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Challenges:

  • Deep linear overall target depth of over 220 meters (722 feet)
  • The drilling angle significantly increased the frictional resistance along the outer drill string requiring numerous override casings, from 12 inches diameter telescoping down to 5 inches (total length of all override casings deployed = 567 meters)
  • HQ coring in bedrock required high-speed coring head


Achievements:

  • Less than 1 degree of measured deviation along the borehole
  • Accurately identified the transition sequence and switched to the high-speed head for HQ coring in the bedrock
  • Completed the borehole with a nested VWP installation (three instruments)

Challenges:

  • Coarse overburden soil conditions (gravels) needed to be fully cased prior to advancing the borehole down to the PMT test zones
  • Presence of thin interbedded layers required continuous monitoring during test pocket drilling to avoid placing the PMT bladder across contrasting soils types (resulting in non-uniform bladder expansion)


Achievements:

  • Adjusted and refined drilling methodologies to create quality test pockets in variable soil conditions
  • Performed PMTs up to 45 meters in dept

Challenges:

  • Switching between drilling and testing methodologies while maintaining production and quality data collection
  • Hard pushing was required to advance the CPTu through challenging soils


Achievements:

  • Deployed both CPTu and eVST systems from both sonic rigs
  • Used mud rotary techniques from the sonic rig to limit disturbance prior to deploying eVST
  • Successful adaptation and utilization of custom 20-ton CPTu Ramset to any drilling unit, especially during hard pushing applications

Challenges:

  • Targeted CPTu and eVST within sensitive soils
  • Counter-acting the artesian flow to allow for accurate installation of filter material around screened section
  • Accurately determining pressure balance requirements for installation of hole sealing materials under artesian conditions


Achievements:

  • Efficiently switched between mud rotary and sonic methods to limit disturbance and collect high-quality in-situ test data
  • Adapted PVC monitoring well to relief pump to counter-balance artesian pressures

Challenges:

  • Target depths up to 150 meters below mudline, in up to 18 meters of tidal water conditions
  • Isolating the eVST system from the effects of tidal conditions and any barge movements
  • Optimizing CPTu production for deep soundings
  • Performing over water seismic shear wave velocity testing


Achievements

  • Deployed custom CPT Ramset with through-chuck mechanism and 20-ton thrust capacity for increased CPTu production on deep soundings
  • Designed eVST isolation mounting system for performing deep tests under tidal water conditions
  • Switched mid-borehole between sonic and mud rotary methods to achieve minimal disturbance prior to Piston Shelby tube sampling in challenging soils

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