【摘要】 在研究应用于煤层气掏穴井的局部扩径扩孔钻头的基础上,成功研制PS—150/700D型局部扩径双翼扩孔钻头。介绍了新型扩孔钻头的结构、射流作用力计算、设计要点和主要技术参数。试验结果表明,该钻头结构合理,使用安全可靠,能满足煤层气掏穴井的施工需要。更多还原

【Abstract】 Based on the research on local diameter expansion reaming bit for CBM well with local diameter expansion,PS- 150 /700D local diameter expansion double wings reaming bit is successfully developed. The paper introduces this new reaming bit about its structure,jet force calculation,design points and main technical parameters. The test results show that the drill bit is reasonable in structure,safe and reliable in use,can satisfy the construction need of CBM well with local diameter expansion.更多还原