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Early-warning and differentiated adjustment methods for channeling in oil reservoirs at ultra-high water cut stage
JIANG Han-qiao
(College of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)
Abstract:
Channels with very high permeability can be developed in oil reservoirs at ultra-high water cut stage. In this study, different types of channeling problems were identified and described according to the geological characteristics of the reservoir and the dynamics of channel forming. An early warning and discriminating model for the detection of channeling was proposed based on the theory of early warning and the principles of reservoir engineering. The model can be used to identify various channels and their distribution in the reservoir, and the channels are differentiated as severely, normally and less-developed according to their flow conductivities. Water shut-off and conformance control methods were proposed for different types of the channels and their performance and application conditions were assessed using a numerical simulation model. The results show that,after the water shut-off or conformance control treatments, the selection of the subsequent or alternative flooding mode is very important to enhance the effectiveness of the channel blockage and control technique. Finally, a differentiated and fine adjustment strategy for controlling the channeling problems was proposed, which can be used for mature oil reservoirs at ultra-high water cut stage.
Key words:  reservoir  channeling  early-warning method  differentiated adjustment