A comprehensive study on huff-n-puff oil recovery in tight sedimentary tuff oil reservoirs
Shuai Li·Zhiguo Wang·Xiaolu Nie·Xinyuan Gao·Yubo Liu·Hai Huang·Junbin Chen·Bin Shen·Shenglai Yang·Ermeng Zhao
Huff-n-puff (HnP) is currently an important means to enhance the oil recovery of tight oil reservoirs. In this study, taking tight sedimentary tuff oil reservoirs in Santanghu Basin, China as an example, the oil production law, pore utilization characteristics, and influencing factors of water, N2, CO2, N2–water alternating, and CO2–water alternating HnP (WHP, NHP, CHP, NWAHP, CWAHP) are comprehensively studied. The results show that middle pores (MPs) are the main pore utilization interval for