Development and applications of ruggedized VIS/NIR spectrometer system for oilfield wellbores

Abstract

The development and applications of a ruggedized visible to near-infrared (VIS/NIR) spectrometer system capable of measuring fluid spectra in oilfield wellbores are presented. Real-time assessment of formation fluid properties penetrated by an oilfield wellbore is critically important for oilfield operating companies to make informed decisions to optimize the development plan of the well and hydrocarbon reservoir. A ruggedized VIS/NIR spectrometer was designed and built to measure and analyze hydrocarbon spectra reliably under the harsh conditions of the oilfield wellbore environment, including temperature up to 175 °C, pressure up to 170 MPa, and severe mechanical shocks and vibrations. The accuracy of hydrocarbon group composition analysis was compared well with gas chromatography results in the laboratory.

Keywords

VIS/NIR spectroscopy / hydrocarbon compositions / oilfield wellbore / in situ measurement / real time

References

[1] Brown C W. Trading wavelength for absorbance resolution: predicting the performance of array detection systems. Applied Spectroscopy, 1993, 47(5): 619-624.

[2] Mullins O C, Daigle T, Crowell C, Groenzin H, Joshi N B. Gas-oil ratio of live crude oils determined by near-infrared spectroscopy. Applied Spectroscopy, 2001, 55(2): 197-201.

[3] Agthoven M A v, Fujisawa G, Rabbito P, Mullins O C. Near-infrared spectral analysis of gas mixtures. Applied Spectroscopy, 2002, 56(5): 593-598.

[4] Fujisawa G, van Agthoven M A, Jenet F, Rabbito P A, Mullins O C. Near-infrared compositional analysis of gas and condensate reservoir fluids at elevated pressures and temperatures. Applied Spectroscopy, 2002, 56(12): 1615-1620.

[5] Smits A R, Fincher D V, Nishida K, Mullins O C, Schroeder R J, Yamate T. In-situ optical fluid analysis as an aid to wireline formation sampling. SPE Formation Evaluation, 1995, 10(2): 91-98.

[6] Creek J, Cribbs M, Dong C, Mullins O C, Elshahawi H, Hegeman P, . Downhole fluids laboratory. Oilfield Review, 2009, 21(4): 38-54.

[7] Mullins O C. The Physics of reservoir fluids: discovery through downhole fluid analysis, 2008, Sugar Land, Texas, U.S.A.: Schlumberger

[8] O. C. Mullins, J. Schroer, and G. F. Beck, “Real-time quantification of OBM filtrate contamination during openhole wireline sampling by optical spectroscopy,” presented at SPWLA 41st Annual Logging Symposium, SS, Houston, Texas, USA, June 4–7, 2000.

[9] Betancourt S, Fujisawa G, Mullins O C, Carnegie A, Dong C, Kurkjian A, . Analyzing hydrocarbons in the borehole. Oilfield Review, 2003, 15(3): 54-61.

[10] Raghuraman B, O’Keefe M, Eriksen K O, Tau L A, Vikane O, Gustavson G, . Real-time downhole pH measurement using optical spectroscopy. SPE Reservoir Evaluation & Engineering, 2007, 10(7): 302-311.