Completion

SNF has a long history of supplying the Oil & Gas industry with polymers used for well completions and hydraulic fracturing :

  • Friction reducers
  • Guar Alternatives
  • Scale Inhibitors

‚ÄčPolymer drag reduction was discovered in 1948 by Toms who observed drag reduction of 30 to 40% upon adding 10 ppm of methyl-methacrylate to a turbulent flow of mono-chloro-benzene in a pipe. Many applications have been developed since then.  Drag reducing agents (DRA) are used in water injection wells, irrigation networks and municipal sewer systems to increase their capacities as well as in firefighting to extend the range of fire hoses and water spray.

There are thousands of publications and field results showing the benefits of DRA injection to reduce the pressure drop in pipe flow systems.

  • DRA reduces corrosion by up to 30%
  • Increase of injection rates and consequently increased oil production rates
  • Energy savings

 

DRAs are widely applied for hydraulic fracturing to produce shale oil and gas. Polyacrylamide is used throughout the fracing process to reduce the pressure drop in the surface piping and wellbore tubing to help increase the bottom hole pressure. The polymer is added in the range of 150-300 ppm depending on water and field characteristics and injection rates.

 

Selecting the right polymer

SNF produces a wide array of polymers in powder and emulsion form that can be applied in the majority of field conditions, including cationic, non-ionic or anionic polymer. Selection of the best polymer for a given field depends on temperature, water composition (salts, contaminants), and rock type.

SNF portfolio comprises:

 

Implementation

SNF manufactures a unique polymer dissolution unit called PowderFrac which is a self-contained and automated hydrating and dosing system designed for rapid hydration of polymer powder. It offers enhanced performance and cost-savings and has a greener footprint compared to traditional emulsion systems.

 

Guar Alternatives

Hydraulic fracturing of shale increases productivity by creating, connecting and propping deep fractures. Design of the fracturing fluid is key to the success. The main functions of the fracturing fluid are to open the fractures and transport the proppant along the length of the fractures.

Guar gum was one of the first polymers used as a viscosifier for fracturing fluids. It is well known for its ability to thicken ice cream however, there are significant price fluctuations and it has become more expensive as supplies have tightened around the world.

SNF produces a new range of synthetic polymers that can be substituted for guar in this application. The SNF concept is that one product can be used for drag reduction in both linear and crosslinked modes which reduces chemical handling and the associated logistics.

The main advantages of these products are the following:

  • Viscosity performance is better or comparable to guar gum in both linear and crosslinked systems
  • Products can be fine-tuned for high temperature applications
  • The viscosity can be broken with conventional oxidizers
  • Can be crosslinked with zirconium over a wide range of salinities and pH
  • Cleaner than guar, as shown by regain conductivity tests
  • Good friction reduction properties
  • Biocide not required to protect from polymer degradation

 

 

Scale Inhibitors

SNF produces a wide range of scale inhibitors to mitigate the damage caused by precipitation of minerals during the completion or production phases of oil and gas wells. These products can be tagged or non-tagged and supplied in powder or liquid form.

Product name

Form

Active content

Scales

Max temperature

Flosperse 2005 CHM Liquid

40-45%

Mud thinner < 100°C

Flosperse 3000

Liquid (or powder)

40-45%

Calcium carbonate

< 100°C

Flosperse 3018CS

Liquid (or powder)

40-45%

Phosphate and silica

< 150°C

Flosperse 3037 CS A50

Liquid

40-45%

Phosphate-Zinc

< 200°C

Flosperse 9037 CS A50

Liquid

40-45%

Phosphate, silica, zinc + iron oxides

< 250°C