Research Article

Experimental Study on Sealing Failure Mechanism of Injection-Production String in Underground Gas Storage under Cyclic Loading

Table 2

Working parameters of an injection-production tubular string of gas storage.

The parameter nameThe parameter valueThe parameter nameThe parameter value

Tubing outside diameter114.3 mmPacker anchor timing wellhead pressure11 MPa
Tubing wall thickness7.37 mmPacker set timing wellhead pressure20.5 MPa
Tubing steel gradeP110Wellhead pressure when shear ball seat35 MPa
Tubing running depth3580 mWellhead pressure during annulus pressure test10 MPa
Mass per unit length of tubing20.09 kg/mAnnuli liquid density0.9 g/cm3
Tubing mass density7.85 g/cm3Gas dynamic viscosity0.011 m·Pa·s
Poisson's ratio of tubing2.06 × 105 MPaInjected gas specific gravity0.6
Linear expansion coefficient1.25 × 10−51/°CInjected gas temperature15°C
Friction coefficients0.24Injected gas density0.7236 g/cm3
Tubing wall equivalent roughness0.03 mmDaily gas injection volume150 × 104 m3
Packer setting depth3200 mDaily gas production volume120 × 104 m3
Minimum inner diameter of packer97.79 mmUpper limit operating pressure36 MPa
Maximum outside diameter of packer146.05 mmLower limit operating pressure16 MPa
Completion fluid density1.05 g/cm3Rated tensile strength1877 MPa
Ambient temperature15°CRated internal pressure strength85.53 MPa
Formation temperature92.7°CRated collapse strength73.74 MPa
Temperature gradient2.2°C/100 mTensile efficiency of a certain thread100%
Tubing temperature before entering the well15°CCompression efficiency of a certain thread60%