At 12:40 on December 19, the middle rotary drilling rig independently developed by our company successfully completed the first pile hole in the No.8 pile of Y20 block of the sixth bid project of the third phase of the Hangyong Multiple Line! The diameter of the first pile is Φ2.2m, the depth of the hole is 83.1m. The rock layer adopts the 1.5m/2.2m graded hole formation process, and the complete fused tuff core with 1.5m diameter, 1.7m length and 70MPa strength is successfully extracted.

The Hangyong multi-line Phase III six-standard project was built by the ninth project company of our company, which received its continuous attention and support during the development and application of the rig, and gave coordination support during the field application process, I would like to express my special thanks!