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US 2007/0178595 A1Published application
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
Life of this patent
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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.
Claims30
An apparatus for high-temperature and high-pressure measurement of pH of a fluid, the apparatus comprising:
- a fluid sample chamber to receive a fluid sample at a measurement pressure in operable communication with a first pressure regulating means, wherein said first pressure regulating means is configured to ensure that the pressure does not drop below the measurement pressure;
- a dye chamber in fluid communication with the fluid sample chamber, and in operable communication with a second pressure regulating means, wherein said second pressure regulating means is configured to ensure that the pressure does not drop below the measurement pressure;
- a light source and a detector in optical communication with the interior of the fluid sample chamber;
- and
- a spectral analyzer, wherein the spectral analyzer is configured to analyze the optical density of a mixture of the fluid sample and dye.
2 more elements
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 and the water to a measurement pressure;
- d. measuring a spectrum of the water;
- e. displacing the water with the fluid sample, while ensuring that the 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;
- and
- h. measuring a spectrum of the dye solution and the fluid sample mixture.
6 more elements
An apparatus for high-temperature and high-pressure measurement of pH of a fluid, the apparatus comprising:
- a container capable of withstanding high-pressure and high-temperature;
- a light source and a detector in optical communication with the interior of the high-pressure, high-temperature container;
- a first pressure regulator having a first volume chamber in fluid communication with the high-pressure, high-temperature container, wherein the first pressure regulator is configured to ensure that the first volume chamber does not drop below a measurement pressure;
- a second pressure regulator having a second volume chamber in fluid communication with the high-pressure, high-temperature container, wherein the second pressure regulator is configured to ensure that the second volume chamber does not drop below said measurement pressure;
- a fluid sample container capable of withstanding high-pressure and high-temperature in fluid communication with the first volume chamber;
- a dye reservoir in fluid communication with the second volume chamber;
- and
- a spectral analyzer to receive data gathered by the detector wherein the spectral analyzer is configured to analyze the optical density of a mixture of a fluid sample and a dye.
5 more elements
A method of high temperature and high pressure measurement of 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;
- b. measuring the spectrum of the water;
- c. displacing at least a portion of the water with a fluid sample at measurement pressure, while ensuring that the pressure does not drop below the measurement pressure;
- d. measuring the spectrum of the fluid sample at measurement pressure;
- 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
- f. measuring the spectrum of the dye/fluid sample mixture at measurement pressure.
4 more elements
A method to obtain total alkalinity of a fluid sample comprising:
- a. inputting an acid-dye solution into a dye chamber;
- b. inputting water into a fluid sample chamber, wherein the fluid sample chamber is at a measurement pressure and temperature;
- c. measuring the spectrum of the water;
- d. displacing the water with a fluid sample, while maintaining measurement pressure;
- e. measuring the spectrum of fluid sample;
- f. inputting an amount of the acid-dye solution into the fluid sample chamber, while maintaining measurement pressure;
- g. measuring a spectrum of the dye solution and fluid sample mixture;
- h. determining the pH of the fluid sample;
- i. repeating (e), (f), (g), and (h) one or more times to develop a relationship between pH and acid-volume added to the fluid sample;
- and
- j. determining the alkalinity of the fluid sample from said relationship.
8 more elements
An apparatus for high temperature, high pressure measurement of pH of a fluid, the apparatus comprising:
- a flowline to receive a fluid sample in fluid communication with a process line, wherein the flowline is configured so that it may be isolated from the process line;
- a dye injector in fluid communication with the flowline, wherein the flowline, process line and dye injector are maintained at or above a measurement pressure;
- a light source located downstream of the dye injector and in optical communication with the interior of the flowline;
- and
- a spectral analyzer in communication with the detector.
2 more elements
Dependencies are inferred from the claim text.