As hydraulic fracturing activity ramps up in colder locations across the United States to meet growing energy demand, harsher temperatures and environmental conditions remain a challenge.
Providing the market with a cold-weather solution, Dow Microbial Control, a business unit of DowDuPont Specialty Products, has launched two new products within its AQUCAR™ Water Treatment Microbiocides portfolio: AQUCAR™ TN 250 LT Water Treatment Microbiocide and AQUCAR™ 7140 LT Water Treatment Microbiocide.
“Shale basins are dependent, in part, on their surrounding environment. As demand for oil increases in the Canada, Bakken and Marcellus Basins, so has the need for biocide products that can perform under extreme temperatures,” said Joe Ferrara, global industry leader for energy and water at DuPont Industrial Biosciences. “Our new biocides – winterised with methanol – help operators extend microbial control down to negative 40 degrees Fahrenheit, with a host of additional benefits.”
A Cost-Effective Formulation for Cold-Weather Regions
Engineered to meet the demands of cold climates, AQUCAR™ 7140 LT Water Treatment Microbiocide is highly effective in controlling problematic microorganisms across a variety of conditions. The glutaraldehyde-ADBAC blend is efficacious over a broad temperature and pH range, and resists freezing at temperatures as low as -40° Fahrenheit. Compatible with most fracturing fluid additives, the biocide is effective in controlling slime-forming and sulfate-reducing varieties of bacteria, and helps enhance operational sustainability.
“From topside to downhole, glutaraldehyde has proved to be one of the most versatile biocides available – efficacious in the preparation and decontamination hydraulic fracturing phases – with short-term effectiveness as a protective biocide. However, when combined with a quaternary ammonium, like ADBAC, its performance sees a noticeable increase in speed of kill,” said Ferrara. “AQUCAR 7140 LT’s synergistic combination is highly effective in controlling bacteria and is ideally-suited to meet the diverse demands of most oil and gas applications.”
AQUCAR™ 714 Water Treatment Microbiocide is an aqueous blend of glutaraldehyde and quaternary ammonium. It is especially effective in controlling slime-forming bacteria, sulfatereducing bacteria and algae in water cooling towers, air washers, pasteurizers, and other recirculating water systems.
The evaluation of antimicrobial compounds has traditionally relied on measurements of efficacy against free-floating (planktonic) microorganisms. However, attention in recent years has begun to focus on the effects of microorganisms which adhere to surfaces, giving rise to types of deposits known as biofouling. These deposits contain not only colonies of microorganisms, but also a combination of cellular by-products, entrained debris, and inorganic materials. Biofilms can cause significant energy losses in water distribution systems as a result of increased fluid frictional resistance. In heat transfer equipment, biofilms can decrease heat transfer efficiency. Microbial fouling can occur under both aerobic and anaerobic conditions and can accelerate corrosion of metals and deterioration processes in wood.
AQUCAR™ 714 Water Treatment Microbiocide has shown substantial effectiveness in controlling microorganisms in water-handling systems where fouling and/or microbially influenced corrosion present problems. This utility has been demonstrated in both aerobic systems, such as recirculating cooling towers, and anaerobic systems, where sulfatereducing bacteria cause corrosion. Combined field and laboratory data have substantiated the ability of AQUCAR 714 Water Treatment Microbiocide to both penetrate biofilms and destroy “protected” microbial cells. In addition to killing microorganisms, AQUCAR 714 Water Treatment Microbiocide appears to accelerate the erosion rate of cells from the biofilm. When fouled systems are effectively treated with AQUCAR 714 Water Treatment Microbiocide, biofilms are removed from the system. As a result, the systems operate more efficiently and corrosion rates are significantly reduced.
Used In:
- Water cooling towers
- Air washers
- Pasteurizers
- Other recirculating water systems
Advantages:
- Ability to remove established biofilm and inhibit regrowth
- Broad spectrum of activity – kills aerobic and anaerobic microorganisms and algae
- Chemically compatible with most common scale and corrosion inhibitors and dispersants
- Reduces populations of sessile microorganisms known to cause corrosion and reduce heat exchange efficiency
- Effective over a broad pH and temperature range
- Non-foaming and water-soluble
A Trusted Product for Efficient Well Completions
New AQUCAR™ TN 250 LT Water Treatment Microbiocide is an antimicrobial agent designed to control bacteria under reservoir conditions for months, and is winterised to minimise freezing at temperatures as low as -40° Fahrenheit. When co-dosed with glutaraldehyde or DBNPA, the solution provides excellent compatibility with high temperatures, high salinity, fracturing fluid additives and sub-surface rock matrix, and helps minimise and delay the impact of souring, microbial induced corrosion, biofouling and plugging. The product also helps reduce amounts of contaminated flowback and produced water.
Effective over a wide range of pH and temperature conditions, AQUCAR™ GA 25 Water Treatment Microbiocide is an aqueous solution of glutaraldehyde containing 25% active ingredient. It is well-suited for water flood injection water; drilling, completion, workover and fracturing fluids; produced waters; oil and gas transmission lines; gas storage wells and hydrocarbon storage facilities; production wells; paper mills and paper mill process water systems; and pigments and filler slurries for paper and paperboard.
Used In:
- Water flood injection water
- Drilling, completion, workover and fracturing fluids
- Produced waters
- Oil and gas transmission lines
- Gas storage wells and hydrocarbon storage facilities
- Production wells
- Paper mills and paper mill process water systems
- Pigments and filler slurries for paper and paperboard
- Water-based coatings
Advantages:
- Broad-spectrum microbiocide that kills bacteria, yeast and mold
- Extremely fast-acting
- Non-surface active and non-foaming
- Effective against aerobic and anaerobic microorganisms, including sulfate-reducing bacteria
Both microbial control products are approved for use by the US Environmental Protection Agency, with additional registrations underway.
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