Acid Sticks


Acid Sticks are water soluble sticks containing a combination of acid, surfactant, dispersing agent, iron sequestrator and inhibitor in solid stick form. Acid sticks are primarily used in natural gas wells to remove cabonate scale and rust deposits. This will open up the perforations and increase gas production.


The number of acid sticks to be used is based on the number of feet of perforated interval or open hole and severity of scale build-up. Field tests indicate the best results were achieved by using a large initial slug treatment (1.8 to 5.4 lbs of stick per foot of interval followed by smaller periodic treatments (about half the initial slug amount). Recommended usage is 2-6 of the 1 1/4 X 15” sticks per foot of interval. The most common procedure is to shut-in well and drop sticks through the lubricator and return well to injection. This procedure is best for open-hole, no rat-hole, low rate wells, or wells deeper than 3,300 feet. For shallow perforated wells with rat hole drop sticks and leave well shut-in about 15 minutes or until sticks fall into the perforations then return well to injection. The time in minutes for the sticks to fall to the perforations (assuming well is shut-in with fluid at surface) is equal to the depth of perforations divided by 110. (Time, Min = Depth,Ft/110).

Acid sticks can be introduced to the system through the water supply tank, however, dropping the sticks directly into a well is best because not as much dilution will occur. In a well with tubing obstructions or small valve openings, acid sticks can be successfully used by first dissolving the sticks in fresh water and then pumping or pouring the solution into the well.


Acid sticks are very economical (as compared to conventional scale removal operations) and can eliminate or delay the need for HCI acid treatments.

Continuous treatment with acid sticks (especially after a conventional acid or clean-out job) can extend the time period between future scale removal operations.

Acid sticks are safe and easy to use by less experienced field personnel. Acid sticks are safe to use in cement lined tubing and plastic lined pipe. Continued treatments over long periods of time through a by-pass feeder into cement lined pipe should be avoided.


The stick will normally dissolve in 30 to 90 minutes (in moving water or when falling through water) depending on temperature, salt content, and relative water motion.

Caution: As with all industrial chemicals contact with eyes or skin should be avoided. Wash thoroughly with water. Sticks should be stored in a cool, dry place.


Packaged 35 per box.