Corrosion Inhibitor Sticks are water soluble or oil soluble sticks that contain a blend of Imidazolines which have excellent filming characteristics and low emulsion tendencies. This unique blend gives effective corrosion control for most oil field corrosion problems.
Corrosion Inhibitor Sticks are primarily used to control common corrosion problems found in producing oil and gas well systems. They can be used to treat hard to reach ‘dead’ areas such as the annulus space above the packer, rat-hole, or the bottom of water supply tanks.
Corrosion Inhibitor Sticks can provide corrosion control throughout the entire production system. Regular usage will help control corrosion at the point they begin – down-hole.
They are available in two different formulations (oil soluble and water dispersable) or (water soluble and oil dispersable). The oil soluble type is soluble in oil, condensate and wet gas and can slowly disperse inhibitor into the water phase. The water soluble type is soluble in water and can slowly disperse inhibitor into the oil phase.
Corrosion Inhibitor Sticks can effectively inhibit corrosion in wells that produce both water and distillate or oil phases. In this case, it may be desirable to treat the well with both types of sticks by first dropping water soluble sticks and allowing them to fall through the oil into the water, thus dissolving and releasing inhibitor in the water column). Then drop the oil soluble sticks which will “FLOAT” at where the oil and water contact thus slowly dissolving and releasing inhibitor in the oil column.
The sticks are economical when compared to conventional corrosion control operations and therefore save investment in pumps, drums of chemical, and equipment maintenance.
Corrosion Inhibitor Sticks may be used in wells with bottom hole temperatures (BHT) of up to 375 degrees Fahrenheit.
The number of Corrosion Inhibitor Sticks used is based on the volume of total fluid produced (oil or condensate plus water). Field experience indicates that for most corrosive environments the best results are achieved by using a larger initial slug treatment (80 PPM daily) until the problem is under control then reduce to smaller periodic treatments (40 PPM daily) thereafter. EXAMPLE: An initial slug treatment of 80 PPM would require 0.64 lbs of Corrosion Inhibitor Stick per 24 BBL (1000 gallons) of total fluid produced.
COR. INH. STICK SIZES
STICKS PER BBL
|SENIOR (1 5/8 ” x 18″)||1 per 58 bbls|
|JUNIOR (1 3/8 ” x 16 “)||1 per 40 bbls|
|JUNIOR (1 1/4″ x 15″)||1 per 29 bbls|
|THRIFTY (1″ x 15″)||1 per 18 bbls|
|MIDGET (5/8″ x 15″)||1 per 7 bbls|
NOTE: To successfully control any corrosion problem, the inhibitor insertion into the fluid stream must be constant. For intermittent treatment or extreme corrosive environments increase the number of sticks accordingly.
THE MOST COMMON PROCEDURE for producing wells is to shut-in well and drop sticks through lubricator. Leave well shut until sticks fall to the bottom. The time in minutes for the sticks to fall to the bottom (assuming well is shut-in with fluid at surface) is equal to the depth divided by 100. (Time, min. = Depth, ft / 100).
FOR WATER INJECTION SYSTEMS drop the sticks into the water supply tank to inhibit more of the system.
OIL SOLUBLE: The stick will dissolve in 20 to 120 minutes (in moving diesel) depending on temperature, salt content, and relative fluid motion. The stick will melt at 135 degrees Fahrenheit and the specific gravity is 0.95.
WATER SOLUBLE: The stick will dissolve in 12 to 24 hours (in 60,00 PPMmoving brine water) depending on temperature, salt content, and relative fluid motion. The stick will melt at 125 degrees Fahrenheit and the specific gravity is 1.10.