| 摘要 |
A sensor for detecting hydrocarbons and in particular methane, comprises a catalyst for converting one or more species of gaseous hydrocarbon and a detector to detect a signal indicative of the conversion rate. Said detector may be electrochemical or optical. The catalyst may be immobilised on the surface of an electrode 21, embedded in a porous matrix, or dissolved in an electrolytic solution. Said catalyst may be a transition metal based compound, for example diiron Fe<IV>2O4 componds, Fe2(SO4)3 or tri copper compounds. Said electrode may be made from metal (such as steel, gold or platinum), titanium dioxide, carbon, or diamond doped with boron or nitrogen. Also disclosed is a downhole tool for deploying the said sensor in a wellbore. The sensor may be permanently installed in a wellbore. |
