Hydrates are easily formed at low-lying parts of high-sulfur gas-liquid mixed pipelines due to liquid accumulation. In pigging operations, the pig is often jammed. In order to avoid pig jamming, a novel foam jetting pig was designed in this study. The kinetic model of the jetting pig was established to simulate the hydrate crushing process. In addition, the foam jet flow experimental system was constructed to verify the feasibility of the pig design and the rationality of theoretical analysis results. After the stepped piston in the pig completed a stroke of 400 mm, the maximum jetting pressure reached 10.3 MPa. The diameter of the stepped piston rod and the degree of opening of the outlet valve had significant effects on the jetting pressure and the buffer piston had a significant effect on the buffering velocity. When the diameter of the buffer piston increased from 80 mm to 100 mm, the post-buffering velocity decreased from 0.63 m/s to 0.19 m/s and the buffering effect was improved by 3 times. In the experiment, ice samples were efficiently crushed and the trend of the jet pressure was well consistent with the theoretical calculation results. The study provides the basis for the design of the foam jetting pig and the scheme for improving the removal of hydrates in high-sulfur gas-liquid mixed pipelines.

高硫气液混合管道低洼部位因积液易形成水合物。在清管作业中，清管器经常被卡住。为了避免猪堵塞，本研究设计了一种新型泡沫喷射猪。建立喷射清管器动力学模型，模拟水合物破碎过程。此外，还搭建了泡沫射流实验系统，验证了清管器设计的可行性和理论分析结果的合理性。清管器中的阶梯活塞完成400 mm的行程后，最大喷射压力达到10.3 MPa。阶梯活塞杆的直径和出口阀的开度对喷射压力有显着影响，缓冲活塞对缓冲速度有显着影响。当缓冲活塞直径从80 mm增加到100 mm时，缓冲后速度从0.63 m/s降低到0.19 m/s，缓冲效果提高了3倍。实验中，冰样被有效粉碎，射流压力变化趋势与理论计算结果吻合较好。该研究为泡沫喷射清管器的设计和提高高硫气液混合管道中水合物脱除的方案提供了依据。