SDC-I formation pressure and temperature tester while drilling can measure formation pressure, annulus pressure, and annulus temperature while drilling, and then transmit the measured data to the surface by drilling fluid pulse.

This tester has been applied in 14 wells in Daqing oil field and achieved good results.

The accurate data measured by this tester can calculate formation mobility, which provides an effective method for managed pressure drilling and geologic reservoir evaluation.

This paper analyzes the principles and structure of formation pressure and temperature tester while drilling, which can provide the first-hand information for similar tools.

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