During a successful coring operation some 720 meter of continuous core hasbeen taken with full recovery. The main purpose of the core is to obtainmaterial for rock mechanical testing. To minimize coring-induced damage, asystematic and detailed planning is made for all stages of the coringoperation. New models are developed to avoid core damage due to core bendingduring retrieval through a curved wellbore and to determine the maximumtripping velocity for core retrieval without harmful over-pressurization.Preliminary laboratory test results indicate a high core quality.

Keywords:
dogleg severity, curvature, retrieval, bubble point pressure, core retrieval, drilling operation, diameter, equation, coring-induced damage, permeability
Subjects:
Well Planning, Wellbore Design, Drillstring Design, Drilling Operations, Drilling Equipment, Drilling Fluids and Materials, Reservoir Characterization, Fluid Characterization, Improved and Enhanced Recovery, Reservoir Simulation
Copyright 2002, Society of Petroleum Engineers
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