The permanent gauge system (TPG)
The TPG system is a set of components designed to allow service installation companies a High specification option for gauge components, without the expense of using intelligent gauge systems. The system uses the latest technology and has been designed to provide the most reliable and effective way of producing a permanently installed pressure and temperature sensor, at the bottom of an oil well.
System components include gauges, tubing based mounting mandrels, tubing collar based mounting mandrels,1/4 inch tubular cable, wellhead penetrators, and surface supplies and software.
Gauge design incorporates metal to metal seals, triple pressure barriers on the cable termination, Fully NACE compatible housings, full pressure test sleeve on cable termination and mandrel mounting. Rotating mandrel mount allows gauge to be attached ot the mandrel with the cable already terminated.
The gauges will measure up to 20,000 psia, and 200 °C and can be mounted up to 40,000 feet away from the surface interface using a mono conductor cable.
Surface equipment is very simple and is a DIN rail mounted unit
The surface unit is connected up using either a direct RS232 serial link or an RS485 multi-drop data connection. Data and control is implemented with a Modbus protocol
Downhole gauge Data Sheet TPG gauge types Standard Gauge specifications
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Operating temperature 177°C
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Maximum operating temperature 220°C
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Dimensions Quartz 1 or ¾ inch OD and 22 inches length
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Test sleeve (option) 3.5 inch OD and 1 inch length
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Temperature Range 0-200 or to suit gauges operating
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Accuracy 1 °C
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Resolution 0.01 °C
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Pressure Range 5, 7.5 and 10.0, 16, 20 Kpsia (user choice)
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Over pressure >1.2 working pressure
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Accuracy Quartz 0.03% FS
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Resolution to 0.01 psi
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Wetted materials 17-4ph and Inconel 625 bellows
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Possible readings update rate 0.3 second per reading
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Cable drive 1,000 ohms (40,000 ft approx)
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Gauge power Voltage 7.5 to 25 volts
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Current 13 mA
Standard options for downhole gauges
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Extend temperature of calibration and operation to 200 °C
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Have all wetted metal parts made in Inconel 625
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E-beam welded housing
Shipped condition of gauges
Up to 60-day burn-in data record for strain gauge types. Shipped with full accuracy data report, Calibration data plus 2 spot checks Also included 14-day drift test with figures for expected drift. Full test over temperature and pressure limits including cable drive limits Gauge final tested with surface interface shipped with final check list.
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