Apparatus and downhole tools for measuring hydrogen sulfide in downhole fluids
AssigneeBaker Hughes, A Ge Company, LLC
InventorsOthon Do Rego Monteiro, Devesh Kumar Agrawal, Sankaran Murugesan
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Abstract
A method of determining a concentration of hydrogen sulfide in a fluid comprises exposing a sensor to the fluid, the sensor comprising a pair of electrodes defining a gap therebetween and a sensing material bridging the gap between the electrodes, measuring a value of an electrical parameter of the sensor at an applied frequency of greater than about 10 kHz and a voltage of less than about 1.0 volt when the sensor is exposed to the fluid, and determining the concentration of hydrogen sulfide in the fluid based at least in part on the measured value of the electrical parameter. Related apparatuses and methods are also disclosed.
Claims20
An apparatus for determining a concentration of hydrogen sulfide in a liquid, the apparatus comprising:
- a carrier configured to be conveyed through a borehole penetrating an earth formation;
- a sensor disposed at the carrier and comprising a pair of electrodes, major surfaces of the electrodes of the pair of electrodes opposing each other and defining a gap therebetween, a sensing material bridging the gap between the electrodes, the sensing material comprising metallic nanoparticles effective to reversibly adsorb hydrogen sulfide in a liquid;
- and
- a processor coupled to the sensor and configured to determine a concentration of hydrogen sulfide in the liquid based on a measured value of an electrical parameter through the sensing material between the electrodes, the sensor configured to measure the electrical parameter under electrical stimulation at a frequency greater than about 100 kHz.
A downhole apparatus for determining a concentration of hydrogen sulfide in a liquid, the downhole apparatus comprising:
- a sensor, comprising:
- a first electrode having a major surface;
- a second electrode having a major surface opposing the major surface of the first electrode, the major surface of the second electrode substantially parallel with the major surface of the first electrode;
- and
- a sensing material comprising metallic nanoparticles between the first electrode and the second electrode;
- and
- a processing system in operable communication with the sensor, the processing system configured to determine a concentration of hydrogen sulfide in a liquid based on a value of an electrical parameter generated by the sensor.
A downhole tool, comprising:
- a carrier configured to extend through a formation;
- and
- a sensor coupled to the carrier, the sensor configured to determine a concentration of hydrogen sulfide in a liquid, the sensor comprising:
- a pair of electrodes, each electrode of the pair of electrodes having a major surface opposing a major surface of the other electrode of the pair of electrodes;
- and
- a sensing material between the pair of electrodes, the sensing material comprising metallic nanoparticles;
- and
- a processor in operable communication with the sensor, the processor configured to determine a concentration of hydrogen sulfide in the liquid from an output of the sensor while a voltage of less than about 500 millivolts is applied to the sensor.
Dependencies are inferred from the claim text.