Abstract
ABSTRACT Low-permeability sandstone reservoirs play a great role in the exploration and production of oil and gas resources, but most of them undergo a rapid reduction in permeability at the beginning of the production process and exhibit a depleted production rate as time progresses. To discern the rapid reduction mechanism of permeability, an experimental study was performed using low-permeability sandstone specimens. Using a digital image correlation method, a binary image process was used to capture fluid flow passage through microscopic pore structures. Combined with a laser engraving technique, a simplified displacement experiment was conducted, and it was found that the rapid reduction in permeability was caused by loose grain particles, which can be transferred with the fluid and thus block the pore throats. These preliminary findings can provide guidance for improving the production prediction accuracy and understanding of the rapid depleted production rate at the beginning of the production history.
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