Water block Definition

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Water block:

1.

A reduction in the permeability of a formation caused by the invasion of water into the pores.

2.

A relative permeability problem usually occurring in a gas zone.

Highest potential formations for water blocks are low pressure gas sands (<0.25 psi/ft pore pressure), with small pore throats (<10 microns), lower permeability (<100 md), and when using water that has a surface tension about 50 dyne/cm.

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