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Selective water shutoff for oil well
ZHAO Fu lin
(College of Petroleum Engineering in China University of Petroleum, Qingdao 266555, China)
Abstract:
For controlling water production from oil bearing formation, water shutoff methods with and without water detection were developed. Because water detection doesn 't need to be done and water production can be controlled in deep oil bearing formation, the latter method was more important and was reviewed here. In order to select water shutoff for oil well, the selective plugging agents and selective injection technologies were applied. The selective plugging agents and their action mechanisms were introduced, and how to utilize the characteristics of water production formation (high permeability, low flow resistance, high water saturation and easy to release pressure) and inject the plugging agent selectively into formation was analyzed. Some successful selective water shutoff pilot tests were given. This illustrates that water shutoff without water detection has a wide prospect of application and development.
Key words:  oil well  water shutoff  selective plugging