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煤田钻探超千米孔钻进，出现打丢、打薄煤层时，为了保证勘探质量，不至影响采样化验和对井田的评价，终孔后也要补打斜孔。超千米孔打斜孔，是一件技术复杂、施工又很困难的工作。因此选择的工具、操作方法要得当，应一次打成功。以井田D30号孔为例：该孔终孔深度1303.15米，由1096.98～1283.43米共见可采煤层四层，总煤厚5.76米，采长2.39米，采取率仅达42％。特别是第三层煤于1261.47～1263.60米见2.8米厚的煤层，采长0.7米，采取率只达25％，且煤心污染，结构不清。经研究决定，在1243米处打斜孔补救。
Drilling over a thousand meters hole drilling, appeared to lose, thin coal seam, in order to ensure the quality of exploration, not to affect the sampling test and the evaluation of the minefield, after the hole must also fill oblique hole. Overshoot holes diagonal drilling, is a complex technology, construction and very difficult work. Therefore, the choice of tools, methods of operation should be properly, should hit a successful. Take D30 hole in Ida as an example: The hole depth of the hole is 1303.15 meters, from 1096.98 to 1283.43 meters, four layers of commonable coal seam, total coal thickness of 5.76 meters, mining length of 2.39 meters, the adoption rate of only 42%. In particular, the third layer of coal at 1261.47 ~ 1263.60 meters see 2.8 meters thick seam, mining 0.7 meters long, taking only 25%, and the coal heart pollution, the structure is unclear. After the study decided to play slash at 1243 meters remedy.