WS39 casing tooth
JM cutter tooth
B47K22 bullet toothFIELD REPORTS
Core-barrel trials,
rebuilds and site inspections.
Start with the problem the site needed to solve. Explore the tool changes, on-site support and recorded findings behind each decision.
7 records
Rebuild & follow-up
On-site MH-3 refit: 50+ m of recorded drilling
Zengcheng · 2022
We helped refit the customer’s existing barrel, guided positioning and welding, and trained the operators. Later follow-up recorded approximately 57 m of cumulative drilling.
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Site trial
800 mm high-spiral trial: improving cuttings discharge
Jieyang · June 2025 · 800 mm high-spiral roller-bit core barrel
Heavy wear and packed cuttings prompted a new barrel design. Follow the operator’s encouraging discharge feedback, the recovered rock and dated wear checks.
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Pre-rebuild survey
1,500 mm rebuild: measure before fitting new bits
Hunan · Site survey
A twelve-position survey checks the existing cutting ring, cutter seats and projection. Use the findings to define the rebuild before installing replacement roller bits.
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Position-by-position inspection
Which roller bits need replacing?
Site inspection · April 2023
A 1,200 mm barrel needs selected roller bits replaced. Compare the mounting positions, individual condition and worn guides before setting the repair scope.
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Operation & inspection
B47K22: when the drilling method needs a review
Guangdong · 5–6 December 2023 · B47K22 / 1,000 mm core barrel
Two lifted-tool inspections connect tooth rotation, packed cuttings and the operator’s response. See why the crew changed to direct bucket work.
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Complete-tool review
800 mm barrel: investigating packed cuttings
Southern China · 2022
Check what happens around six MH-3 roller bits and two scrapers. Drilling observations and the lifted tool put cutting, clearing and core recovery in the same review.
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Field analysis
Steel loss: examine what supports each insert
Shiyan · February 2022
Compare early and later field photographs to examine steel loss around the carbide inserts, alongside the rock-entry and cuttings conditions.
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