Purification of Oil Field Production Water for Beneficial Use

Abstract

A method for generating new water with attached water rights comprising identifying a source of production water and treating the water in appropriate ways to provide water appropriate for beneficial use such as agriculture, irrigation, industrial or municipal or potable applications. Appropriate permits are obtained to create the new water with attached water rights.

Description

[0001]This application claims priority pursuant to 35 U.S.C. § 120 to and is a continuation application of U.S. patent application Ser. No. 11 / 784,569 filed 6 Apr. 2007 (the '569 application), which claimed the benefit pursuant to 35 U.S.C. § 119(e) of U.S. provisional patent application No. 60 / 789,846 filed 6 Apr. 2006 (the '846 application). The '569 and '846 applications are each hereby incorporated by reference in their entirety as though fully set forth herein.I. FIELD OF THE INVENTION[0002]This invention relates to a system and method for simply and economically producing agricultural augmentation water or potable water from oil production water. In particular, the invention relates to a system and process for microfiltration of production water so that it can be used beneficially, rather than being reinjected into the geological formation.II. BACKGROUND OF THE INVENTION[0003]Current water demands have prompted the investigation of alternative water sources and ways to augment...

AI Technical Summary

Benefits of technology

[0025]Alternatively the discharge from the ceramic microfilter can be further treated by activated carbon adsorption, reverse osmosis and/or ion exchange treat

Problems solved by technology

Indeed, it was a difficult and expensive task just to make production water suitable for disposal.

In addition, re-injection is costly because it requires substantial pressure (and, therefore energy) to overcome the resistance within the geological formation.

In addition, re-injection of production water into the formation dilutes subsequently-produced oil, adding additional costs to the recovery and processing of those hydrocarbons.

Nevertheless, prior to the present invention, re-injection was the most straightforward method to dispose of production water, since it was quite difficult and costly to clean the production water sufficiently for direct discharge.

Production water contains both inorganic and organic constituents that limit the discharge options available to the producer.

Otherwise, a downstream user with senior water rights could be damaged because he might not have enough water for his purpose.

Prior art methods of cleaning and upgrading production water have been ineffective and / or overly expensive.

Thus, the method is useful in recovering incremental amounts of oil from the production water, but is ineffective in removing other contaminants from the production water.Precipitation: Precipitation is used for the removal of both dissolved oils and heavy metals.

However, precipitation and filtration is still ineffective in removing volatile organic compounds, such as benzene.

However, this technology is very expensive, and it does not normally remove heavy metals.Nano Filtration: Nano filtration has been used for the removal of sulfate ions in the field and has been shown to be very effective.

However, they are very expensive and work on a limited number of metal ions.SMZ Removal—Application of “surfactant modified zeolites” is also a technique utilized on produced waters for the removal of benzene, toluene, ethylbenzene, and xylene, i.e., “BTEX,” and other volatile organics.

This technology does not remove heavy metals, unless they are associated with the organics being removed.

These prior art processes are all limited to certain aspects of cleaning up production water and do not present a comprehensive solution for upgrading production water to agricultural grade or potable water.

Methods that have attempted to achieve that result comprise expensive multiple step processes that sequentially and separately attempt to address each problem in cleaning up production water.

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