STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

Drilling Muds and Completion Fluids 713
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- HEC. HYDROXYETHYLCELLULOSE -
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Figure 4-124. Effect of HCI on HEC on permeability damage caused by
completion fluid [36]. (Courtesy SPE.)
Table 4-68
Effect of Polymers on Core Permeability [36]
Percent of Percent of
Original Original
Perme- Permeability
ability
Polymer Solution to Brine' to Brine*
Core Type (in 50-percent brine) (forward) (reverse)
2,400-md Cypress sand 0.3% Polyoxyethylene 100 100
740-md Cypress sand 0.3% Polyoxyethylene 100 100
230-md Berea sand 0.3% Polyoxyethylene 100 100
4-md Bedford lime 0.3% Polyoxyethylene 100 100
740-md Cypress sand 0.4% HEC 15 43
740-md Cypress sand 0.4% HEC acid 76 92
740-md Cypress sand 0.4% guar gum 1 25
230-md Berea sand 0.2% guar gum 17 30
4-md Bedford lime 0.1% guar gum 6 15
740-md Cypress sand 0.4% guar gum 10 54
+ enzyme breaker
'Permeability to 5-percent brine measured after resaturating core with brine for a period ranging from 2 to
24 hours following the polymer flood.
Courtesy SPE.