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US 7,402,424 B2Granted
Spectroscopic pH measurement at high-temperature and/or high-pressure
AssigneeSchlumberger Technology Corporation
InventorsBhavani Raghuraman, Moin Muhammad, Jinglin Gao, Craig Borman, Gale Gustavson, Philip Rabbito
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Abstract
Methods and apparatuses for high-temperature and high-pressure measurement of pH and/or alkalinity of a fluid is described.
Claims7
A method of high-temperature and high-pressure measurement of pH of a fluid, the method comprising:
- a. inputting an amount of dye solution into a dye chamber;
- b. inputting an amount of water into a fluid sample chamber;
- c. adjusting the pressure of the dye solution with a first pressure regulating means and adjusting the pressure of the water with a second pressure regulating means to a measurement pressure;
- d. measuring a spectrum of the water;
- e. displacing the water with a fluid sample, while ensuring that the second pressure does not drop below the measurement pressure;
- f. measuring a spectrum of the fluid sample;
- g. inputting a desired amount of the dye solution into the fluid sample chamber, while ensuring that the first pressure does not drop below the measurement pressure;
- and
- h. measuring a spectrum of the dye solution and the fluid sample mixture;
- i. determining the pH of the fluid sample using the measured spectrum.
7 more elements
A method of high temperature and high pressure measurement pH of a fluid, the method comprising:
- a. filling lines, pump cylinders, and a container capable of withstanding high temperature and high pressure with water at a measurement pressure and a measurement temperature, such that the container is in operable communication with at least one pressure regulating means and at least one temperature regulating means;
- b. measuring the spectrum of the water;
- c. displacing at least a portion of the water with a fluid sample at measurement pressure and temperature, while ensuring that the pressure does not drop below the measurement pressure and the temperature is maintained at the measurement temperature;
- d. measuring the spectrum of the fluid sample at measurement pressure and temperature;
- e. mixing a known amount of a dye solution with the fluid sample, while ensuring that the pressure does not drop below the measurement pressure and the temperature is maintained at the measurement temperature;
- and
- f. measuring the spectrum of the dye/fluid sample mixture at measurement pressure and temperature;
- g. determining the pH of the dye/fluid sample mixture from the spectrum of the dye/fluid sample mixture.
5 more elements
Dependencies are inferred from the claim text.