Enhancing Rock Drilling Efficiency at Jieyang Thermal Power Plant
——Improved wear resistance and penetration performance through redesigned high-helix roller cone barrel bits in complex granite formations.
Project Overview
Location: Qianzhan Town, Huilai County, Jieyang, Guangdong
Contractor: Zhongji Jiankan Group Co., Ltd.
Project: Foundation piling for a 2×1000MW thermal power plant
Timeline: 8 months (Started Feb 2025)
Drill Rigs: SANY SR285R/235/360, Sunward SWDM420/42H-II, XCMG XR360
Main Geological Condition: Dense granite with UCS up to 129 MPa
Main Challenges Faced During Drilling
Severe bit wear due to frequent contact with granite and boulders- Low penetration rate (0.2–0.3 m/h) even in weathered granite
- High variability in strata, making standard parameters ineffective
- Improper bit replacement – mixed old and new cones on the same head
- Poor slurry circulation – leading to heat buildup and inefficient debris removal
- Inconsistent operator skills – variable drilling pressure and RPM
Severe bit wear due to frequent contact with granite and boulders
Low penetration rate (0.2–0.3 m/h) even in weathered granite
High variability in strata, making standard parameters ineffective
Improper bit replacement – mixed old and new cones on the same head
Poor slurry circulation – leading to heat buildup and inefficient debris removal
Our Engineering Solutions
- Rapid wear in hard rock – high spiral core barrel design, optimized cutter layout
- Poor slag removal – improved flow path + enhanced mud management
- Inconsistent operator operation – on-site training + distribution of operation manuals
- Poor tracking and maintenance – one machine one drill bit policy with usage log
- Inefficient coring – suggested updating of triangular core holding system
Customer Feedback
Need Help with Hard Rock Projects?
Whether you’re drilling through granite, inclined rock, or boulder zones, DRILLNOVA offers reliable tools and expert advice. Contact us for custom solutions.