Core

K₀

K_d

K_d /K₀

Temporary blocking test conditions

Drilling fluid system

(*10^-3 μm²)

Differential pressure (MPa)

Time (min)

Filtrate volume (mL)

56

36.81

30.27

82.24

10.0

60

1.25

Basic formula of synthetic based drilling fluid

189

43.52

39.98

91.86

10.0

60

1.0

Basic formula of synthetic based drilling fluid + 2% YRZ

26

136.70

127.29

93.12

10.0

60

0.0

Basic formula of synthetic based drilling fluid + 3% YRZ

247

29.65

28.29

95.43

10.0

60

0.0

Basic formula of synthetic based drilling fluid + 5% YRZ