A Study on the Method of Early Warning of Channeling in Polymer Flooding of Bohai Oilfield

doi:10.11885/j.issn.16745086.2016.01.08.02

Abstract

Abstract: The multi-layer recovery method is widely used in the Bohai Oilfield. The production wellbore is long, the heterogeneity in the vertical direction is strong, and the formation is loose. The channeling phenomenon occurs during the process of polymer flooding. In order to understand the development of channeling, a new early warning method for real-time identification and forecasting of polymer channeling is proposed. The proposed method is based on the dynamic characteristics of polymer flooding. and the results obtained are combined with those obtained from numerical simulations and theoretical calculations. First, the gray relational analysis method is used to construct an independent evaluation index system of polymer flooding channeling, and the boundaries and weights of each index are determined. Next, the fuzzy comprehensive evaluation method is used to establish an evaluation model of polymer channeling. Finally, through the combination of the gray prediction and support vector machine models, the dynamic development trend in the recovery process of each index in the polymer channeling evaluation index system is determined, which consequently provides an early warning of the occurrence of later channeling. The method is validated in the Bohai J oil field, and the prediction accuracy is 86%.

Key words: Bohai Oilfield, polymer flooding, channeling, warning

CLC Number:

TE345

LIANG Dan, TANG En'gao, KANG Xiaodong, XIE Xiaoqing, HE Chunbai. A Study on the Method of Early Warning of Channeling in Polymer Flooding of Bohai Oilfield[J]. 西南石油大学学报(自然科学版), 2017, 39(5): 113-119.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2016.01.08.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I5/113

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