A study of hydrate plug formation in a subsea natural gas pipeline using a novel high-pressure flow loop

作者：Li Wenqing; Gong Jing^*; Lu Xiaofang; Zhao Jiankui; Feng Yaorong; Yu Da

来源：Petroleum Science, 2013, 10(1): 97-105.

DOI：10.1007/s12182-013-0255-8

• Natural gas hydrate
• blockage
• flow assurance
• high-pressure loop
• water cut
• flow rate

The natural gas pipeline from Platform QK18-1 in the southwest of Bohai Bay to the onshore processing facility is a subsea wet gas pipeline exposed to high pressure and low temperature for a long distance. Blockages in the pipeline occur occasionally. To maintain the natural gas flow in the pipeline, we proposed a method for analyzing blockages and ascribed them to the hydrate formation and agglomeration. A new high-pressure flow loop was developed to investigate hydrate plug formation and hydrate particle size, using a mixture of diesel oil, water, and natural gas as experimental fluids. The influences of pressure and initial flow rate were also studied. Experimental results indicated that when the flow rate was below 850 kg/h, gas hydrates would form and then plug the pipeline, even at a low water content (10%) of a water/oil emulsion. Furthermore, some practical suggestions were made for daily management of the subsea pipeline.

• 出版日期2013-3
• 单位中国石油大学（北京）; 中国石油天然气集团公司管材研究所; 中国石油天然气股份有限公司勘探开发研究院