关键词: 定向钻进技术, 定向钻机, 复杂地层, 钻井液

Abstract: Directional drilling technique and equipment, as a kind of most advanced technique in the field of underground drilling in coal mine in recent years, has played a more and more important role in gas control of coal mine. But after researching, we know that the structural characteristics of this technique and equipment determine more effective in stable formation, and less effective in complex formation. Therefore, using directional drilling technique construction in complex formation (soft seam, structural belt), how about the drilling risk and what about the application prospect of this technology, has still no systemic research conclusion.So the author tracks the application test using ZYWL-6000D Directional drill in Gaohe coal mine. The test completed five boreholes. Most of their main holes’ depths are above 480m, and the No.4 main hole’s depth is 561m. According to the test results, for Gaohe coal mine with soft coal (f<0.45) and complex geological structure formation, although drilling is difficult and there are more unexpected situations, we can also adopt directional long drilling if choosing proper construction technology. From this, for complex formation of coal mine, directional drilling technology and equipment has a good application prospect. And It has important significance for gas control in coal seam.