Integrated hydraulic fracturing techniques to enhance oil recovery from tight rocks

ZHOU Fujian,SU Hang,LIANG Xingyuan,MENG Leifeng,YUAN Lishan,LI Xiuhui,LIANG Tianbo

Table 1 Dosage of fracturing fluids, proppants, and temporary plugging agents during the refracturing.

Stage Stage length/ m Pad volume/ m3 Sand- carrying fluid/m3 Proppant volume/ m3 Proppants/m3 Pumping rate/ (m3?min-1) Temporary plugging particles/kg 0.4-0.8 mm (20-40 mesh) 0.3-0.6 mm (30-50 mesh) 0.2-0.4 mm (40-70 mesh) 0.1-0.2 mm (70-140 mesh) 1-5 mm 5-10 mm 11-13 mm 1 87 630 537.6 49.4 4.6 44.8 13.5-14.2 137.1 91.4 34.3 2 86 366 417.4 38.7 4.3 34.4 13.5-14.0 91.4 60.9 22.9 3 83 240 345.7 33.6 12.7 20.9 13.5-14.1 4 87 445 412.4 45.7 24.1 14.8 6.8 12.4-13.7 152.4 101.6 71.1 5 92 600 412.3 49.5 26.9 14.9 7.7 12.3-13.0 137.1 137.2 80.0 6 96 473 266.0 46.4 23.3 18.4 4.7 10.3-11.6