SmartPort is a low profile ¾″ fibre optic P/T gauge. Pressure is communicated via a small pressure port on the gauge body to SmartPort’s novel internal optical sensing mechanism where pressure and temperature measurements are made using two fibre Bragg grating sensors. Annulus pressure and temperature are simply measured by leaving the pressure port open to the wellbore. For formation pressure and temperature measurements, the low profile gauge can be deployed open hole behind the casing. For tubing pressure and temperature measurements, SmartPort can be attached to a gauge mandrel with the use of dual metal o-ring or c-ring seals. Pressure from alternative locations can be communicated to SmartPort via a tube which seals to the gauge at the mandrel interface.

Multiple SmartPorts can be multiplexed on a ¼″ downhole cable to which the gauges are sealed using pressure testable swaged connections. Optical connection between SmartPort gauges is made using our ¾″ SmartLink product. Up to 15 SmartPort gauges can be multiplexed on every 2 fibres. So, for instance, 30 gauges can be deployed using a 4 fibre main cable and one downhole ‘Y’ splitter.

For HT and/or HP application with increased stability, an HPHT SmartPort is under development. Contact us for further details.

  • HPHT fibre optic gauge
  • No downhole electronics
  • All metal sealing
  • Long life at extreme temperature
  • High multi-drop capability
  • Annulus, tubing or ported pressure configurations
  • Low profile ¾” design
  • Low cost

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Related FAQs

FAQ. Is the SmartPort compliant to API or any other standards?

SmartPort is constructed of Inconel 718 and fully compliant with NACE MR0175.

FAQ. How does the SmartPort connect and seal to a downhole fiber optic cable?

The SmartPort is designed to connect to a ¼” Ø metal tube using metal to metal swage seals. The seal is designed to be proof-tested via an external test port. Standard off the shelf Swagelok ferrules are used. The SmartPort is supplied as standard with a swage plug and ferrule set.

FAQ. Does the SmartPort pressure rating influence the selling price?

No, all pressure variants are the same price.

FAQ. Can the two fibres from the SmartPort be combined onto a single fibre?

Yes. Smart Fibres uses Wavelength Division Multiplexing (WDM) with each sensor having its own unique wavelength. The fibres can be combined onto a single fibre using a standard optical splitter/combiner. This can be done downhole or at surface.

FAQ. What is the warranty period for Smart Fibres' interrogators?

All of our fibre optic interrogators come with a standard one year warranty. This warranty can be increased on a year by year basis. Extended warranty is available at the time of initial purchase on request.

FAQ. Does Smart Fibres technology suffer the effects of hydrogen darkening in downhole applications?

No, Smart Fibres technology is based on measuring the frequency of the reflection from fibre Bragg grating sensors. When there is attenuation in an optical fibre (whether through hydrogen darkening, poor connectors, fibre bending or any other effect) there is no change in the frequency of the light that passes through it. That means the signal of the Smart Fibres technology is not affected. Indeed, Smart Fibres interrogators are designed to compensate for attenuation in the fibre by automatically applying gain of up to 27 dB, individually on the reflection of each FBG within the system. So, for a Smart Fibres system, as long as the light gets through the data quality is maintained.

Hydrogen darkening and other means of attenuation mainly affect distributed temperature and strain systems based on measuring the amplitude of Raman or Brillouin backscattered light. Here, any change in amplitude can have a significant impact in the measurement quality. A simple comparison is frequency modulation (FM) vs. amplitude modulation (AM) in radio communications.

FAQ. Can the SmartPort be used for sensing either tubing or annulus pressure?

Yes, for tubing pressure the SmartPort can be mounted onto a gauge carrier mandrel and the interface sealed with dual metal-to-metal C-ring seals. For Annulus pressure the SmartPort can be clamped to the tubing string using standard off the shelf clamping solutions or mounted in a mandrel with the pressure inlet port facing outwards.

FAQ. Is the SmartPort supplied with one or two fibres?

The SmartPort is supplied with two polyimide coated fibres; one for the pressure sensor and one for the temperature sensor.

FAQ. How do I calculate which wavelength to use for my FBGs to maximise the number of sensors on a particular channel?

Smart Fibres has created a wavelength budget calculation tool for FBG wavelength selection.

Please Email Us or call +44 1344 484111 with details of your application and we can help you create a wavelength budget.

FAQ. What fibre type is used in your systems?

Single mode fibre with a 9 µm core, 125 µm cladding, and a 155 µm Polyimide or 245 µm Acrylate coating. Optical Fibers with pure silica core, bend tolerant and small core e.g. 6/125 or 4/125, can also be used but with some optical power losses. Multi mode fibre cannot be used.

FAQ. Can we put different sensor types on the same fibre?

Yes, Smart Fibres’ WDM products allow the user to combine different sensors types, e.g. temperature, strain and vibration all on a single fibre.