超深地质钻孔的质量控制探讨——以磁西一号勘探区37—3孔为例

河北平原区找煤和老矿区外围勘探深度多在1500m左右，钻孔的质量控制成为保证勘查报告质量的关键。以磁西一号勘探区37—3孔为例，介绍了超深钻孔的的质量控制措施，指出了在孔斜预防方面，要求钻塔安装稳固．选择适宜的钻进参数，采用钻铤加压，保持钻具不弯曲，每200m进行测斜一次；在岩心采取方面，使用双管取心和岩心提断器进行取心，钻时控制在2．5～3h，进尺不超过3m，严格按比例配制泥浆；在采取煤心时，运用三层管单动取煤器取粉煤及块煤，伸缩式二型取煤器取易碎煤心的方法。通过对超深地质孔质量控制关键环节的分析，提出了对超深地质孔质量控制的方法和建议。

Discussion on Quality Control of Ultra-deep Geological Borehole A Case Study of No.37-3 Borehole in Cixi No.1 Exploration Area

Most exploration depths in Hebei Plain and old coalmine periphery are about 1500m; the borehole quality control is the key to ensure quality of exploration report. To take the No.37-3 borehole in the Cixi No.l exploration area as an example, introduced quality control measures of ultra-deep borehole： ① on prevention of deviation, requiring derrick foursquare installation, selecting suitable drilling parameters, using drill collar pressuring, non-bending drilling tools, surveying inclination every 200 meters; ② on coring, using double-pipe corer and core catcher, drilling time 2.5-3h and footage 3m controlled, strictly preparing drilling mud pro rata;③ using 3 layered pipe single-acting coal corer to core fine coal, stretch out and draw back type Ⅱ coal corer to core friable coal. Through analysis of quality control critical link of uhra-deep geological borehole, methods and suggestions put forward.