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AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain

Qualitative Core Data Management for Efficient Exploitation and Future Explorations of Hydrocarbon Reservoirs through Corrections in Laboratory Generated Petrophysical Data

Surajeet Rath1

(1) Basin, Oil and Natural Gas Corporation Ltd., Kolkata, India.

The Petrophysical studies carried out in the Laboratories; generate sets of data on Porosity, Permeability, Relative and Effective permeability for effective exploitation of the reservoir. These data are generated by doing experiments on core plugs which were plugged out from different well cores owing to different reservoir sands. As we know that the cores are cut by the rotating and chipping actions of the bit, each peripheral particle lying on the peripheral portion of the core experiences a tremendous frictional force due to the rotational effect of the bit resulting in a tremendous heat generation along the peripheral part. These phenomena may occur for small time duration but this will have a definite impact and can change the original orientation of the particles lying in the periphery. The over all data on porosity, permeability, relative and effective permeability thus generated can have an erroneous factor through its generation. The error occurs again as a second obliteration when core plugging job is carried out. The job which is similar to drilling and coring job in a smaller magnitude. This again resulted in changing the original orientation of the particles lying in the peripheral part of the core plug. Under tremendous amount of frictional force and temperature of high magnitude these peripheral particles lose some of their original petrophysical properties as well as orientations. Where as during the petrophysical studies at the laboratories we never consider these changes made through the making of plugs and the petrophysical data generated there after is bound to be erroneous with varying magnitude. So by using a suitable constant during these processes which can be calculated to the nearest approximation by taking the amount of frictional forces, amount of heat generated and the mineralogical composition and rock type of the core/ plug involved during the processes. These corrections will help for better representation of the petrophysical characters leading to efficient Reservoir exploitation and future exploration activities through better data management.