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世界上95％的岩心钻探管材与工具是按“DCDMA”（美国金刚石岩心钻机制造商协会）标准制造的。绳索取心钻进技术早在40年代，就在石油工业中首先应用。地质钻探用的绳索取心钻具是美国长年公司1947年发明的，开始只有A、B两种尺寸，其后增加了N尺寸。以后，改进为Q系列绳索取心钻具，从AQ至PQ共五级。其尺寸见表1。绳索取心钻进技术随着钻孔的加深，效果越显著。它可大大提高纯钻进时间，延长钻头的使用寿命，减少起下钻的次数，减轻钻具的磨损（特别是延
95% of the world’s core drilling tubing and tools are manufactured according to the “DCDMA” (American Diamond Core Rig Manufacturers Association) standard. Coring drilling technology as early as the forties in the oil industry in the first application. Geological drilling rope coring drill is the United States long-term company invented in 1947, beginning with only A, B two sizes, then increased the N size. Later, the Q Series rope coring tool was improved from AQ to PQ totaling five. Its size is shown in Table 1. Cord Coring Drilling Technology As drilling deeper, the effect is more significant. It can greatly improve the pure drilling time, prolong the service life of the drill, reduce the number of drilling, reduce the wear and tear of drilling tools (especially the extension