Experimental Study on Oil Removal in Nutshell Filters for Produced-Water Treatment
- Charles H. Rawlins (eProcess Technologies) | Farhad Sadeghi (National Oilwell Varco)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- February 2018
- Document Type
- Journal Paper
- 145 - 153
- 2018.Society of Petroleum Engineers
- Black Walnut Shell, Pecan Shell, Media Filter, Flux, Produced Water
- 6 in the last 30 days
- 265 since 2007
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Laboratory testing was conducted with a nutshell filter to determine the oil-removal performance on the basis of the flux rate, media type, media size, water salinity, and oil concentration. The goal was to determine the operating parameters that allowed <5 parts per million by volume (ppmv) of oil at the outlet, which is the normal operating point for this technology in produced-water treatment.
Nutshell filters composed of black walnut or pecan granular media are an established produced water-treatment technology for tertiary oil removal. Guidelines for the size and operation of nutshell filters have evolved mainly by trial and error, with limited published operating data. This laboratory-research program tested a nutshell filter to determine the operating flux limits (flow rate per unit area) that provide suitable oil-removal performance. The separation-efficiency target was defined as 5 ppmv of oil in the outlet stream. The variables tested included medium type [black walnut shell (BWS) or pecan shell (PS)], medium size, filtration flux, water salinity, and oil concentration. The flux limit for common 12/20 media is 12.0 (gal/min)/ft2 (or gpm/ft2) for freshwater operation and 13.0 gpm/ft2 for saline water. Decreasing the medium size to 20/30 mesh increased the allowable flux limit but at the expense of a substantial increase in the pressure drop. Oil-droplet penetration into the filter bed proceeds by means of a near-plug-flow profile, with the top 18 in. of the bed providing 99% of the oil removal. Full breakthrough is a function of inlet concentration, with 20–30 hours of operation expected for a 48-in.-deep bed.
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Blumenschein, C. D., Severing, K. W., and Boyle, E. 2001. Walnut Shell Filtration for Oil and Solids Removal From Steel Mill Recycle Systems. AISE Steel Technology 78 (4): 33–37.
Bradley, B. W. 1987. Two Oilfield Water Systems. Malabar, Florida USA: Robert E. Krieger Publishing Company.
Chin, R. W. 2007. Petroleum Engineering Handbook, Vol. III, Facilities and Construction Engineering, Chapter 2—Oil and Gas Separators. Richardson, Texas: SPE.
Evans, P. and Robinson, K. 1999. Produced Water Management—Reservoir and Facilities Engineering Aspects. Presented at the SPE Middle East Oil Show, Bahrain, 20–23 February. SPE-53254-MS. https://doi.org/10.2118/53254-MS.
Hensley, C. J. 1987. Filter Media for Filter Systems. US Patent No. 4,826,690.
Hensley, C. J. 1990. Filter Media for Filter Systems. US Patent No. 5,407,574.
Hensley, J. L. 1995. System and Method for Backwashing Multiple Filtration Vessels. US Patent No. 5,833,867.
Hirs, G. 1976a. Method of Filtering Oil From Liquids. US Patent No. 3,992,291.
Hirs, G. 1976b. Method and Apparatus for Rejuvenating a Bed of Granular Filter Medium. US Patent No. 3,953,333.
Hudson, H. E. 1981. Water Clarification Processes, Practical Design and Evaluation. New York, New York: Van Nostrand Reinhold Company.
Kenawy, F. A. and Kandil, M. E. 1998. Comparative Evaluation Between a Modified CFP Separator and All Other Available Oil-Water Separation Techniques. Presented at the SPE International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production, Caracas, 7–10 June. SPE-46817-MS. https://doi.org/10.2118/46817-MS.
Mantilla, I. and Quintero, P. 2000. Comprehensive System for Treatment and Injection of Produced Water: Field Case. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, 1–4 October. SPE-63169-MS. https://doi.org/10.2118/63169-MS.
Rahman, S. S. and Ezzal, A. M. 1988. Recent Advances in the Filtration of Oil Field Brines and Injection Waters. Presented at the 11th Annual Energy-Sources Technology Conference and Exhibition, New Orleans, 10–13 January.
Rahman, S. S. 1992. Evaluation of Filtering Efficiency of Walnut Granules as Deep-Bed Filter Media. Journal of Petroleum Science and Engineering 7 (3–4): 239–246. https://doi.org/10.1016/0920-4105(92)90021-R.
Rawlins, C. H. and Erickson, A. E. 2010. Characterization of Deep Bed Filter Media for Oil Removal From Produced Water. Presented at the Society of Mining, Metallurgy, and Exploration Annual Meeting and Exhibit, Phoenix, Arizona, USA. 28 February–3 March. Preprint 10-018.
Schlumberger. 2016. MYCELX RE-GEN Advanced Water Treatment Media. www.Slb.com/water-treatment.
Siemens Water Solutions. 2016. The Use of Walnut Shell Filtration With Enhanced Synthetic Media for the Reduction and/or Elimination of Upstream Produced Water Treatment Equipment. White paper at http://w3.siemens.com/markets/global/en/oil-gas/Pages/water-solutions.aspx.
Srinivasan, A. and Viraraghavan, T. 2008. Removal of Oil by Walnut Shell Media. Bioresource Technology 99 (17): 8217–8220. https://doi.org/10.1016/j.biortech.2008.03.072.
Tyrie, C. 2011. A Holistic Look at Media Filtration. Presented at the Produced Water Society Annual Seminar, Houston, January.
Xedia Process Solutions. 2016. Case Study: West Texas Produced Water Treatment for Reuse, Xedia XDN High-Performance Modified Nutshell Media. Press release at http://xediaprocess.com/projects/westtexas-nutshell-filter-optimization/.