对自行设计的ϕ139.7 mm×7.72 mm J55低压气密封螺纹套管接头进行了上卸扣、热循环气密封、弯曲条件下气体内压拉伸、拉伸至失效、加内压至失效等试验。结果表明：该接头的抗粘扣性能良好；135℃，35 MPa条件下的气密封性能和低压30 MPa、弯曲狗腿度10°/（30 m）、拉伸载荷为80%材料名义屈服强度条件下的气密封性能均合格；接头的泄漏失效内压和抗拉强度均远高于标准技术要求。

Making up and breaking out tests, thermal cycle gas-tight tests, internal pressure and tension tests under bending condition, tension to failure tests, and internal pressure to failure tests were carried out to ϕ139.7 mm×7.72 mm J55 low pressure gas-tight casing joint samples. The results show that the anti-gluing property of the joints was good, the sealing capability was qualified both under the condition of the temperature of 135℃ and the pressure of 35 MPa and under the condition of the pressure of 30 MPa, the bending dogleg angle of 10°/(30 m) and the tension load of 80% nominal yield strength. The leakage failure internal pressure and the tension strength of the joints were all much higher than those of the standard technical requirements.