Method of inhibiting crosslinking of aqueous xanthan gums in the presence of ferric acid ions
The cross linking of aqueous xanthan gums in the presence of ferric ions is inhibited or prevented by adding a soluble alkanoic and/or alkenoic acid having at least 4 carbon atoms and bearing at least 2 hydroxyl groups per molecule, and/or a soluble salt of ..gamma..-lactone. This combination of ingredients forms gelled acid compositions which are useful in acidizing treatments of wells. The gelled acid compositions are viscous fluids which have increased stability against shear and thermal degradation and other properties which result in retarded reaction rates and reduced fluid leak-off during acidizing treatments of subterranean formations surrounding well bores. The aqueous gelled acids have the further advantage of inhibiting or preventing the formation of insoluble compounds, such as ferric hydroxide, during such acidizing treatments. 13 claims.
- Assignee:
- Dow Chemical Co.
- Patent Number(s):
- US 4317735
- OSTI ID:
- 6484836
- Resource Relation:
- Patent File Date: Filed date 18 Mar 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FRACTURING FLUIDS
CHEMICAL COMPOSITION
OIL WELLS
ACIDIZATION
XANTHUM GUM
CROSS-LINKING
CONTROL
HYDROXYL RADICALS
IRON COMPOUNDS
IRON HYDROXIDES
LACTONES
ORGANIC ACIDS
STABILITY
SYNTHESIS
VISCOSITY
CARBOHYDRATES
CHEMICAL REACTIONS
ESTERS
FLUIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYMERIZATION
POLYSACCHARIDES
RADICALS
SACCHARIDES
TRANSITION ELEMENT COMPOUNDS
WELLS
020300* - Petroleum- Drilling & Production
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)