Research on Degradation of Flocculating Stemming Contained Polymer and Clay Used for Profile Control

Wei Zhang; Shuang Yan Zhang; Deng Feng Ju; Hai Jun Yan; Guo Qing Fu; Fang Wang; Meng Xiang Gao; Wei Hua Cui

doi:10.4028/www.scientific.net/AMR.912-914.297

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Research on Degradation of Flocculating Stemming Contained Polymer and Clay Used for Profile Control

Abstract:

Since Menggulin reservoir fully been developed in1990, profile control technique is widely used for improving water swept volume. After multiple rounds and large-scales of polymer flooding by materials mixed with sol-gel and Yellow River clay, the formation damage such as depth blockage and stemming become more and more serious.According to statistics, in 2012 there are respectively 10 and 11 water injection wells happened with back flow of profile control agent and wells pressure higher than fracture pressure that without injection. The original reservoir permeability is good, and individual well production has the capacity of 40 to 50m³/d. Yet recently several oil wells almost have fewer even no liquid output due to the blockage and stemming. Estimated by a typical well group,the speed of sol-gel drive increased from 10 m/year to 50~60 m/year, and average water injection pressure were up to 16MPa which almost double original pressure while the only 2MPa pressure corresponding to oil wells. Hence, it show that the severe depth blockage of the formation exactly exit in Menggulin reservoir.