Method for stimulating injection wells using reducing agents
AssigneeJgs Resources, LLC
InventorsSriram Solairaj, Gary Arnold Pope
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Abstract
Described herein are methods and systems for increasing the injectivity of wells used to inject water or water containing various chemicals such as water-soluble polymers for the purpose of increasing the recovery of hydrocarbons such as crude oil from a hydrocarbon-bearing formation. Injectivity often decreases because of adverse reactions or plugging at or near the wellbore. The treatment procedure involves injecting reducing agents (e.g., sulfite or metabisulfite salts) dissolved in water or water containing other chemicals such as polymers.
Claims20
A method for increasing the injectivity of an aqueous injection fluid to improve oil recovery from a hydrocarbon-bearing formation, the method comprising:
- introducing a sulfite or metabisulfite salt into an aqueous injection fluid;
- and
- injecting the aqueous injection fluid through a wellbore and into the hydrocarbon-bearing formation;
- wherein the sulfite or metabisulfite is dissolved in the aqueous injection fluid in an effective amount to increase an injection rate of the aqueous injection fluid into the hydrocarbon-bearing formation, prevent degradation of a polymer present in the aqueous injection fluid, or a combination thereof,
- wherein the effective amount is at a concentration of from greater than 1,000 ppm to 500,000 ppm.
Dependencies are inferred from the claim text.