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

Abstract:

The motion characteristics and control in hole make a big difference in improving the efficiency of drilling and reducing 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 drilling process, the existence of stagnant layer and the influence factors determine the quantity and range of the fluid disturbance. A lifting test-bed and test method are developed for armored cable hanging tool testing, by the real testing of the falling process of drilling tools with three different diameters and three different weights, the conclusion is drawn that the drilling 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.

Key words:Antarctic ice drilling; armored cable drilling tools; drilling fluid; lifting and lowering movement