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Condensate Blockage Phenomenon<br />
When the well pressure drops below the dew point it results<br />
in accumulation of <strong>condensate</strong>. First it happens near the<br />
wellbore where pressure is lowest and then it spreads.<br />
No significant <strong>condensate</strong> blockage was<br />
observed in <strong>Kristin</strong> wells.<br />
Capillary forces trap the dropped-out fluid<br />
in pores making it mostly immobile. The<br />
result is restricted <strong>gas</strong> flow that can cause<br />
large decrease in well productivity.<br />
Low permeability reservoir (< 10-50 mD)<br />
are more vulnerable for productivity<br />
damage due to higher capillary forces.<br />
<strong>Kristin</strong><br />
P dew = 400 bar<br />
P init = 900 bar<br />
Reported some cased of 50 to 80%<br />
production falls due to <strong>condensate</strong><br />
blockage.<br />
Bottom-hole<br />
condition<br />
Images from “Oil<strong>field</strong> Review” 2005<br />
26 - Classification: Internal 2010-11-10
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