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Dual Shear Gun

Appropriate drilling fluid properties for optimal drilling progress with immediate stable viscous parameters during drilling
operations. Freshly sheard drilling fluid can be applied directly into the well operation when this shear gun is implemented on the
rig. Expected reduction in wellbore construction time due to avoiding fluid circulation in the well only to condition the drilling fluid.

To make and obtain a good oil based drilling fluid, a stable water-in-oil emulsion must be produced.  Creation of a stable emulsion require exposure to a sufficiently high mixing energy.  This mixing energy is usually provided by pumping through the drill bit or a shear unit. Most of today’s shear units to not provide sufficient shear to make this stabile emulsion and circulation through the drill bit is necessary. Shearing through the drill bit increases the drilling time of the wells and increase wear on topside and downhole equipment.

The most important property used to monitor Oil-based or Synthetic-based Invert-Emulsion Drilling Fluids is the electrical stability (ES). ES measure the needed electric potential to transmit a specified current through the ideally non-conduction fluid.  Thus, ES relates to the stability of the emulsion and capabilities to wet additives. There are many factors that can affect the degree of emulsification, such as suspended solids, viscosity profile, temperature, and pressure. 

In many cases large volumes of oil-based drilling fluids are mixed without proper and adequate shearing, causing the oil to separate and weight material settling (sagging).

High mixing energy is also needed to produce applicable water-based drilling fluids.  High mixing energy reduces appearance of undissolved polymer agglomerations (fisheyes).  By removal of fisheyes the water-based fluids become stable, and all drilling fluid properties can be optimized.

The Jagtech™ Dual Shear Gun is a combined shearing and mixing device that for oil or synthetic based fluids will assure maximum Electrical Stability and obtain a stabile emulsion with reduced sagging.  When the drilling fluid passes through the opposing high-pressure nozzles and collapse in the mixing chamber due to the sudden reduction in pressure, the droplets implode, generating dynamic shear and fine particle dispersion.  For water-based drilling fluids the same processes will disperse chemicals and remove fisheyes.


  • High pressure. Input pressure rated to 750 bar.​

  • Suitable for both oil- and water-based drilling fluid.​

  • Double capacity. Double nozzle, capacity varies based on pressure drop settings.​

  • Exchangeable pressure drop nozzles.

  • Standard drill bit nozzles (Smith-series)

  • Preset and defined pressure drop based on mud type and shear grade.​

  • Optional pressure reading from both inlet and outlet side of nozzle.​

  • Active temperature reading on fluid. ​

  • Pre-mixing chamber. Corse mixing in chamber before nozzle.​

  • Low noise. Integrated sound damper with wolfram carbide lining for low wear.​

  • Additional mixing inlet nozzles. 6x Ø10 inlet nozzles for additives for inline mixing.​

  • Fluid impact mixing. Drilling fluid jet collision mixing ​between nozzles.

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