高含水期大孔道渗流特征及定量描述方法

doi:10.11743/ogg20180421

Abstract

Abstract: The identification and quantitative description of large pore pathways are of great significance to improve the measures of oil recovery at high water cut stages.Since the large pore pathways,usually developed in unconsolidated sandstone oil reservoirs at high water cut stage under the long-term injected waterscouring,can cause ineffective water cycle,and compromise the effect of water injection on recovery enhancement.Thus the study analyzed the seepage characteristics of high-velocity non-Darcy flow in the large pore pathways,to set up diagnostic criteria for large pore pathways according to the standards used to identify the high-velocity non-Darcy flow,and established an oil reservoir simulation system based on permeability,which changes with the pore volume expansion during scouring through water injection.And a quantitative description of the large pore pathways was given.Finally,the Ng6³⁺⁴ development unit in the upper member of the west Gudong oilfield was selected for reservoir simulation to identify large pore pathways and to carry out the quantitative description of the pathways.The results show that the proportion of large pore pathways,mainly distributed around the injectors or between injectors and producers,is relatively small in the simulated reservoir.In conclusion,the diagnostic criteria of large pore pathways,taking into account of the injector-producer spacing,injection-production pressure difference and permeability,can be effectively applied to the oil reservoir simulation system and the resultant quantitative description of the large pore pathways is accurate.

Key words: high water cut stage, high-velocity non-Darcy flow, identification of large pore pathways, oil reservoir simulation, EOR, Gudong oilfield

CLC Number:

TE327

Wu Zhongwei, Cui Chuanzhi, Yang Yong, Huang Yingsong, Liu Zhihong. Seepage characteristics and quantitative description of large pore pathways at high water cut stage[J]. Oil & Gas Geology, 2018, 39(4): 839-844.

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Seepage characteristics and quantitative description of large pore pathways at high water cut stage

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