水力喷射微小井眼技术用于海域水合物钻探的可行性分析

Feasibility of application of hydraulic jet micro-borehole technologyto marine hydrate drilling

天然气水合物具有储量丰富、清洁高效的特点,世界各国非常重视天然气水合物资源的调查和开采工作,我国在2017年顺利实施了海域天然气水合物直井试采工作,并取得了丰硕的成果。水力喷射微小井眼技术是一项正在兴起的新型钻探技术,已经在石油钻探中得到了一定的应用,将其应用到海域天然气水合物钻探中具有钻井成本低、可顺利完成水平段钻进、降低井眼轨迹控制难度、储层污染小,降低了大规模海底坍塌的风险的优势,但是还存在着水平段长度短、井壁稳定性差、卡钻事故处理难度大、钻井工具开发难、连续油管寿命短等关键技术问题需要解决。

In the post-petroleum era,natural gas hydrate has become the best energy source for exploitation.It has the characteristics of abundant reserves,cleanliness and high efficiency.Countries all over the world attach great importance to the investigation and exploitation of natural gas hydrate resources.In 2017,China successfully implemented the vertical well production test of marine natural gas hydrate,and achieved fruitful results.The hydraulic jet micro-wellbore technology is a new drilling technology that has been developed and applied in oil drilling;and its application to marine natural gas hydrate drilling has the advantages of low drilling cost,smooth drilling of the horizontal section,less difficulty in control of the well trajectory,small reservoir pollution,and reduced risk of large-scale seabed collapse.But there are still some key technical issues remained for solution,such as the length of the horizontal section,the stability of the borehole,the handling of stuck drills,the development of drilling tools,the short life of coiled tubing.