Xinjiang Petroleum Geology ›› 2024, Vol. 45 ›› Issue (6): 725-734.doi: 10.7657/XJPG20240612

• APPLICATION OF TECHNOLOGY • Previous Articles     Next Articles

Establishment and Application of a New Mathematical Model of Oil/Water Relative Permeability: A Case Study of Low-Viscosity Reservoirs in Tuha Basin

GE Qibinga(), LIU Qianb, MA Jianhongb, GAO Wenjuna()   

  1. PetroChina Tuha Oilfield Company, a.Research Institute of Exploration & Development, b.Shanshan Oil Production Management District, Hami, Xinjiang 839009, China
  • Received:2024-03-21 Revised:2024-04-12 Online:2024-12-01 Published:2024-11-26

Abstract:

The low-viscosity reservoirs in the Tuha basin exhibit rapid decline of oil relatively permeability in the initial development stage and slower decline in the late development stage with high water-cut. This paper presents a new mathematical model of oil/water relative permeability. The new model simplifies the determination of parameters and offers a high fitting accuracy. It can describe the oil relative permeability curve and the convex water relative permeability curve, and also the common X-shaped oil/water two-phase relative permeability curve. For convenient application, the new model was configured with a corresponding water flooding analytical method, and then compared with the Gao’s simplified model of oil/water relative permeability. In this way, the linear relationship between the average water saturation of oil layer and the water saturation at the outlet end was further validated. By directly substituting this relationship into the fractional flow equation, a new generalized water cut variation pattern was derived. The actual application of this model shows good results, making it a valuable reference for similar reservoirs.

Key words: Tuha basin, low-viscosity reservoir, oil, water, relative permeability, Welge equation, water flooding analytical method, water flooding pattern

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