Title: Study on application timing and solution performance optimisation of composite system after polymer flooding

Authors: Leiting Shi; Shijie Zhu; Xiaoqin Zhang; Yuchi Zhou; Zhongbin Ye

Addresses: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China ' State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Institute of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China ' Exploitation and Development Research Institute, Daqing Oilfield Company, Daqing, Heilongjiang 163000, China ' Oil and Gas Engineering Research Institute, Jilin Oil Field, Jilin, Song Yuan 138000, China ' State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Abstract: The appropriate application timing and application system of compound flooding can maximise the recovery after polymer flooding. Taking a polymer flooding heavy oil reservoir as an example, the application timing and solution performance of the composite system are analysed and studied, respectively. The results show that the application time of composite flooding should be at the end of the effective mobility control time of polymer flooding after the disappearance of polymer action. Increasing RRF can effectively prolong the effective flow control of polymer flooding. Among the solution properties of the composite system, the contribution of solution viscosity is relatively larger, accounting for 54.88%. After considering the effect of the complete polymer flooding control process (polymer flooding + subsequent water flooding = displacement of 0.44 PV), a composite system with a viscous system as the main component (100-200 mPaⷀs) and an appropriate interfacial tension reduction is further developed. [Received: August 7, 2020; Accepted: September 11, 2020]

Keywords: polymer flooding; mobility control; combination flooding; oil displacement effect; application timing.

DOI: 10.1504/IJOGCT.2021.118650

International Journal of Oil, Gas and Coal Technology, 2021 Vol.28 No.3, pp.287 - 305

Accepted: 11 Sep 2020
Published online: 30 Oct 2021 *

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