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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
Issue:
First Page:
Last Page:
Title: Mechanisms
of Formation Damage in Diagenetically Altered Sandstones: ABSTRACT
Author(s):
Article Type:
Abstract:
Diagenetically altered sandstones ("shaly sands") are extremely susceptible to formation damage during drilling, completion, stimulation, or enhanced-recovery operations. This susceptibility arises because of the development of diagenetic minerals within the pore system and because of physical and chemical interactions between the diagenetic minerals and the injected fluids.
Formation-damage mechanisms
can be separated into three groups: mechanical, chemical, and physical. The mechanical
mechanisms
include migrating clays, swelling clays, and sloughing clays. The chemical
mechanisms
include dissolution of minerals and precipitation of minerals. Physical
mechanisms
of formation include emulsion blockages or water blockages.
The scanning electron microscope allows the geologist or engineer to observe directly the mechanisms
for formation damage in a
reservoir
and to design his treatment accordingly. The SEM can also be used to observe the effects of well treatments and evaluate their success or failure.
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