S & B pellets are primarily recommended for use in water injection wells and producing wells to remove carbonate scale, rust deposits and lower injection pressure on injection wells. Injection pressure drops of several hundred PSI have been observed following S & B treatments. Some wells have gone on vaccum and taken water by gravity. Success also has been experienced in some oil and gas producing wells and water supply wells by increasing flow rates.
S & B pellets can be applied directly into the well or introduced to the water system through the water supply tank. In producing pumping wells the S & B pellets can be introduced through a slug pot connected to the casing and flushed down the annulus by adding produced fluids into the pot to wash the pellets down hole, provided there is no isolation packer down hole. Dropping the pellets directly into the well is best because not as much dilution of the material will occur. In wells with tubing obstructions or small valve openings, S & B may be successfully used by first dissolving the pellets in fresh water and then pumping or pouring the solution into the well.
S & B pellets are very economical (as compared to conventional scale removal operations) and can eliminate or delay the need for HCL acid treatments. Continuous treatment with S & B pellets (especially after a conventional acid or clean-out job) can extend the time period between future scale removal operations. S & B pellets are less corrosive to steel pipe than conventional liquid HCL acid jobs because most of the acid generated by the pellets are released down hole. Conventional liquid HCL acid reacts with the steel, rust, and scale inside the pipe all the way down the well. S & B pellets are corrosion inhibited and mildly corrosive to steel (like inhibited amidosulfonic acids).
S & B pellets are safe to handle and easy to use by less experienced field personnel, however like all acids, contact with eyes or skin should be avoided and MSDS Sheets should be reviewed for additional safe handling measures before handling any such material. S & B pellets for short periods of time are safe to use in cement lined tubing and plastic lined tubing. Continued treatments over long periods of time through a by-pass feeder into cement lined pipe should be avoided.
TREATMENT DETERMINATION & PROCEDURE FOR PRODUCTION OPERATIONS
S & B pellets dissolve slowly and releases the chemical into the system. The amount of pellets required is based on the volume of water to be treated, number of feet of perforated interval or open hole and severity of scale build up down hole and on the metal surfaces. Field tests indicate that the best results were achieved by using a larger initial slug treatment (1.8 to 5.4 lbs of pellets per foot of interval) followed by smaller periodic treatments of (.75 to 2.5 lbs. of pellets per foot of interval). A small application scoop is provided with each container of product sold.
It is often best to slug the system with the initial slug treatment and then periodically add the reduced treatment rate to maintain control of the problem.
A REACTIVE EQUIVALENCY of S & B pellets vs. HCL ACID RATIO was determined by field tests. These tests indicated the approximately 15 pounds of S & B pellets dropped in an injection well resulted in an equivalent pressure drop as did using 120 gallons of 15% HCL Acid. Liquid HCL acid looses strength by reacting on the steel, scale and rust inside of the pipe all the way down the well while the pellets release most of their acid down hole in the produced fluid and where the problem areas are most commonly encountered.
S & B pellets are a white to off-white pellet with a specific gravity of 1.20 - 1.25. This pellet will therefore fall quite readily in Heavy Brine.
Poly pail (40 lbs) and Fiber Drum (250 lbs).
Refer to MSDS sheets prior to using this product.
FOR INDUSTRIAL USE ONLY
As with all industrial chemicals, contact with eyes or skin should be avoided. Wash thoroughly with water. Pellets should be stored in a cool dry place. Always remove pellets from the container with the scoop provided while wearing rubber gloves to avoid skin contact. Goggles are advised.
DISCLAIMER OF LIABILITY
The information in this bulletin is believed to be accurate, however all recommendations are made without warranty since the conditions of use are beyond Select Industries, Inc. control. Select Industries, Inc. disclaims any liability in connection with the use of the information, and does not warrant against infringement by reason of the use of any of its products in combination with any other material or in any process.