Foundation Drilling Case
Enhancing Rock Drilling Efficiency at
Jieyang Thermal Power Plant
——Improved wear resistance and penetration performance through redesigned high-helix roller bit cone barrel 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
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Severe bit wear due to frequent contact with granite and boulders
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Low penetration rate (0.2–0.3 m/h) even in weathered granite
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High variability in strata, making standard parameters ineffective
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Improper bit replacement – mixed old and new cones on the same head
Poor slurry circulation – leading to heat buildup and inefficient debris removal
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Inconsistent operator skills – variable drilling pressure and RPM
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
Related Tools
Tools used or recommended for
similar projects
Roller Bit
Heavy-duty roller bit for core barrels drilling tools working in hard formations.
Roller Bit Core Barrel
Custom core barrel design for bored pile drilling for stable hard rock penetration.
Project Support
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