浅析软煤及煤层气钻探取样工具的结构特征

Preliminary Analysis on Structure Feature of Drilling and Sampling in Soft Coal and CBM

摘要:

〗提出了在我国开展软煤及煤层气钻探取样的必要性和对取样工具的特殊要求，在总结提高采取率和取样质量技术途径的基础上，论述并具体分析了用于软煤钻探和钻取含气样品的新型钻具结构，得出了取煤样钻具应具有单动、超前、隔水、避振、防脱功能和取气样钻具应在此基础上增加密封、冻结、集气功能的结论。研讨的钻具结构特征对于开展软煤及煤层气钻探取样的同行具有参考价值。

Abstract:

The necessities of drilling and sampling in soft coal and CBM in China and the special requirements for sampling tools are put forward. Based on the summary on the techniques of improving recovery rate and coring quality, the paper described and analyzed the structure of new drilling tool for soft coal and gas drilling. Coal sampling tools should have the functions of single action, advance, exclusion of water, anti-vibration and thread off prevention; and besides, gas sampling tools shoule have more functions of sealing, freezing and gas collecting.