Patent ID: 8519713
Filing Date: 2013-08-27
Classification: G01N

Abstract:
1. A method for downhole analysis of a fluid sample in a wellbore, comprising: collecting a sample of a fluid mixture at a downhole location; separating a hydrogen sulphide gas component from the sample of the fluid mixture and dissolving the separated gas component in a pH buffered nonsolid conductive material; providing a plurality of electrodes in contact with the nonsolid conductive material; using the plurality of electrodes to apply a potential across the conductive material and thereby directly oxidize or reduce the hydrogen sulphide gas component separated from the sample of the fluid mixture; measuring current flowing through the conductive material resulting from the direct oxidization or reduction of the hydrogen sulphide gas component; and determining a presence of the hydrogen sulphide gas component or an amount of the hydrogen sulphide gas component from the measured current.