Study on displacement units for water flooded low-permeability oil reservoirs
Weiyao Zhu,
Yangwen Zhu,
Wengang Bu,
Youqi Wang,
Yunfeng Liu
Affiliations
Weiyao Zhu
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, China; Research and Development Center for the Sustainable Development of Continental Sandstone Mature Oilfield By National Energy Administration, Beijing, China; School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, China
Yangwen Zhu
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, China; Research and Development Center for the Sustainable Development of Continental Sandstone Mature Oilfield By National Energy Administration, Beijing, China
Wengang Bu
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, China; Corresponding author.
Youqi Wang
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, China; Research and Development Center for the Sustainable Development of Continental Sandstone Mature Oilfield By National Energy Administration, Beijing, China
Yunfeng Liu
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, China; Research and Development Center for the Sustainable Development of Continental Sandstone Mature Oilfield By National Energy Administration, Beijing, China
Understanding the reservoir feature changes is essential for optimizing oil exploitation throughout the development lifecycle. This paper proposed an analytical displacement unit method to character the features of water-flooded, low-permeability oil reservoirs. The method hinges the ratio of fluid flux to area and average water saturation, providing a fine description of reservoir dynamics. It has been implemented in a case study of a five-spot waterflooding scheme. The reservoir can be categorized into sixteen distinct unit types, each with specific attributes. This paper delves into the evolution of these displacement units and the key factors that influence their behavior. The findings provide insights into the degree of waterflooding and oil distribution following continuous waterflooding. Furthermore, the proposed method offers a valuable framework for analyzing the development of dominant water flow channels and exploiting the residual oil.
