Abstract
Composition and structural characteristics of floaters were detected and forming reasons were analysed through modern reservoir engineering theory, equipment analysis and physical simulation.Experiments on flowing characteristics, fluid diversion effect and driving effect were carried out. The results show that floaters are formed by huge amounts of tiny bubble absorbing crude oil and suspended solids in floating progress which make their density lower than water. Disposed floaters have better adaptability and can block off high-permeability. Furthermore, profile control effect turns better as particle concentration and permeability ratio increases. However,floater particles have selectivity to permeability ratio. When permeability ratio is not less than 8, profile control agent may damage low-permeability layers and cause succeeding water passing through high-permeability layers. Therefore, only when floaters adapt well to permeability ratio can we get better profile control effect.
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