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合理选择钻孔直径和结构，采用正确的钻进方法，是我们四川地质局在钻探技术方面实行改革的主要内容之一。鉴于新系列φ76毫米双管钻进，其岩、矿芯直径相当或大于原φ75毫米单管或91毫米双管钻进。因此，近年来我们进行了以新系列φ76毫米为基本孔径的普遍改革。从而在原有旧系列的设备、管材、工具的条件下，既易于满足钻进工艺的要求，又扩大了硬质合金钻进的范围，针状合金钻进的比例增大，代替了大部份的钢粒钻进，有效地提高了部份矿区的岩、矿芯采取率和减少了钻孔弯曲，为进一步缩小钻孔直径，简化钻孔结构，逐步采用金刚石钻进打下了基础。
Reasonable choice of drilling diameter and structure, using the correct drilling method, is our Sichuan Bureau of Geology drilling technology in the implementation of reform is one of the main elements. In view of the new series of φ76 mm double pipe drilling, the rock and core diameters are comparable to or larger than the original φ75 mm single pipe or 91 mm double pipe. Therefore, in recent years we have carried out a general reform with the new series of φ76 mm as the basic aperture. Therefore, under the conditions of the original old series of equipment, pipes and tools, it is easy to meet the requirements of drilling technology and expand the range of carbide drilling. The proportion of needle-shaped alloy drilling increases instead of the majority Of the steel grain drilling, effectively improve the rock and core mining rate in some mines and reduce the drilling bending, in order to further reduce the drilling diameter, simplify the drilling structure, and gradually using diamond drilling laid the foundation.