Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 120-129.doi: 10.12108/yxyqc.20190314

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Physical properties variation of WXS reservoir after long-term water flooding

XIONG Shan, WANG Xuesheng, ZHANG Sui, ZHAO Tao, PANG Fei, GAO Lei   

  1. No.1 Oil Production Plant, PetroChina Changqing Oilfield Company, Yan'an 716000, Shaanxi, China
  • Received:2018-11-15 Revised:2018-12-26 Online:2019-05-21 Published:2019-05-06

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Abstract: After decades of waterflooding, WXS reservoir of Tuha Oilfield has entered a high water cut stage. The mineral composition and clay composition, and pore structure of the reservoir have been changed by longterm washing and soaking of the injected water, which causes the change of reservoir sensitivity. On the basis of analyzing the changes of rock mineral composition, clay composition, permeability and pore structure before and after long-term water injection by using test methods of X-ray diffraction, full rock quantitative analysis, core mercury intrusion, scanning electron microscope (SEM), reservoir sensitivity evaluation experiments were carried out for the cores of water-flooded layer and the cores of oil layer respectively. The results show that longterm water flooding can easily cause the decrease of clay mineral content and enhance the reservoir heterogeneity. After long-term water flooding, the reservoir sensitivity varies in different degrees, and the variation range varies with the sensitivity types and the layers. The later stage of water injection and reservoir reconstruction should be adjusted according to the different reservoir sensitivity of different layers to improve the development effect of oilfields.

Key words: water flooding, pore structure, reservoir sensitivity, clay composition, damage degree

CLC Number: 

  • TE343
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