2K7 Biocide For Hydraulic Fracturing Fluid Applications

The control of bacteria in reservoirs, wellbores and production systems continues to be a challenge in North America due to high fluid volume hydraulic fracturing. Introducing high volumes of foreign fluids into a new well that haven’t been evaluated for bacterial load and treated appropriately can initiate downhole biofilms that may never be fully eradicated throughout the life of the well.

These microbes can cause damage such as souring (H2S) of the formation or microbial influenced corrosion (MIC), which can be carried throughout an entire gathering system affecting system integrity.

Fracturing source fluids can be fresh water, produced water, flowback or a combination thereof. OSP’s 2K7 biocide is effective in a wide range of salinities and has a high tolerance for suspended solids, which can accumulate when recycling flowback. This makes 2K7 biocide particularly effective for hydraulic fracturing programs.

2K7 Biocide is effective in:

  • High salt and high hardness
  • High suspended solids
  • Anionic and cationic systems
  • Varying viscosities
  • Any water/oil ratio
  • Recycled fluids

2K7 Biocide will not:

  • Crosslink and polymerize friction reducers
  • Polymerize or destabilize lubricants and inhibitors
  • Sequester iron or generate insoluble sulfides
  • Alter fluid viscosities or rheology profiles
  • Film out on proppant

Simplified diagram of wellsite fracturing fluid flow and where to use OSP’s LifeCheck Test Kits and 2K7 biocide, as well as downstream applications.

2K7 Biocide Hydraulic Fracturing Treatment Program

Hydraulic FracturingAn effective biocide program for hydraulic fracturing takes into account bacterial growth conditions at surface to ensure fracturing system fluid stability, as well as downhole control for reservoir protection.

The OSP LifeCheck ATP Test Kit quantifies the initial bacteria load in source fluids in less than 10 minutes. Based on these results, and an understanding of the formation conditions, OSP can recommend a 2K7 biocide dosage to be applied. If fluids are pretreated, LifeCheck ATP can be used to confirm treatment effectiveness prior to water usage.

Once a dosage is determined, 2K7 biocide can be applied via Water Soluble Paks (WSP) into open top frac fluid holding tanks or as a liquid with 2K7 Solution on-the-fly during the fracturing operations.

Approximate 2K7 biocide hydraulic fracturing treatment equivalents

2K7 BiocideVolume of FluidTreatment Level (active biocide)
1 WSP (1 kg/2.2 lb)10 m3/63 bbl100 ppm
8 WSP (8 kg/17.6 lb)80 m3/500 bbl100 ppm
1 box WSP (25 kg/55 lb)250 m3/1,575 bbl100 ppm
1 Drum Solution (220 kg/485 lb)220 m3/1,385 bbl100 ppm
1 Tote Solution (1,115 kg/2,458 lb)1,115 m3/7,015 bbl100 ppm
To determine program effectiveness post-frac, or to make changes to subsequent application dosages as source fluids change, the LifeCheck ATP Test Kit can be used on-site for fast, effective bacterial load monitoring.

2K7 Solution

Effective in high volume applications where liquid handling equipment allows for plug and play

  • Pre Treat Tanks
  • Post Oxidizer Treatment
  • On the Fly at Blender or Chem Add
  • Topping up Buffer/Working Tanks
  • Fluid Transfer Control (Trucking, Pipeline, Lay Flat Hosing)
  • Fluid Staging – Tanks or Pits (Long Term Control)
  • Asset Layup or Cleaning
2K7 Bugsticks

Use in low water volume and limited (restricted) access applications

  • Pre Treat Tanks
  • Fluid Transfer Control (Trucking, Pipeline, Lay Flat Hosing)
  • Asset Layup or Cleaning
2K7 Water Soluble Paks

Avoids chemical contact 

  • Pre Treat Tanks 
  • Topping up Buffer/Working Tanks
  • Fluid Transfer Control (Trucking, Pipeline, Lay Flat Hosing)
  • Fluid Staging – Tanks and Pits (Long Term Control)
  • Asset Layup or Cleaning
Talk to our Experts

Wherever there is water there are microbes. Depending on the application, microbial contamination can lead to serious issues such as fouling, souring and corrosion. Contact our team of experts to learn more about our 2K7 Biocide delivery mechanisms and how our products can help you avoid downtime, safety issues and equipment failure.

Killing it in Completions

When asked about frac kill studies, Virginia Wornstaff, CTO, responded with some words of wisdom from her extensive experience. During frac operations, frac studies are often run for the duration – often a 48 hour test. Regularly, the waters are in the reservoir for a lot longer when taking into consideration the time before load waters are fully recovered. Also, the time between frac and production facility tie in can take weeks or even months. Based on this, the selected biocide will be challenged to maintain control for this extension in time. When working with clients who get random well souring in fields with consistent frac programs and treatments, we often see the difference is in the time between frac and production activities. This extension of time creates a little incubator full of warm, stagnant, nutrient-rich conditions. Now in charge of disrupting this reservoir Petri dish, the treatment program should be adjusted to compensate for the new performance demand. Completing a three-week study or a re-inoculation procedure allows for measurement of residual biocide effects after extended periods of time. With a goal of preventing long-term contamination of the reservoir, wellhead testing 30 days after your well comes on production is going to give you the best indication of success.

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