Changes

==Core alteration during wellsite handling==

==Core alteration during wellsite handling==

Although changes in the core and its fluid content during coring are unavoidable, it is important to minimize any further damage to the core during wellsite handling which would make the core even less representative of the reservoir. The time a core is exposed to the atmosphere and the drilling

Although changes in the core and its fluid content during coring are unavoidable, it is important to minimize any further damage to the core during wellsite handling which would make the core even less representative of the reservoir. The time a core is exposed to the atmosphere and the drilling fluid during wellsite handling will affect subsequent core analysis measurements.

Depending on atmospheric conditions, exposure of cores for even a short period of time can cause significant loss of water and light hydrocarbon fractions. Tests show exposure for even 30 min can result in 10 to 25% loss in water (American Petroleum Institute, 1960). To prevent saturation changes, the time the core is exposed to the atmosphere should be minimized (see [[Core Handling]] for additional information on core handling techniques).

 

Depending on atmospheric conditions, exposure of cores for even a short period of time can cause significant loss of water and light hydrocarbon fractions. Tests show exposure for even 30 min can result in 10 to 25% loss in water (American Petroleum Institute, 1960). To prevent saturation changes, the time the core is exposed to the atmosphere should be minimized (see chapter on "Core Handling" in Part 3 for additional information on core handling techniques).

==Core preservation during shipment and storage==

==Core preservation during shipment and storage==