Development of Local Diameter Expansion Double Wings Reaming Bit

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.

Key words:local diameter expansion; reaming bit; CBM well