Field Test of the Integrated Computational Elements: A New Optical Sensor for Downhole Fluid Analysis
- Christopher Jones (Halliburton) | Li Gao (Halliburton) | David Perkins (Halliburton) | Dingding Chen (Halliburton) | Darren Gascook (Halliburton)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- SPWLA 54th Annual Logging Symposium, 22-26 June, New Orleans, Louisiana
- Publication Date
- Document Type
- Conference Paper
- 2013. held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors
- 1 in the last 30 days
- 189 since 2007
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Wireline formation testers with optical fluid analyzers for real-time downhole fluid analysis have been used for over a decade. These analyzers are based primarily on optical spectroscopic methods using either multichannel filter photometers or multichannel grating spectrometers. Consequently, of all available spectra from visible to near- and mid-infrared, only limited spectral data are used in those analyzers. Contrary to the band-limited photometer approach, multivariate analysis is a well-established tool in chemical analysis used to correlate physical or chemical properties with information spanning the entire optical spectrum of interest, thereby providing higher spectral resolution and more accurate results.
Based on multivariate analysis methods, a new optical sensor has been developed for real-time downhole fluid analysis for pump out formation test operations. At the core of the new optical sensor sets is a chemical-specific detector called the integrated computational element (ICE Core™). By optimizing the design of a multilayer optical element, ICE Core™ has spectral resolution of 16 cm-1 with broad band response from 400 to 5000 nm. Such high spectral resolution and wide bandwidth makes it possible to perform laboratory-grade optical analysis under downhole conditions. The detector response of ICE CoreTM can be mapped directly to the parameter space for producing robust predictions on fluid properties of interest. A wireline formation tester equipped with multiple ICE Core™ elements specifically designed to measure gas/oil ratio (GOR), C1, C2, C3, C4, and C5, has undergone a successful field test as part of a pump out test.
In this paper, the fundamental principle of ICE Core™ is introduced with descriptions of the design and validation processes. Comparisons are also shown between field and laboratory test results.
|File Size||2 MB||Number of Pages||10|