Surface Pressure Gauges / Data Acquisition Equipment

Connects Directly to capillary tubing!  image
Connects Directly to capillary tubing!

Surface Pressure Gauges / Data Acquisition Equipment Related Terms

Surface Pressure Gauges / Data Acquisition Equipment, DFIT, Frac Monitoring, Surface Pressure Transient Testing

The best equipment in the marketplace.

Standard Dual Quartz Transducers

The Quartz crystal that resides in the Quartzdyne transducer is the most perfectly elastic material known to man.  “Perfectly elastic” means that for a given stress (load), there will always be an identical strain (distortion).  Quartz crystal does not age or exhibit hysteresis.  In addition, the circuitry in the transducer and gauge that measures the quartz crystal response to pressure was designed to be insensitive to aging of the individual electric components that make up the measuring circuit.  There is no limit to how many pressure cycles the gauge and transducer can endure.  Also because the gauge is not exposed to elevated temperatures that can induce drift, there is virtually no requirement for re-calibration.

Connecting directly to the wellhead

For DFIT tests, experience tells us that the gauge should connect directly to the wellhead via a needle valve with proper screening for debris plugging, as opposed to connection via a length of capillary tubing common to other surface gauges in the marketplace.  Our experience shows that the capillary tubing introduces an unnecessary level of risk of data distortion due to temperature cycling or plugging (caused by debris or freezing) for DFIT or pre-frac, injection fall-off tests.  For PBU’s in gas or gas condensate wells where elevated flowing wellhead pressures exist, the use of the capillary tubing is still recommended.

Monitoring temperature readings

It is critical for any surface gauge to output corresponding temperature readings along with pressure and time so that pressure corrections can be made in response to temperature fluctuations. Make sure you receive a corresponding temperature file with your pressure file so that you can track potential pressure anomalies that might be caused by changing ambient temperatures. 

We always recommend the tenting and heating of the wellhead area during winter months to minimize the oscillation of ambient temperatures from day to night and to avoid freezing in winter conditions. In some extreme winter conditions the addition of a space heater to the area is suggested, but be sure you are not aiming the heat source directly at the equipment.

Other Key Advantages

  • LCD readout to verify functionality upon starting, memory availability, and battery voltage
  • No Software required for downloading data
  • Files are ASCII that can be easily transferred (drag & drop) to your desktop
  • Lithium battery option available for long term testing needs
  • No Capillary tubing installation on DFIT tests - reduces leakage, plugging, and ambient temperature interference, connects directly to a needle valve  (capillary tubing installation is optional). 
  • Class 1 Div. 1 rating
  • Can be password protected to prevent unauthorized downloading of data

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