东北冻土区天然气水合物科学钻探试验及钻进效率影响因素分析

Northeast Permafrost Gas Hydrate Scientific Drilling Test And The Analysis of Factors Influencing Drilling Efficiency

摘要:

东北冻土区天然气水合物钻探试验MK-2井中，采用了天然气水合物取心技术，同时还装备了钻井参数监控系统。利用钻井参数监控系统采集到的钻井深度、钻压、钻速、转速、回转扭矩、流量、泥浆循环泵压力等数据，结合地层情况，对影响钻进效率的因素进行了分析。分析表明：①在破碎带、碳质板岩和糜棱岩的地层中钻进效率低，在砂岩、砂质泥板岩、泥板岩和板岩的钻进效率较高；②得到了在不同地层中的最优钻压；③ MK-2井钻探试验使用的技术、设备和试验结果对于以后的天然气水合物钻探具有一定的借鉴意义。

Abstract:

In the Northeast permafrost zone of China, MK-2 hole was drilled for natural gas hydrate drilling test by using gas hydrate coring technology and drilling parameter monitoring system. Drilling parameter monitoring system can collect parameters such as depth, WOB, ROP, rotary speed, rotary torque, flow rate and mud pump pressure. Combining with these parameters and the formation conditions, the factors that affect the drilling efficiency were analyzed. By the analysis, some results are gotten: ①low drilling efficiency is in the broken belt, carbonaceous slate and mylonite formation; while high drilling efficiency in sandstone, sandy shale and slate; ②obtaining the optimal WOB for different strata; ③test technology, equipment and test results in the MK-2 hole can be reference for future natural gas hydrate drilling.