DOWNHOLE PRESSURE MEASUREMENT

摘要

An improved method for measuring pressure downhole which corrects for temperature variation down the borehole by inserting a fluid down a tube inserted in the borehole and measuring its pressure, adding the pressure due to the weight of fluid in the tube, measuring the temperature profile down the borehole by means of a thin metal tube which has a continuous optic fibre within it using e.g. time domain Reflectometry based on Raman scattering and correcting the pressure due to weight of fluid in the tube in accordance with the measured temperature profile.