Rok-max Offshore Marine Geotechnical Sampling Bha's & Onshore Geothermal Coring BHA'S

Below is representative of current available designs but we can design and supply any BHA's to accomodate your specific requirements.

Rok-Max Mk5 Wireline Offshore Geotechnical BHA

  • 7" O.D. Multi Function 1.5m & 3m Push Sampling, CPT, SPT, Rotary Non-coring full face hole, 1.5m & 3m PQ-3
  • (83.1mm) Rotary Coring & 3" Wireline hammer sampling.
  • Bit Sizes 8.1/4" O.D. - 9" O.D.
  • Minimum Drillpipe Tooljoint I.D. required 4" (101.6mm)

Standard Wireline Marine Geotechnical BHA

  • Multi function with non-rotating inner tube, 3" Rotary Coring, Extended Coring, Push Sampling, CPT Sampling & Non-coring full face hole.
  • Outer Tube O.D. 6.1/4" - 7.1/4"
  • Bit O.D. 7.1/2" - 8.1/2" x 3" I.D.
  • Available core lengths 3 - 4.5 metres
  • Minimum Drillpipe Tooljoint I.D. required 4" (101.6mm)

Rok-Max Advanced Piston Corer & Multi Function Wireline Marine BHA (as used on IODP 2004 North Pole Project)

  • Advanced Piston Coring, Push Sampling, Extended Coring, Rotary Coring, Non-coring Full Face Hole & Punch Coring.
  • Bit O.D. 8.1/2" - 9.1/2"
  • Piston Sample Core 62mm
  • Rotary Rock Core 68.5mm
  • Outer Tube O.D. 7"
  • Sample Lengths 3m, 4.5m or 5m
  • Overall BHA Length including bit and head sub for 5 metre sample 6990mm
  • Minimum Drillpipe Tooljoint I.D. required 4" (101.6mm)

Geothermal Conventional (Non-wireline) Spot Coring BHA (as used for IDDP 5,000 metre spot coring project 2008 onwards)

  • Bit O.D. 8.1/4" - 8.1/2" x 4" I.D.
  • Outer Tube O.D. 7.1/4" with stabaliser sections to suit bit O.D.
  • Core Length 5m - 10m
  • Overall Length including Bit & Head sub for 10 metre core 11.60 metres
  • Flush 40L/sec

Geothermal Conventional (Non-wireline) Spot Coring BHA

  • Bit O.D. 6.1/8" - 6.1/2" x 3" I.D.
  • Outer Tube O.D. 5.3/4" with stabaliser sections to suit bit O.D.
  • Core Lengths 3m - 10m
  • Flush 30L/sec

Geothermal Wireline BHA

  • Bit O.D. 8.1/4" - 8.3/4" x 3" I.D.
  • Outer Tube O.D. 7.1/4" with stabaliser sections to suit bit O.D.
  • Core Lengths 3m - 5m
  • Minimum Drillpipe Tooljoint I.D. required 4" (101.6mm)
  • Flush 40L/sec