Calculation Analysis of Pressure Wave Velocity in Gas and Drilling Mud Two-Phase Fluid in Annulus during Drilling Operations

Table 1

Parameters of calculation well.

Type	Property	Value
Mud	Dynamic viscosity (Pa · s)	0.056
	Density (kg/cm^3)	1460
Gas	Relative density	0.65
	Viscosity (Pa · s)	1.14 × 10^−5
String	Elastic modulus of string (Pa)	2.07 × 10^11
	Poisson ratio of string	0.3
	Roughness (m)	1.54 × 10^−7
Surface condition	Surface temperature (K)	298
	Atmosphere pressure (MPa)	0.101