Optical Computing Devices for Downhole Fluid Analysis

The patent replaces traditional mechanical spectrometer instruments with an optical computing device that uses optical elements (such as integrated computational elements) to perform spectral analysis. This substitution of mechanical/electronic systems with optical systems provides both the measurement capability of spectrometers and the stability required for downhole conditions, as the optical elements are inherently more robust and less sensitive to environmental variations.

The patent merges the stability of filter photometers with the analytical capability of spectrometers by integrating computational elements into optical filters. The integrated computational elements (ICEs) combine multiple filtering functions with computational algorithms, allowing the device to maintain the stability of simple filters while achieving the sensitivity and selectivity of complex spectrometric analysis for measuring analytes in complex oil matrices.

The patent transitions from traditional inline sensors that occupy space within the fluid flow path to optical sensors where the active sensing elements are positioned in a different dimension - using optical fields that can penetrate or interact with fluid without requiring physical presence in the flow path. This allows for improved detection capability through larger or more complex optical elements without disrupting fluid flow or causing blockages.

The patent employs integrated computational elements that can be manufactured using cost-effective techniques such as photolithography and standard optical fabrication methods. These optical elements can be produced in large quantities at low cost, enabling widespread deployment of multiple sensors throughout the oil and gas infrastructure. The elements are designed to be functional rather than permanently durable, with the understanding that they can be replaced if needed, significantly reducing the overall system cost compared to traditional expensive sensors.