Disturbance Caused by Drilling Operation

The drilling vessel and consequently the drill pipe will tend to experience a cyclic loading because of the nature of open water operations. To reduce this cyclic load effect, heave compensators are utilized as discussed earlier. Unfortunately, heave compensators do not 

Example Sources of Strength Degradation during In Situ Testing Using the Cone and Vane Soil Sensing 

dimensions, surface roughness Area ratio (vane) 

Alignment and/or stability Rate of penetration or rotation Water pressure influence (cone) 

Calibration, linearity, and hysteresis Calibration drift time, temperature, pressure, etc. 

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