Study on Dynamic Response of Downhole Tools under Perforation Impact Load

Table 3

Basic perforation parameters.

Parameter	Value
Liquid dynamic viscosity (μ)	0.01 Pa⋅s
Yield strength of tubing material (σ)	758 Mpa
Outer diameter of oil tube	88.9 mm
Inner diameter of oil tube	76 mm
Length of oil tube string	200 m
Element number of oil tube string	100
Elastic modulus of tubing material ()	206 GPa
Density of tubing material (ρ)	7846 kg/m^3
Total simulation time	80 s
Time step	0.001 s
Outer diameter of perforating gun	73 mm
Inner diameter of perforating gun	62 mm
Length of perforating gun	3.3 m
Charge quantity of a perforating bullet	16 g, 20 g, 32 g, 48 g, 64 g, 128 g
Spring stiffness coefficient of shock absorber ()	12~800 N/mm
Damping coefficient of shock absorber ()	15 N⋅s/mm
Element number of perforating gun	10
Distance between the upper end of the perforating gun and the explosion center	0.2 m