217 525.7 4.1 31 7/7 Fair 220 525.3 4.2 33 7/7 Good 219 524.8 4.3 35 7/7 Good 205 525.3 4.3 37 7/7 Good 221 518.6 4.2 39 7/7 Fair 222 524.9 4.3 41 7/7 Good 222 525.1 4.3 43 7/7 Good 224 525.3 4.3 45 7/7 Good 219 524.9 4.3 47 7/7 Poor 221 525.9 4.3 Total 125/125 3,826 9,124 Avg 100% 201.4 480.2 4.43 FIGURE 1. The results from the Wolfcamp lateral completion parameters/completion are presented. (Source: ProTechnics)

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