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CPT-B Combo Tool
The COMBO tool is used to make high-resolution pressure and temperature measurements in producing wells, and also provides digital wireline telemetry/power supply functions.
It includes a Platinum-Resistance sensor probe that samples the temperature of fluids flowing past the tool and a unique Silicon-on-Sapphire strain-gauge pressure sensor, together with an electronics section that digitizes the sensor outputs with 20-bit accuracy, and transmits the data on high-speed digital telemetry up a monocable wireline.
The tool also interrogates up to 11 other compatible tools stacked below the Combo at a rate of 16 times per second. Each tool is programmed internally with a unique digital address, which can be changed easily if necessary. This allows multiple sensors of the same type to be combined for special applications.
The graph below shows typical pressure measurement accuracy of the Combo Tool. The accuracy specification of our Dead-Weight tester is +/- 5 PSI. The accuracy is similar to the performance of Quartz gauges, but with greater ruggedness and no thermal lag effects.
