Transport Model Implementation and Simulation of Microgel Processes for Conformance and Mobility Control Purposes

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• 作者：Juntai Shi ; Abdoljalil Varavei ; Chun Huh ; Mojdeh Delshad ; Kamy Sepehrnoori ; Xiangfang Li
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：November 17, 2011
• 年：2011
• 卷：25
• 期：11
• 页码：5063-5075
• 全文大小：970K
• 年卷期：v.25,no.11(November 17, 2011)
• ISSN：1520-5029

文摘

Various forms of microgels, which are soft and flexible micrometer-scale globules consisting of water-soluble polymer networks, are available for near-wellbore conformance control and deep-penetrating mobility control purposes. Due to various descriptions of the nature and applicability of different microgel systems and conflicting reports regarding their effectiveness, a critical literature review is first performed on the characterization and efficacy of the colloidal dispersion gel (CDG), the preformed particle gel (PPG), the relative permeability-modifying microgel, and the temperature-sensitive and pH-sensitive microgels. We then present an implementation of a model for microgel transport and retention in our 3-D chemical-flooding simulator. In addition, preliminary simulation results on the effectiveness of the CDG and PPG hydrogels are presented. The effectiveness of various microgel systems can be quantitatively tested using the reservoir simulator with the microgel transport and retention model. A mechanistic microgel-trapping model in reservoir rock that depends on pore size distribution has also been developed and implemented in our in-house simulator. In this model, microgel globules do not enter some of the smaller pores, which are bypassed by the preceding waterflood; instead, they are adsorbed on the surface of larger pores, or are hydrodynamically trapped at the throats of larger pores. The published coreflood data were matched to obtain the model parameters. We performed preliminary simulations and identified requirements for the CDG and PPG characteristics and process conditions that will aid in their effective use.