南极冰层钻进铠装钻具升降运动特性分析与试验

Analysis and Experimental Study on Motion Characteristics of Armored Cable Drilling Tool Lifting in Antarctic Ice Drilling

极地冰层取心钻具的升降运动特性对提高钻进效率、减少孔内事故具有重要影响。在总结极地冰钻特点的基础上,分析了钻孔直径、钻具质量和钻井液的流变特性对钻具在升降过程中的影响,钻具在钻孔过程中运动的两阶段特性、滞流层的存在与影响因素,确定了因钻具的运动所引起的流体扰动量与扰动范围。研制了用于测试铠装电缆悬挂式钻具升降测试试验台和测试的方法,通过对3个不同直径与3个不同质量的钻具在其下落过程的实际测试,得出了钻具下落速度与直径呈二次方关系,与钻具的质量成线性关系的结论。

The motion characteristics and control in hole make a big difference in improving the efficiency of drilling and re-ducing the hole accident in the process of lifting tool during polar ice core drilling.Depending on the summarization of the characteristics of polar ice drilling, analysis is made on the impact to the borehole structure, drilling tool structure, the quality of the drilling tool and rheological behavior of drilling fluid.The characteristics of two stages of tool motion in drill-ing process, the existence of stagnant layer and the influence factors determine the quantity and range of the fluid disturb-ance.A lifting test-bed and test method are developed for armored cable hanging tool testing, by the real testing of the fall-ing process of drilling tools with three different diameters and three different weights, the conclusion is drawn that the drill-ing down speed presents quadratic relationship with the diameter of drilling tool and linear relationship with the quality of drilling tool.The result has a vital theoretical and practical significance in improving the drilling efficiency in Antarctic, saving the service auxiliary working time and guiding the acture work.