Xiaoguang Wang1,2, Dehua Liu1,2,*, Zhenping Liu3, Zhen Luo3, Guihua Yang1,2, Zongfa Li1,2, Lijuan Huang1,2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.22, No.7, 2026, DOI:10.32604/fdmp.2026.079864
- 31 July 2026
Abstract Low-permeability conglomerate reservoirs are characterized by complex pore structures and poor sweep efficiency, making the optimization of carbon dioxide-water alternating gas (CO2-WAG) injection critical for enhanced oil recovery. To evaluate the displacement performance of CO2-WAG and determine the lower limit of effectively swept pore throats, this study presents long-core flooding experiments conducted on cores from the KS Formation of the B Oilfield in the Junggar Basin under reservoir conditions (20.1 MPa and 58°C). Continuous CO2 flooding and CO2-WAG schemes with varying cycle numbers and gas-water ratios (GWRs) were systematically compared. In situ online nuclear magnetic resonance (NMR) monitoring… More >