Xanthan stability at elevated temperatures. [xanthan]
- New Mexico Petroleum Recovery Research Center in Socorro (US)
- Exxon Prodution Research Co. (US)
Xanthan stability is examined to define more clearly the polymer's temperature limitations as a mobility-control agent. Experiments were performed to probe the relative importance of hydrolysis, oxidation, and helix-coil transitions in xanthan degradation. In the absence of oxidizing agents (i.e., dissolved oxygen), results indicate that free-radical, oxidation/reduction reactions are not the dominant mechanism for xanthan degradation. Depending on the pH, acid-catalyzed hydrolysis and base-catalyzed fragmentation reactions may play important roles. With Arrhenius calculations, it was estimated that under ideal conditions (no dissolved oxygen, pH 7 to 8, and moderate to high salinities), a xanthan solution could maintain at least half of its original viscosity for a period of 5 years if the temperature does not exceed 75 to 80{degrees}C (167 to 176{degrees}F). New polymers will be needed for chemical floods where xanthan does not have sufficient stability.
- OSTI ID:
- 6916075
- Journal Information:
- SPE (Society of Petroleum Engineers) Reservoir Engineering; (USA), Vol. 5:1; ISSN 0885-9248
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DISPLACEMENT FLUIDS
STABILITY
OIL WELLS
MICROEMULSION FLOODING
POLYMERS
ACIDIZATION
CALCULATION METHODS
CHEMICAL COMPOSITION
EXPERIMENTAL DATA
HIGH TEMPERATURE
OXIDATION
CHEMICAL REACTIONS
DATA
FLUID INJECTION
FLUIDS
INFORMATION
MISCIBLE-PHASE DISPLACEMENT
NUMERICAL DATA
WELLS
020300* - Petroleum- Drilling & Production