Laser Spectroscopy for Downhole Sensing of Gases and Fluids

摘要

A method for spectroscopic analysis of a fluid using electromagnetic radiation from lasers is provided. In one embodiment, the method includes sampling formation fluid within a well and determining formation fluid properties for the sampled formation fluid through downhole fluid analysis. Determining formation fluid properties for the sampled formation fluid can include using a spectrometer having a plurality of quantum cascade lasers to determine optical properties of the formation fluid and determining levels of multiple chemical species in the formation fluid using the determined optical properties of the formation fluid. Various other methods, systems and devices are also disclosed.

主权项

1. A method comprising:
sampling formation fluid within a well; and determining formation fluid properties for the sampled formation fluid through downhole fluid analysis, wherein determining formation fluid properties for the sampled formation fluid includes: using a spectrometer having a plurality of quantum cascade lasers to determine optical properties of the formation fluid; and determining levels of multiple chemical species in the formation fluid using the determined optical properties of the formation fluid; and wherein the formation fluid has a water content above 2.5% by volume, and determining levels of multiple chemical species in the formation fluid includes determining a level of carbon dioxide in the formation fluid having the water content above 2.5% by volume.