Throughout the past decade, much discussion and debate have centered on geological sequestration of carbon dioxide (CO2). In order for sequestration to have a reasonably positive impact on atmospheric carbon levels, the anticipated volume of CO2 that would need to be injected is very large. The plume of injected CO2 could potentially extend for many kilometers from the injection well, and formation pressure could be elevated following extended injection of CO2.

In the past two years, there has been growing discussion of a new issue concerning withdrawal of water from formations that would receive injected CO2. The concept is that by removing water already residing in the receiving formations (referred to as "extracted water" to distinguish it from "oil and gas produced water"), the pressure gradients caused by injection could be reduced, and additional pore space could be freed up to sequester CO2.

Produced water is typically salty ground water. The potential extracted water is also salty ground water. Therefore, many of the same management practices may be applicable. This paper describes the probable composition of the extracted water, options for managing the extracted water that is removed from the formations, the pros and cons of those options, and some opportunities for beneficial use of the water.

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