Structural formation and evolution mechanisms of fracture plugging zone

XU Chengyuan,ZHANG Jingyi,KANG Yili,XU Feng,LIN Chong,YAN Xiaopeng,JING Haoran,SHANG Xiangyu

Table 3 Results of fracture plugging evaluation experiments.

Number Formula Pressure bearing capacity/MPa Cumulative loss/mL 1-0# Base mud +5% LCM-D4+3% LCM-K4+5% LCM-K5+3% LCM-G4+7% LCM-K6+ 0.5% LCM-K2 5.5 130.0 1-1# Base mud +5% LCM-K3+3% LCM-K4+5% LCM-K5+3% LCM-G4+7% LCM-K6+ 0.5% LCM-K2 18.4 77.0 1-2# Base mud +5% LCM-K3 1.5 157.0 2-0# Base mud +1% LCM-K3+3% LCM-K4+3% LCM-K5+3% LCM-G12+3% LCM-G7+4% LCM-G10+3% LCM-D21+ 0.8% LCM-G8 <1.9 252.5 2-1# Base mud +3% LCM-K3+3% LCM-K4+3% LCM-K5+3% LCM-G12+3% LCM-G7+4% LCM-G10+3% LCM-D21+ 0.8% LCM-G8 <5.0 196.0 2-2# Base mud +5.5% LCM-K3+3% LCM-K4+3% LCM-K5+3% LCM-G12+3% LCM-G7+4% LCM-G10+3% LCM-D21+ 0.8% LCM-G8 19.0 73.4 2-3# Base mud +7% LCM-K3+3% LCM-K4+3% LCM-K5+3% LCM-G12+3% LCM-G7+4% LCM-G10+3% LCM-D21+ 0.8% LCM-G8 19.0 37.5