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A study of fluid flow in sediments and the effect of tidal pumping

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Abstract

Offshore drilling and production operations can result in spills or leaks of hydrocarbons into seabed sediments, which can potentially contaminate these sediments with oil. If this oil later migrates to the water surface it has the potential for negative environmental impacts. For proper contingency planning and to avoid larger consequences in the environment, it is essential to understand mechanisms and rates for hydrocarbon migration from oil containing sediments to the water surface as well as how much will remain trapped in the sediments. It is believed that the amount of oil transported out of the sediment can be affected by tidal pumping, a common form of subterranean groundwater discharge (SGD). However, we could find no study experimentally investigating the phenomenon of fluid flow in subsea sediments containing oil and the effects of tidal pumping. This study presents an experimental investigation of tidal pumping to determine if it is a possible mechanism that may contribute to the appearance of an oil sheen on the ocean surface above a sediment bed containing oil. An experimental apparatus was constructed of clear PVC pipe allowing for oil migration to be monitored as it flowed out of a sand pack containing oil, while tidal pressure oscillations were applied in three different manners. The effect of tidal pumping was simulated via compression of air above the water (which simulated the increasing static head from tidal exchange). Experimental results show that sustained oil release occurred from all tests, and tests with oscillating pressure produced for longer periods of time. Furthermore, the experimental results showed that the oil migration rate was affected by grain size, oil saturation, and oscillation wave type. In all oscillating experiments the rate and ultimate recovery was less than the comparable static experiments. For the conditions studied, the experimental results indicate that with an oscillating pressure on top of a sand pack, movement of a non-replenishing source of oil is suppressed by pressure oscillation.

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Acknowledgments

A number of LSU employees and students aided in the design of the experimental apparatus and collection of experimental data. Major contributors including Chris Carver (LSU PERTT lab), Renato Coutinho, Eric Laurent, Catalina Posada, and Marcus Smith. Part of this paper was originally published by ASME and was presented at the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering held in Busan, South Korea, 19–24 June, 2016. The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0804-y.

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Authors and Affiliations

  1. Department of Petroleum Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA

    Paulo Waltrich, John Whitehead, Richard Hughes & Karsten Thompson

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  1. Paulo Waltrich
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  2. John Whitehead
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  3. Richard Hughes
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  4. Karsten Thompson
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Correspondence to Paulo Waltrich.

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Waltrich, P., Whitehead, J., Hughes, R. et al. A study of fluid flow in sediments and the effect of tidal pumping. J. Earth Sci. 28, 842–847 (2017). https://doi.org/10.1007/s12583-017-0804-y

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  • DOI: https://doi.org/10.1007/s12583-017-0804-y

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