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前言我国南方和西南煤田特点是，不稳定、层次多而薄，顶板软硬不均、夹矸多、媒质酥软等。这些恃点给钻探施工带来了很多困难，钻进过程中保证煤心质量就成为突出的问题。历年来，煤田钻探工作者在党的正确领导下，在三面红旗照耀下，自力更生，奋发图强，突出政治，质量第一，在提高煤心质量方面取得了很大成绩，积累了不少宝贵经验。六三年于湖南湘潭交流总结了有关打煤经验，编写了‘南方不稳定煤层钻进工艺和保证质量措施’一文，对我国煤田勘探保证
Preface China’s south and southwest coalfield is characterized by instability, multi-level and thin, roof hard and soft uneven, more gangbang, soft and crisp media. These measures have brought a lot of difficulties to the drilling construction, and the quality of the coal core has become a prominent issue during drilling. Over the years, coalfield drilling workers, under the correct leadership of the party and under the triumphal red flag, have made great efforts to achieve self-reliance, work hard, highlight politics, and give top priority to quality. They have made great achievements in improving the quality of coal heart and have accumulated a great deal of valuable experience. Six or three years in Hunan Xiangtan exchange summed up the experience of coal mining, prepared a ’southern unstable coal seam drilling technology and quality assurance measures’ article on China’s coal exploration guarantee