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Optimization and treatment of wastewater of crude oil desalting unit and prediction of scale formation

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Abstract

In this article, one of Iran’s southwest oil fields that produces 3200 barrels per day (bbl/d) of wastewater from oil and gas processing was investigated. Experimental analysis of oil reservoir water and desalting wastewater disposal of crude oil desalting unit was performed. First, water was treated with a reverse osmosis membrane. As a result, the purified water, with lower total dissolved solids (TDS) and pH, was a suitable candidate for injection into the adjacent wells of the crude oil desalting unit. The effectiveness and compatibility of this wastewater to the formation water of the oil field wells were simulated. Finally, we studied and identified the formation, the amount, and the type of mineral scale deposits. These are the most important problems during water injection into the wells. The analysis shows that the refined water from the reverse osmosis (RO) process was a suitable and low-cost economical option for injection in onshore and offshore fields, due to the low amount of salts, the concentration of susceptible ions in scaling formation, and the appropriate pH. This oil field, which is in the second half of life, requires enhanced oil recovery methods (EOR) for the maintenance of pressure and an increase in oil recovery.

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Authors and Affiliations

  1. Department of Petroleum Engineering, Faculty of Petroleum Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, Tehran, Iran

    Masoud Bijani & Ehsan Khamehchi

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  1. Masoud Bijani
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  2. Ehsan Khamehchi
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Correspondence to Ehsan Khamehchi.

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Bijani, M., Khamehchi, E. Optimization and treatment of wastewater of crude oil desalting unit and prediction of scale formation. Environ Sci Pollut Res 26, 25621–25640 (2019). https://doi.org/10.1007/s11356-019-05632-x

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