倾斜管中CO_(2)水合物生成及堵管实验研究

Experimental research on CO_(2) hydrate formation and pipe blocking in inclined pipe

研究倾斜管内气液两相流的堵管机理对于保证油气的安全输送起到至关重要的作用。因此,在高压可视水合物实验环路上开展了倾斜管中水+CO_(2)体系下的水合物堵管实验,探究了压力、流速等因素对CO_(2)水合物浆液流动和堵管时间的影响。实验结果表明,在流速分别为3 L/min或5 L/min或7 L/min的条件下,初始压力为2.7 MPa、3.0 MPa和3.3 MPa时,水合物浆液流动时间分别为451 s、336 s、303 s或632 s、510 s、391 s或740 s、657 s、512 s。由此可知,初始压力越大,水合物浆液的流动时间越小,管路越容易发生堵塞。在初始压力分别为2.7 MPa或3.0 MPa或3.3 MPa的条件下,流速为3 L/min、5 L/min和7 L/min时,水合物浆液流动时间分别为451 s、632 s、740 s或336 s、510 s、657 s或303 s、391 s、512 s。由此可知,初始流速越大,水合物浆液的流动时间越大,管路越不易发生堵塞。因此,可以通过减小初始压力和增大初始流速来有效减小管路堵管趋势。

Studying the blocking mechanism of gas-liquid two-phase flow in inclined pipes plays a vital role in ensuring the safe transportation of oil and gas.On the high-pressure visible hydrate experimental loop,a hydrate plugging experiment under the water+CO_(2) system in an inclined pipe was carried out,and the influence of pressure,flow rate and other factors on the flow of CO_(2) hydrate slurry and the plugging time were explored.The experimental results show that under the conditions of flow rate of 3 L/min or 5 L/min or 7 L/min,and the initial pressure of 2.7 MPa,3.0 MPa and 3.3 MPa,the hydrate slurry flow time is 451 s,336 s,303 s or 632 s,510 s,391 s or 740 s,657 s,512 s.It can be seen that the greater the initial pressure,the shorter the flow time of the hydrate slurry,and the easier it is to block the pipeline.Under the conditions of initial pressure of 2.7 MPa or 3.0 MPa or 3.3 MPa,and flow rate of 3 L/min,5 L/min and 7 L/min,the hydrate slurry flow time is 451 s,632 s,740 s or 336 s,510 s,657 s or 303 s,391 s,512 s.It can be seen that the greater the initial flow rate,the longer the flow time of the hydrate slurry,and the less likely it is to block the pipeline.Therefore,the tendency of pipeline blockage can be effectively reduced by reducing the initial pressure and increasing the initial flow rate.