连续管配合高压水射流的海底管道解堵研究

Feasibility Study on Unblocking Submarine Pipeline with the Coiled Tubing and the High-pressure Water Jet

目前我国针对海底油气管道的堵塞问题尚没有经济有效的处理方法。通过对海底管道的作业环境进行分析,并参考前人的作业案例,以连续管为下入工具,以高压水射流技术为解堵方案,对方案的可行性进行了研究。在建立下入工具最大下入深度计算模型的基础上,分析了高压水射流冲击堵蜡的作用效果。分析结果表明:将连续管作为下入工具,存在最大下入深度的约束;一定范围内射流压力越大,冲击深度越大,但是受喷嘴对射流结构的影响,喷嘴一定,其射流核心段和基础段的长度固定,冲击深度一定;水射流对于蜡的破坏作用明显,能很快解除蜡堵,射流压力越大,其解堵效果越好。研究内容为解决海底管道的堵塞提供了新方法。

At present,there is no cost-effective method to deal with the blocking of submarine oil and gas pipelines. Based on the analysis of the operating environment of the submarine pipeline,and referring to the previous operating cases,taking coiled tubing as running tool and the high pressure water jet technology as the pipeline unblocking solution,the feasibility has been studied. Based on the calculation model of the maximum running depth of running tool,the high pressure water jet wax unblocking performance has been analyzed. The results show that there exists limitation of maximum running depth taking coiled tubing as the running tool. In a certain range,the higher the jet pressure is,the larger the impact depth is. But considering the influence of nozzle on the jet structure,given the certain nozzle with determined jet core section and foundation section,the impact depth could be determined. The water jet damage on wax is significant,and the wax can be quickly unblocked. Higher jet pressure could lead to better unblocking performance. The conclusion could provide a new way to addressing the blocking of submarine pipeline.