A METHOD AND APPARATUS FOR DOWNHOLE DETECTION OF CO2 AND H2S USING RESONATORS COATED WITH CO2 AND H2S SORBENTS

摘要

A formation fluid sample is exposed to a rigidly-supported semi-permeablemembrane such as silicone rubber to permit diffusion of gases and vapors fromthe formation fluid into a vacuum chamber, while at the same time, blockingthe passage of any liquids. The membrane-transmitted gas is analyzed in thevacuum chamber by a resonator that reacts with it. The resulting change inresonant frequency of the resonator indicates the presence of a gas thatreacts with it. An ion pump or sorbent is associated with the evacuatedchamber to maintain the vacuum. The ion pump or sorbent removes gases andvapors from the low-pressure chamber, which have diffused into it from thereservoir sample that is on the opposite (high-pressure) side of the semi-permeable membrane.